• DAY3SVR: Nws Storm Prediction Center Norman Ok

    From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Fri Jun 26 07:28:51 2026
    ACUS03 KWNS 260728
    SWODY3
    SPC AC 260727

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0227 AM CDT Fri Jun 26 2026

    Valid 281200Z - 291200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM EASTERN NORTH
    DAKOTA INTO NORTHERN MINNESOTA AND NORTHWEST WISCONSIN...

    ...SUMMARY...
    Severe thunderstorms are possible from the northern Plains into
    parts of the Upper Midwest on Sunday. Large hail and severe winds
    are the primary hazards.

    ...Eastern North Dakota into Minnesota...
    Some convection is expected to be ongoing during the early morning
    in eastern North Dakota. Given the time of day, it is not clear how
    intense this activity will be, but some risk for damaging
    winds/large hail may exist. With time, a plume of rich surface
    moisture and steep mid-level lapse rates will lift northward as the
    upper ridge builds in the Midwest. The morning activity may be able
    to intensify as is moves into northern Minnesota/northern Wisconsin.
    While there remains some uncertainty in the exact evolution, the
    Slight Risk has been shifted eastward to account for this potential.

    ...Northern Plains...
    Convection is possible during the late evening as another shortwave
    pivots into the High Plains and a surface low deepens in the lee of
    the Rockies. The position of this shortwave is not certain. The
    ECMWF shows the surface low developing in the central High Plains
    while the NAM suggest this will occur farther north into
    Nebraska/South Dakota. In either case, steep mid-level lapse rates,
    strong deep-layer winds, and adequate buoyancy will support a risk
    of large hail and isolated severe gusts during late evening into
    parts of the overnight.

    ...Midwest into Tennessee Valley Vicinity...
    Models suggest potential for an MCV to move southeastward through
    the day. The position of this feature varies substantially between
    models, however, and it will depend on if/how much convection
    develops late Saturday night. Marginal severe probabilities may be
    needed if confidence on the location of the MCV increases.

    ..Wendt.. 06/26/2026

    $$

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  • From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Fri Jun 26 19:17:26 2026
    ACUS03 KWNS 261917
    SWODY3
    SPC AC 261916

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0216 PM CDT Fri Jun 26 2026

    Valid 281200Z - 291200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
    NORTH DAKOTA AND THE UPPER MIDWEST...

    ...SUMMARY...
    Severe thunderstorms are possible from the northern Plains into
    parts of the Upper Midwest on Sunday. Large hail and severe winds
    are the primary hazards.

    ...Synopsis...

    The western U.S. upper trough will deepen and persist over that
    region on Sunday. Meanwhile, upper ridging will intensify over the
    Midwest into the South, while a shortwave upper trough moves from
    the Ohio Valley to the southern Mid-Atlantic region. At the surface,
    some uncertainty persists with regards to the location of lee
    surface low development in the central or northern Plains. The NAM
    appears to be an outlier compared to the ECMWF/GFS and the AI
    versions thereof. This will be important for where the best corridor
    of severe thunderstorm potential develops on Sunday
    afternoon/evening. Further east, a surface front will sag southward
    across the Upper OH Valley and portions of the Mid-Atlantic. Between
    these surface boundaries, a seasonally very moist airmass will exist
    across at least eastern portions of the Plains to the MS Valley and
    the southern Mid-Atlantic.

    ...Northern Plains/Upper Midwest vicinity...

    The forecast for Sunday is highly uncertain. Forecast guidance
    suggests a shortwave impulse and/or MCV will move across northern MN
    during the afternoon/evening. This area will be beneath the upper
    ridge axis and could be capped. However, a very moist airmass will
    be in place beneath steep midlevel lapse rates. Furthermore, a
    strong southerly low-level jet is expected to focus from the central
    Plains to the Upper MS Valley during the evening/nighttime hours. If
    storms can develop and become near-surface based, potential for
    damaging wind gusts and large hail will be possible. This scenario
    is generally supported by the RRFS and GSL MPAS, though
    location/timing varies.

    Forecast guidance develops additional areas of convection across
    portions of western NE/central SD into ND on the western periphery
    of stronger capping and near the surface trough/dryline within the
    gradient of stronger instability. This scenario is uncertain, both
    regarding storm development, and if storms occur, whether or not
    they will be surface-based. However, if storms do develop, an
    intense low-level jet within the strongly unstable airmass during
    the evening/overnight hours could support damaging wind potential.
    The Marginal risk (level 1 of 5) has been adjusted to reflect this
    conditional risk.

    ...Southern Mid-Atlantic...

    Forecast guidance suggests an MCV will move across the central
    Appalachians into parts of VA/NC on Sunday. Deep-layer flow is not
    expected to be particularly strong, but this feature could locally
    enhanced vertical shear, with some guidance showing effective shear
    magnitudes up to 25 kt are possible. A seasonally very moist airmass
    will reside east of the higher terrain across southeast VA into the
    eastern Carolinas, supporting moderate destabilization as strong
    daytime heating occurs. Thunderstorms will pose an isolated damaging
    wind risk into early evening.

    ..Leitman.. 06/26/2026

    $$

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  • From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Sat Jun 27 07:32:03 2026
    ACUS03 KWNS 270731
    SWODY3
    SPC AC 270730

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0230 AM CDT Sat Jun 27 2026

    Valid 291200Z - 301200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE
    MID-MISSOURI VALLEY INTO THE UPPER MIDWEST...

    ...SUMMARY...
    Severe thunderstorms are possible from parts of the central/northern
    Plains into the Upper Midwest on Monday. Large hail and severe winds
    are the primary concerns.

    ...Central/northern Plains into the Upper Midwest...
    A shortwave trough is expected to eject into the Dakotas and the
    Upper Midwest. The timing and evolution of this feature varies in
    model guidance. The ECMWF suggests a later and a more
    eastward-moving wave ejection as compared to the earlier, meridional
    trajectory of the NAM/GFS. These differences lead to drastic
    differences in where convection will ultimately form. The farther
    north solutions show little in the way of convection as compared to
    the ECMWF. A very moist airmass will be in place along with steep
    mid-level lapse rates overspreading the area. The amplified ridge in
    the East will remain in place and will suppress thunderstorm
    potential away from the trough/cold front. Models all suggest
    extreme buoyancy (4500+ J/kg MLCAPE) will develop within the warm
    sector. Deep-layer shear will be strong enough for organized storms.
    Given the potential for intense storms, a broad Slight will be
    maintained with the caveat that convective development is somewhat conditional/uncertain.

    ..Wendt.. 06/27/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Sat Jun 27 19:18:37 2026
    ACUS03 KWNS 271918
    SWODY3
    SPC AC 271917

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0217 PM CDT Sat Jun 27 2026

    Valid 291200Z - 301200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    THE NORTHERN AND CENTRAL PLAINS INTO THE UPPER MIDWEST...

    ...SUMMARY...
    Severe thunderstorms are possible from parts of the central/northern
    Plains into the Upper Midwest on Monday. Large hail and severe winds
    are the primary concerns.

    ...Central/Northern Plains to Upper Midwest...

    The forecast for Monday remains uncertain with forecast guidance
    depicting a wide envelop for severe potential across portions of the
    Missouri Valley into the Upper Midwest.

    At the large scale, an upper ridge will persist from the central
    Gulf Coast northward to the Upper Great Lakes. Further west, a
    shortwave upper trough is forecast to eject from the central Rockies
    into Manitoba/western Ontario. This will bring a belt of enhanced
    mid/upper southwesterly flow across the northern Plains and Upper MS
    Valley. At the surface, low pressure or an MCV over the Dakotas will
    lift generally northeast while a trough/surface front extends
    southward across the eastern Dakotas. The evolution of these
    features is uncertain, with some guidance lifting the low and any
    accompany severe risk quickly northward into Canada early in the
    day. Other guidance is slower and further south, favoring a corridor
    of severe potential across the eastern Dakotas and MN during the
    day. While these details remain a question mark, a very moist
    airmass will be in place with strong to extreme instability
    forecast. Depending on mesoscale details, an all-hazards severe risk
    could develop - though damaging wind and large hail appear most
    likely at this time. Given uncertainty, outlook changes are modest
    with this update.

    ..Leitman.. 06/27/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Sun Jun 28 07:31:13 2026
    ACUS03 KWNS 280731
    SWODY3
    SPC AC 280730

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0230 AM CDT Sun Jun 28 2026

    Valid 301200Z - 011200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE CENTRAL
    HIGH PLAINS INTO THE UPPER MIDWEST...

    ...SUMMARY...
    Severe thunderstorms will be possible from parts of the central High
    Plains into the Upper Midwest on Tuesday.

    ...Upper Midwest...
    Though the primary shortwave trough will be lifting into Canada, a
    remnant cold front will be situated across parts of northern
    Wisconsin into Minnesota. Strong to extreme buoyancy will be present
    south of this boundary. A belt of moderate mid-level flow will
    promote 40-45 kt of effective shear within the warm sector.
    Mid-level ascent will generally be weak. Where convection can
    initiate on the mesoscale, damaging winds and large hail may occur.
    There is some potential that an MCS could develop given the
    substantial buoyancy, but it is not clear where the preferred
    corridor for that will be at this time.

    ...Northeast Colorado into southwest Nebraska...
    A modest shortwave trough will move into the central Rockies. A
    surface low is expected to develop in eastern Colorado. This will
    draw low-level moisture into parts of the High Plains. Given around
    40 kt of effective shear, supercells capable of large hail and
    severe gusts would be possible. Low-level shear will also be
    enhanced near the surface low and a tornado or two could also occur.

    ...Northeast...
    Given the upper-level pattern, strong convection could be occurring
    in Canada and move southeastward around the upper ridge. Depending
    on the timing/intensity of this potential activity, severe
    probabilities may be needed in future outlooks. Confidence remains
    low at this time, however.

    ..Wendt.. 06/28/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Sun Jun 28 19:10:47 2026
    ACUS03 KWNS 281910
    SWODY3
    SPC AC 281909

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0209 PM CDT Sun Jun 28 2026

    Valid 301200Z - 011200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE CENTRAL
    HIGH PLAINS TO THE UPPER GREAT LAKES...AND ACROSS PARTS OF THE
    NORTHEAST...

    ...SUMMARY...
    Severe thunderstorms will be possible from parts of the central High
    Plains into the Upper Midwest, and across parts of the Northeast on
    Tuesday.

    ...Mid-MO Valley to Upper Great Lakes...

    A compact upper low and attendant shortwave trough will be located
    over the Canadian Prairies into the Upper Midwest Tuesday morning.
    This system will progress east/northeast through the day. While
    large-scale ascent will increasing be focused north of the
    international border, stronger southwesterly deep-layer flow will
    persist for most of the day before weakening by evening. At the
    surface, a stalled surface front will be oriented from northeast MN
    into southeast SD/northern NE. Convection may be ongoing near this
    boundary somewhere in MN or perhaps northern WI/Michigan Upper
    Peninsula vicinity. A very moist airmass will be in place and strong
    to extreme instability is forecast through the day across portions
    of the region. If organized storms can develop, a risk for damaging
    winds and hail is possible - particularly if upscale development
    into a bowing segment occurs. Overall the forecast remains uncertain
    and any corridors of greater severe potential will be heavily
    influenced by remnant convection from the Day 2/Monday period and
    mesoscale impacts thereof.

    ...CO/KS/NE/SD...

    An upper shortwave impulse initially over the Great Basin early
    Tuesday will eject eastward across the central Rockies and into the
    adjacent High Plains during the evening/overnight hours. As this
    occurs, a lee surface low will develop. Increasing
    south/southeasterly low-level flow will transport modest boundary
    layer moisture north and west. Isolated storms may develop near the
    lee low and surface trough across eastern CO into western KS and
    northeastward across western NE into southern SD along the remnant
    cold front/effective warm front extending west to east near the
    NE/SD border. Damaging winds and hail are possible with this
    activity, though storm coverage and mesoscale details remain
    uncertain.

    ...Northeast...

    Most forecast guidance suggest storms will develop southeast across
    the region from Canada within a mid/upper-level northwesterly flow
    regime on the eastern periphery of an upper ridge. A very moist
    airmass will support a corridor of moderate to strong instability,
    though the north and eastward extent of stronger instability is
    uncertain. Forecast soundings indicated 25-35 kt effective shear
    magnitudes, and isolated supercells will be possible. If sufficient
    clustering or outflow consolidation occurs, a forward propagating
    band of storms also is possible. Damaging wind gusts will be the
    primary hazard, though isolated hail or even a tornado also will be
    possible depending on storm mode and evolution. If confidence
    increases in a corridor of greater severe potential higher
    probabilities may be needed in subsequent outlooks.

    ..Leitman.. 06/28/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Mon Jun 29 07:35:51 2026
    ACUS03 KWNS 290735
    SWODY3
    SPC AC 290734

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0234 AM CDT Mon Jun 29 2026

    Valid 011200Z - 021200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS WITHIN PARTS OF
    THE CENTRAL PLAINS INTO THE UPPER MIDWEST...AND PARTS OF THE
    NORTHEAST...

    ...SUMMARY...
    Isolated strong to severe storms will again be possible from the
    central Plains into the Upper Midwest as well the Northeast on
    Wednesday. Severe wind gusts and large hail are the main concerns.

    ...Synopsis...
    The upper-level pattern across the CONUS will not significantly
    change from Tuesday into Wednesday. A broad trough in the West will
    maintain modest to moderate mid-level flow across the Plains into
    the Upper Midwest. Some stronger mid-level flow is possible in the
    Upper Great Lakes vicinity due to the main synoptic trough displaced
    to the north in Canada. Moderate northwesterly winds aloft will
    persist in the Northeast as well. Strong to extreme buoyancy will
    develop during the afternoon from the Upper Midwest into the
    Northeast with a very moist airmass beneath the upper ridge.

    ...Central Plains into the Upper Midwest...
    A stalled surface boundary will may eventually make modest northward
    progress as a weak surface trough develops in the central/northern
    Plains. Models suggest convection will be ongoing early in the
    morning in the Nebraska/South Dakota vicinity. Given the strong
    low-level jet expected, it is not clear if this convection will
    weaken during the morning or continue eastward into an increasingly
    unstable airmass. Depending on how that early activity evolves,
    there is potential for another round of convection to develop along
    the boundary in the Upper Mississippi Valley. This may be aided by a
    subtle shortwave trough moving northeast. In either case, MCS
    development is possible with time. Damaging winds and isolated large
    hail are possible, though there may end up being a corridor of
    greater wind damage potential should an MCS develop. Greater severe probabilities may be needed as confidence increases.

    ...Northeast...
    Forcing for ascent will be more nebulous on Wednesday. Even so, the
    very unstable environment will promote a risk of strong/damaging
    downburst winds as well as isolated large hail. Given the
    uncertainty in storm coverage, only low severe probabilities have
    been added.

    ..Wendt.. 06/29/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Mon Jun 29 19:00:58 2026
    ACUS03 KWNS 291900
    SWODY3
    SPC AC 291900

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0200 PM CDT Mon Jun 29 2026

    Valid 011200Z - 021200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE CENTRAL
    PLAINS TO THE UPPER MIDWEST/GREAT LAKES...AND ACROSS THE
    NORTHEAST...

    ...SUMMARY...
    Isolated strong to severe storms will again be possible from the
    central Plains into the Upper Midwest as well the Northeast on
    Wednesday. Severe wind gusts and large hail are the main concerns.

    ...Synopsis...

    The overall synoptic pattern will not changes much from Day
    2/Tuesday into Day 3/Wednesday. The upper ridge over the eastern
    U.S. may shift slightly east while an upper trough persists over the
    West. A series of midlevel shortwave impulses will migrate across
    the northern Plains and Upper Midwest/Great Lakes vicinity. Enhanced
    mid/upper flow will persist from the Dakotas into the Great Lakes
    and over the Northeast.

    ...Upper Midwest/Great Lakes...

    A quasi-stationary boundary is forecast to extend from northern WI
    toward southeast SD Wednesday morning. This boundary may slowly lift
    northward during the afternoon. The evolution of this boundary will
    largely be influenced by morning convection that may be ongoing
    near/north of the boundary across parts of MN/WI at the beginning of
    the period. Given a very moist airmass, strong to extreme
    instability is forecast near and south of the boundary. Morning
    convection could weaken as it lifts north of the boundary, or it
    could intensify through the day as destabilization occurs, spreading
    east across the Upper Great Lakes. Another round of convection may
    develop during the late afternoon into the nighttime hours along the
    boundary as well. While convective evolution is uncertain, the
    thermodynamic and kinematic parameter space will support a risk for
    severe wind gusts and large hail. Enhanced low-level shear near the
    surface boundary could also result in a corridor of tornado
    potential. Higher severe probabilities will likely be needed in
    subsequent outlooks as mesoscale details and convective evolution
    become more clear and forecast confidence increases.

    ...Northeast...

    Large-scale ascent will not be as strong across the region on
    Wednesday, though forecast guidance does show a shortwave impulse or
    MCV moving across the area as it crosses the international border
    from Canada. A very moist and strongly unstable airmass will be in
    place and strengthening mid/upper northwesterly flow will support
    some organized severe risk. However, storm coverage remains
    uncertain. Strong downburst winds and isolated large hail will be
    possible. The wind risk could increase if sufficient storm
    coverage/interaction results in clustering/bowing segments, but this
    scenario is uncertain given a lack of stronger low-level jet. Trends
    will be monitored and higher severe probabilities may be needed in
    subsequent outlooks.

    ...Central High Plains...

    A surface trough will extend southward from western SD/NE into
    eastern CO/NM on Wednesday. Southerly low-level flow will maintain
    modest boundary layer moisture beneath steep midlevel lapse rates.
    Southerly flow through around 500 mb will be somewhat weak, though southwesterly flow increases substantially above that. This could be
    sufficient for weakly organized convection developing within upslope
    flow along the surface trough Wednesday afternoon/evening. Given
    weaker instability and more modest vertical shear compared to
    previous days, severe potential is more uncertain. However, strong
    outflow gusts still appear possible given a deeply mixed boundary
    layer and inverted-v sub-cloud thermodynamic profiles.

    ...Southeast...

    Isolated to scattered thunderstorms are likely to develop on the
    southern periphery of the upper anticyclone Wednesday afternoon. A
    very moist and strongly unstable airmass will be in place, but
    vertical shear appears a bit weaker compared to Day 2/Tuesday. Storm
    coverage is uncertain, but some risk for locally strong gusts may
    develop, especially if sufficient clustering can occur to promote
    forward propagation.

    ..Leitman.. 06/29/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Tue Jun 30 07:35:34 2026
    ACUS03 KWNS 300735
    SWODY3
    SPC AC 300734

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0234 AM CDT Tue Jun 30 2026

    Valid 021200Z - 031200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE BLACK
    HILLS VICINITY INTO PARTS OF THE MIDWEST...

    ...SUMMARY...
    Strong to severe storms will be possible from the northern Plains
    into the Midwest and Great Lakes regions on Thursday. Isolated
    strong to severe storms may also occur in the Tennessee
    Valley/Southeast as well as parts of the Northeast.

    ...Synopsis...
    Upper ridging will continue in the East with broad cyclonic flow in
    the West. Embedded shortwave troughs will likely impact the northern
    Plains. Another shortwave trough embedded within northwesterly flow
    aloft will move into parts of the Northeast. A stalled surface
    boundary will be present from the northern High Plains into the
    Upper Midwest with a lee trough/weak surface low developing in the
    High Plains.

    ...Black Hills into Iowa/Minnesota...
    A subtle shortwave trough is evident in model guidance. This feature
    will move into Wyoming/Montana and eventually the western Dakotas.
    Convection appears likely to develop within the higher terrain (Big
    Horns/Black Hills) and move into an airmass with increasingly rich
    low-level moisture to the east. Convection should be able to
    organize along the surface boundary with around 40 kt of effective
    shear parallel to the boundary itself. Additional convection is also
    possible along the stationary front as low-level warm advection
    increases. Though there is some variability in where any eventual
    MCS will propagate, there is enough confidence to include a 15%
    severe probability area that encompasses the envelope of potential
    tracks. The environment would support significant hail with
    supercells and significant winds with an organized MCS.

    ...Northeast...
    Ahead of a cold front attendant from a surface low in Quebec,
    convection will be possible during the afternoon. The timing of the
    convection, and thus the available buoyancy, is not entirely
    certain. Damaging wind gusts and large hail would be possible.

    ...Tennessee Valley into Southeast...
    A subtle easterly wave rotating around the upper anticyclone will
    promote afternoon convection within a very moist and unstable
    airmass. Given the mid-level lapse rates will fairly steep, storms
    will likely be capable of damaging downburst winds despite weak
    shear.

    ..Wendt.. 06/30/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Tue Jun 30 19:13:10 2026
    ACUS03 KWNS 301913
    SWODY3
    SPC AC 301911

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0211 PM CDT Tue Jun 30 2026

    Valid 021200Z - 031200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF
    THE NORTHERN PLAINS TO THE GREAT LAKES...

    ...SUMMARY...
    Strong to severe storms will be possible from the northern Plains
    into the Midwest and Great Lakes regions on Thursday. Isolated
    strong to severe storms may also occur in the Tennessee
    Valley/Southeast as well as parts of the Northeast.

    ...Northern High Plains to the Upper Midwest...

    Upper ridging will build over the northern Plains on Thursday,
    though temperatures aloft will remain fairly cool at around -12 to
    -10 C at 500 mb. A broad belt of enhanced west/southwesterly
    mid/upper-level flow will overspread the region, and a southerly
    low-level jet is forecast to intensify across the central into
    northern Plains overnight. At the surface, a quasi-stationary
    boundary will arc from northern North Dakota into central MN/WI
    during the afternoon. Meanwhile, a surface trough will extend
    southward along the High Plains. South/southeasterly low-level flow
    will maintain a very moist airmass across parts of the central
    Plains into the Upper Midwest, while transporting low 60s dewpoints
    northwest to near the ND/SD/MT/WY border. A broad swath of moderate
    to strong instability will materialize across the warm sector
    buffered by these two surface boundaries.

    Convection may be ongoing where from the Mid-MO Valley to Upper
    Midwest Thursday morning, though this is uncertain. Additional
    storms are expected during the afternoon along the surface
    boundaries across the northern High Plains southeastward into
    MN/IA/WI. Forecast soundings suggest supercell will be possible,
    with an accompanying all-hazards risk possible, at least initially.
    With time, convection in the High Plains should grow upscale and
    track southeast along the surface boundary and in the vicinity of
    the terminus of the increasing low-level jet. This activity will
    pose a risk of damaging wind swaths. Additional clustering/MCS
    development is possible near the surface boundary across MN/WI and
    perhaps into Lower MI during the evening/overnight.

    ...TN Valley Vicinity...

    Another modest midlevel shortwave impulse will likely migrate
    through easterly flow on the southern periphery of the upper ridge
    over the eastern U.S. A very moist and strongly unstable airmass
    will once again support a wet microburst risk, with some potential
    for sufficient clustering to result in forward propagating
    convection. Isolated to widely scattered damaging wind gusts are
    expected.

    ...Northeast...

    A weak cold front will approach the region Thursday night as a
    surface low over Quebec lifts northeast. Ahead of this feature a
    very moist, hot, and unstable airmass will be in place. Minor height
    falls throughout the day and increasing westerly flow aloft will
    support at least isolated thunderstorm development. Strong/locally
    damaging gusts and hail will be possible with the strongest storms.

    ..Leitman.. 06/30/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Wed Jul 1 07:34:43 2026
    ACUS03 KWNS 010734
    SWODY3
    SPC AC 010733

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0233 AM CDT Wed Jul 01 2026

    Valid 031200Z - 041200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS WITHIN SOUTHERN
    SOUTH DAKOTA INTO NORTHERN NEBRASKA...

    ...SUMMARY...
    Isolated to scattered severe storms are possible from the
    northern/central Plains into the Midwest and Mid-Atlantic on Friday.

    ...Synopsis...
    A complex forecast is evident on Friday. The upper-level trough in
    the West will lose some amplitude, though modest flow will remain
    across portions of the central/northern High Plains along with
    embedded shortwave troughs. The most complicating piece of the
    forecast will be the convection that is expected to be ongoing
    within the Midwest during the morning. The NAM/GFS is decidedly
    farther north than the ECMWF with this activity. The NAM has a
    strong enough MCS/MCV that it pushes the moist, unstable airmass
    farther south through the day whereas the ECMWF keeps a favorable
    airmass into the northern Plains. Given the large spatial extent of
    strong to severe storm potential, a broad marginal is in place from
    the northern Plains into the Midwest/Mid-Atlantic. Shear and
    mid-level lapse rates will be more favorable within the High Plains.
    A more targeted Slight Risk was added for southern South Dakota into
    Nebraska. Here, there will be potential for severe storms along the
    outflow from the expected MCS on Thursday. This area has been biased
    southward given the potential for storms being elevated atop outflow
    farther north. Some northward adjustment is possible if greater
    airmass recovery occurs. Another area where greater probabilities
    may be needed is in the Great Lakes region depending on the
    track/intensity of the MCV that moves eastward out of the Missouri
    Valley vicinity. Into the Ohio Valley and Mid-Atlantic, storm
    coverage will be more isolated and deep-layer shear much weaker.
    That said, a very unstable airmass could promote isolated damaging
    downburst winds.

    ..Wendt.. 07/01/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Wed Jul 1 19:32:20 2026
    ACUS03 KWNS 011932
    SWODY3
    SPC AC 011931

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0231 PM CDT Wed Jul 01 2026

    Valid 031200Z - 041200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    THE NORTHERN AND CENTRAL PLAINS INTO MIDWEST...

    ...SUMMARY...
    Isolated to scattered severe storms are possible from the
    northern/central Plains into the Midwest, Tennessee Valley, and
    Mid-Atlantic on Friday.

    ...Synopsis...

    One or multiple mid-level disturbances over the northern and central
    High Plains Friday morning are forecast to progress into the upper
    Midwest by Friday night. Meanwhile, a downstream belt of west to
    west-northwest flow will prevail in the mid levels from the Great
    Lakes into Northeast. At the surface, a lee cyclone and attending
    trough will exist over the northern High Plains with a secondary low
    pressure center over the central Plains. An outflow-modulated warm
    or stationary front is expected to extend from the northern Plains
    low into the upper Midwest. Elsewhere, there is some model signal
    for the development of a surface trough from southern New England
    into the Delmarva Friday afternoon.


    ...Northern and Central Plains into the Midwest and Upper Great
    Lakes...

    The potential for early-day storms introduces forecast uncertainty
    in subsequent afternoon/evening severe weather potential due to the
    location of relevant surface boundaries and extent of convective
    overturning. However, by afternoon, the models indicate the
    development of a broad corridor of moderate to strong instability
    across the northern and central Plains into the southern Great Lakes
    and OH Valley. Diurnally enhanced thunderstorm development is most
    probable from the vicinity of the northern Plains lee cyclone and
    trough east along the outflow-modulated front within a zone of
    forcing for ascent preceding the disturbances mentioned in the
    synopsis. The instability combined with modestly strong deep-layer
    shear will be supportive of organized storm modes capable of large
    to very large hail and damaging winds with the potential for
    significant gusts Friday afternoon into night.


    ...Mid-Atlantic...

    Increasing height falls are forecast Friday afternoon into night
    downstream from a more prominent short-wave trough progressing into
    eastern Ontario and southwest Quebec. The various 12Z models offer
    different scenarios in the preferred location of diurnally enhanced
    storms with the best overlap extending from portions of southern NY
    and northern PA to the Mid-Atlantic Coast. The colocation of
    moderate instability and modest deep-layer shear in that area may
    support some storm organization with the primary hazards being
    damaging winds and large hail.

    A similar environment is forecast across the region on Saturday,
    July 4th, potentially warranting the inclusion of higher severe
    weather probabilities.


    ...Ohio and Tennessee Valleys...

    A number of models indicate the potential for one or multiple MCSs
    to progress through the region during the forecast period. Vertical
    shear is expected to be relatively weak. However, the presence of
    moderate to strong instability may promote periods of cold-pool
    organization with a related damaging wind threat.

    ..Mead.. 07/01/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Thu Jul 2 07:30:56 2026
    ACUS03 KWNS 020730
    SWODY3
    SPC AC 020729

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0229 AM CDT Thu Jul 02 2026

    Valid 041200Z - 051200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS WITHIN PARTS OF
    THE MID-ATLANTIC...

    ...SUMMARY...
    Isolated to scattered storms will be possible from the central
    Plains into the Midwest and Mid-Atlantic this Fourth of July
    (Saturday). The greatest concentration of strong to severe storms
    will be within portions of the Mid-Atlantic.

    ...Mid-Atlantic...
    Strong heating of a very moist airmass will again support 3000+ J/kg
    MLCAPE by the afternoon. Despite weak shear, inverted-v low-level
    profiles will support strong to severe downburst winds that could
    produce wind damage. Given the presence of a cold front and surface
    trough as well as marginally greater forcing for ascent than Friday,
    storm coverage will be greater. A Slight Risk has been added where a
    few organizing clusters of storms may occur.

    ...Lower Great Lakes Vicinity...
    While there is still uncertainty, a shortwave trough/MCV is expected
    to move through Wisconsin/Minnesota. Convection may be ongoing in
    the morning, but some clearing/destabilization will be possible by
    the afternoon. Should this occur, a few strong to severe storms
    could produce wind damage and perhaps marginal hail. A tornado would
    also be possible given the backed surface winds in the vicinity of a
    weak surface low.

    ...Central High Plains...
    Moist air will remain behind an outflow/front composite boundary in
    the central Plains. This should promote around 40-45 kts of
    effective shear across the Front Range. Large hail and severe winds
    would be possible with supercells that develop.

    ...Central Plains into Ohio Valley...
    A broad area of 3000-4000 J/kg MLCAPE will develop south of the quasi-stationary boundary. Damaging wind gusts would be the likely
    concern with storms that develop. A greater wind threat could
    materialize if any clusters/MCS can develop.

    ..Wendt.. 07/02/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Thu Jul 2 19:21:30 2026
    ACUS03 KWNS 021921
    SWODY3
    SPC AC 021920

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0220 PM CDT Thu Jul 02 2026

    Valid 041200Z - 051200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM EASTERN
    COLORADO INTO WESTERN KANSAS...AND FROM EASTERN OHIO/WEST VIRGINIA
    EASTWARD ACROSS THE I-95 CORRIDOR...

    ...SUMMARY...
    Scattered storms will be possible from the central Plains into the
    Midwest and Mid-Atlantic this Fourth of July (Saturday). The
    greatest concentration of strong to severe storms will be within
    portions of the Mid-Atlantic, and over parts of the central Plains
    late.

    ...Parts of the Mid Atlantic...
    Stronger mid to high level winds exist over the Northeast, though 30
    kt at 500 mb will extend as far south as Maryland. A surface trough
    will deepen during the day near the I-90 corridor, where 70s F
    dewpoints will contribute to moderate instability. Storms may
    develop both within the instability plume from OH into PA, and
    within the heated surface trough from VA into PA/NJ. Strong wind
    gusts will be common, with some severe/damaging gusts likely late
    afternoon through early evening during peak heating.

    ...Central High Plains...
    Scattered strong to severe storms may develop near the Front Range
    as surface winds back to easterly late in the day. This will bring
    moisture westward toward the higher terrain, with most models
    showing a few cells developing late afternoon with localized hail
    and wind potential. Good direction shear and steep lapse rates aloft
    will favor large hail. Storms may then persist into western NE and
    KS, with potential areas of severe wind gusts.

    ..Jewell.. 07/02/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Fri Jul 3 07:33:39 2026
    ACUS03 KWNS 030733
    SWODY3
    SPC AC 030732

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0232 AM CDT Fri Jul 03 2026

    Valid 051200Z - 061200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS SUNDAY AFTERNOON
    INTO EVENING ACROSS THE MID ATLANTIC...

    ...SUMMARY...
    Developing thunderstorm clusters may pose a risk for damaging wind
    gusts across parts of the Mid Atlantic, and perhaps parts of the
    southern Great Plains, Sunday afternoon and evening.

    ...Discussion...
    The stronger mid-latitude westerlies likely will remain confined to
    the higher latitudes through this period. Within this regime, one
    initially notable short wave trough is forecast to gradually merge
    into a significant mid-level low digging through the Labrador Sea,
    as it accelerates away from the Canadian Maritimes and northern New
    England. Upstream, mid-level troughing may gradually consolidate
    across and east of the Canadian Prairies, and support modest surface cyclogenesis across northern Saskatchewan and Manitoba. However, it
    currently appears that stronger forcing for ascent, and potential
    for severe thunderstorm development, will remain focused to the
    north of the international border.

    To the south of this perturbation, models suggest that mid-level
    ridging, across the eastern Great Basin into north central Great
    Plains at the outset of the period, will expand eastward across the
    middle Missouri Valley toward upper Mississippi Valley Sunday
    through Sunday night. Downstream, weak troughing, with embedded
    convectively generated perturbations, will probably continue to
    overspread the middle Mississippi and Ohio Valleys.

    The focus for renewed thunderstorm development east of the southern
    Great Plains into the Ohio Valley, Cumberland and Allegheny Plateau
    remains unclear and will be considerably influenced by
    mesoscale/sub-synoptic developments with low predictability at this
    time frame. In general though, while at least pockets of large
    potential instability may conditionally support some risk for storms
    with potential to produce localized strong downbursts and gusty
    winds along outflows, weak shear will probably limit the potential
    for sustained organizing clusters. As such, the risk for severe
    winds may not be completely negligible, but it is not clear that it
    will reach the 5 percent threshold for an areal outlook.

    ...Mid Atlantic...
    There does appear a general consensus in model output that a
    low-level baroclinic zone may remain fairly well defined to the
    north through northeast of a surface low developing to the lee of
    the Blue Ridge by late Sunday afternoon. Near or just south of a
    residual belt of convectively augmented westerly
    lower/mid-tropospheric flow, the environment could become conducive
    to organizing thunderstorm development with potential to produce
    damaging wind gusts into Sunday evening.

    ...Raton Mesa/ridge into Texas South Plains...
    A bit less certain, guidance suggests that it is possible that a
    mid-level perturbation crossing the southern Rockies by Sunday
    evening could provide a support for another developing cluster of
    storms along a zone of differential surface heating. Moisture
    within the strengthening baroclinic zone may provide support for
    sizable mixed-layer CAPE, in the presence of modest shear due to
    veering of wind fields with height, to support organization
    accompanied by a period of strong to severe wind gusts into/through
    Sunday evening.

    ..Kerr.. 07/03/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Fri Jul 3 19:28:12 2026
    ACUS03 KWNS 031928
    SWODY3
    SPC AC 031927

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0227 PM CDT Fri Jul 03 2026

    Valid 051200Z - 061200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE
    MID ATLANTIC REGION...

    ...SUMMARY...
    Developing thunderstorm clusters may pose a risk for damaging wind
    gusts across parts of the Mid Atlantic and parts of the southern
    Great Plains Sunday afternoon and evening. Isolated severe storms
    may affect northern North Dakota late.

    ...Mid Atlantic States...
    Although wind fields aloft will weaken compared to the previous day
    as the upper trough lifts out of the Northeast, upper 60s to low 70s
    F dewpoints will remain over much of the region. Afternoon storms
    are likely to develop from PA southward across the Appalachians, and
    these will move eastward into a zone of strong heating/steep
    low-level lapse rates into MD/VA. Gusty winds are likely, some
    damaging through the evening.

    ...Northeast NM into northwest TX...
    East to southeast surface winds will prevail across the southern
    Plains on Sunday, which will aid westward moisture advection into
    NM. Shear will be weak, but southeastward-propagating clusters of
    storms appear likely late in the day and into the night as storms
    move into TX. Sporadic severe gusts may occur.

    ...Northern ND...
    A substantial upper trough will move into the Canadian Prairies late
    on Sunday, with the base of this trough sweeping across MT and ND
    overnight. A cold front will develop into far eastern MT and western
    ND late in the day, proceeding toward the Red River by Monday
    morning. Forecast soundings show moderate instability developing,
    with veering winds with height and hodographs favorable for
    slow-moving supercells. Aiding any such development into the night
    will be a nocturnal low-level jet. Isolated large hail appears most
    likely.

    ..Jewell.. 07/03/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Sat Jul 4 07:30:49 2026
    ACUS03 KWNS 040730
    SWODY3
    SPC AC 040729

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0229 AM CDT Sat Jul 04 2026

    Valid 061200Z - 071200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS MONDAY AFTERNOON
    AND EVENING ACROSS PARTS OF THE CENTRAL AND EASTERN DAKOTAS AND
    NORTHWESTERN MINNESOTA...

    ...SUMMARY...
    Strong thunderstorm development posing at least some risk for severe
    hail and wind is possible across parts of the central and eastern
    Dakotas into northwestern Minnesota Monday into Monday night.

    ...Discussion...
    Downstream of digging large-scale mid-level troughing and an
    associated surface cyclone slowly approaching the British Columbia
    and Pacific Northwest coast, ridging may become increasingly
    prominent across Baja California through the southern Rockies and
    central Great Plains during this period. Mid-level heights may tend
    to remain steady or slowly rise as far north as the eastern
    Montana/North Dakota international border, in the wake of a notable
    mid-level trough forecast to progress through northwestern Ontario
    and Hudson Bay by late Monday night.

    It appears that one vigorous impulse embedded within the troughing,
    and forecast to continue accelerating east-northeastward, to the
    north of the international border, may provide support for stronger
    secondary cyclogenesis near the northern Manitoba/Ontario border
    into southern Hudson Bay late Monday/Monday night.

    To the east of the mid-level ridging, weak mid-level troughing may
    continue to drift slowly east of the Mississippi Valley, toward the Appalachians.

    In association with this evolving regime, the potential for
    organized severe thunderstorm development appears generally low
    Monday through Monday night across most areas, with the possible
    exception of parts of the central/eastern Dakotas into northwestern
    Minnesota

    ...Northern Great Plains...
    Deeper surface troughing and mid-level height falls are forecast to
    pass to the north of the international border through this period.
    However, there appears at least some signal in model output that
    boundary-layer moisture return to the vicinity of weak pre-frontal
    surface troughing, coincident with southeastward suppression of
    warmer and more strongly capping elevated mixed-layer air, could
    allow for scattered strong thunderstorm development posing a risk
    for severe hail and wind across parts of the central/eastern Dakotas
    into northwestern Minnesota. Preceding the leading edge of the
    cooling in lower/mid-levels, it is possible that a zone of
    strengthening ascent associated with warm advection could support an
    upscale growing cluster, aided by updraft inflow of moderately
    unstable air. However, this remains more uncertain at this time.

    ..Kerr.. 07/04/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Sat Jul 4 18:56:21 2026
    ACUS03 KWNS 041856
    SWODY3
    SPC AC 041855

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0155 PM CDT Sat Jul 04 2026

    Valid 061200Z - 071200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    THE NORTHERN PLAINS INTO MINNESOTA...AND THE SOUTHERN
    MID-ATLANTIC...

    ...SUMMARY...
    Strong to severe thunderstorms are possible Monday afternoon and
    evening across portions of the southern Mid-Atlantic and the
    northern Plains.

    ...VA/NC vicinity...

    Upper troughing over the Midwest will continue to slowly shift east
    toward the Appalachians on Monday. Modest deep-layer southwesterly
    flow will overspread the central Appalachians to the Mid-Atlantic
    vicinity as a surface low develops in the vicinity of WV. A surface boundary/cold front will sag southward across PA while surface
    troughing develops in the lee of the VA/NC mountains. A very moist
    airmass will persist and moderate destabilization is forecast.
    Thunderstorm clusters will once again develop and pose a risk for
    sporadic wind damage Monday afternoon into early evening.

    ...Northern Plains into northwest MN...

    An upper shortwave trough will move east across the Canadian
    Prairies, glancing the U.S. northern Plains vicinity. This will
    bring a band of enhance mid/upper westerly flow across the region
    while a surface cold front develops southeast through the afternoon
    and nighttime hours. Southerly low-level flow will transport 60s
    dewpoints northward ahead of the front beneath modestly steep
    midlevel lapse rates. This will support moderate to strong
    destabilization. It is uncertain how far south convection may
    develop as large-scale ascent weakens into South Dakota and capping
    increases. However, supercell wind profiles are evident in forecast
    soundings, and where storms do develop, an accompanying risk for
    severe gusts and large hail is possible. An upgrade to Slight risk
    (level 2 of 5) may be needed in subsequent outlooks if confidence in
    storm coverage increases.

    ..Leitman.. 07/04/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Sun Jul 5 07:27:27 2026
    ACUS03 KWNS 050727
    SWODY3
    SPC AC 050726

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0226 AM CDT Sun Jul 05 2026

    Valid 071200Z - 081200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE TUESDAY
    THROUGH TUESDAY NIGHT ACROSS PARTS OF CENTRAL AND EASTERN SOUTH
    DAKOTA INTO SOUTHWESTERN MINNESOTA...

    ...SUMMARY...
    An organizing cluster of thunderstorms may pose increasing potential
    to produce strong to severe wind gusts by late Tuesday evening into
    Tuesday night across parts of the middle Missouri Valley toward the
    Upper Midwest.

    ...Discussion...
    Models suggest that the westerlies may become a bit less progressive
    across the higher latitudes of North America during this period,
    with a deep remnant lower/mid-tropospheric cyclone only slowly
    migrating east-northeastward across Hudson Bay toward the northern
    Quebec shores. Upstream, a notable trough is forecast to only
    slowly pivot inland of the British Columbia coast.

    In advance of the trailing perturbation, a low-amplitude trough
    within modest zonal westerlies across the northern tier of the U.S.
    is forecast to progress east of the northern Rockies, and flatten
    initial mid-level ridging across the middle Missouri Valley by late
    Tuesday night.

    Otherwise, mid-level ridging is forecast to remain prominent along
    an axis from the subtropical eastern Pacific through the central and
    southern Great Plains, while also developing northwestward from the
    subtropical western Atlantic into parts of the southeast. A remnant
    trough or shear axis will likely linger in between, near/west
    through southwest of the southern Appalachians.

    ...Parts of the middle Missouri Valley into Upper Midwest...
    Latest guidance suggests that potential for stronger convective
    development may still remain largely influenced by sub-synoptic
    developments with rather low predictability at this time frame.
    However, there appears a consistent enough developing convective
    signal among the various model output to lead to some confidence in
    the evolution of an organized convective system across the mid
    Missouri Valley vicinity by late Tuesday night.

    It appears that stronger pre-frontal daytime heating may focus
    moderate to strong destabilization in a corridor roughly across
    south central South Dakota toward southwestern Minnesota by late
    Tuesday afternoon. Beneath steep lapse rates, surface dew point
    increases to around 70F may support mixed-layer CAPE on the order of
    2000-3000+ J/kg.

    As remnant warm elevated mixed-layer air is suppressed further
    southward, the initiation of storms capable of producing severe
    hail and wind seems probable by early Tuesday evening. It is
    possible that the most substantive upscale growth, intensification
    and organization awaits forcing associated with a nocturnal
    strengthening low-level jet toward late evening. But, as this
    occurs, the environment appears potentially conducive to the
    development of a swath of damaging winds as it propagates
    east-southeastward Tuesday night.

    ..Kerr.. 07/05/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Sun Jul 5 19:31:01 2026
    ACUS03 KWNS 051930
    SWODY3
    SPC AC 051929

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0229 PM CDT Sun Jul 05 2026

    Valid 071200Z - 081200Z

    ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    CENTRAL AND EASTERN SOUTH DAKOTA INTO SOUTHWESTERN MINNESOTA...

    ...SUMMARY...
    Strong to severe thunderstorms will pose a risk for scattered
    damaging wind gusts and large hail on Tuesday across parts of the
    middle Missouri Valley toward the Upper Midwest.

    ...Northern/central Plains to the Upper Midwest...
    Along the northern periphery of an expansive upper ridge centered
    over the Southwest, a low-amplitude midlevel impulse will advance
    eastward across the northern Plains into the Midwest through the
    period. Related forcing for ascent will support multiple rounds of thunderstorms, generally focused along an ENE/WSW-oriented surface
    boundary extending from the Upper Midwest into SD and NE.

    While the details regarding convective evolution are unclear and
    will be largely influenced by mesoscale factors, a corridor of
    moderate-strong surface based buoyancy and elongated hodographs
    (40-50 kt of effective shear) will support the potential for
    eastward-spreading clusters and supercell structures capable of
    damaging winds and large hail through the afternoon/evening. The
    greatest potential for an upscale-growing cluster of storms capable
    of producing scattered damaging gusts is expected across parts of SD
    into southwestern MN -- potentially aided by an eastward-moving
    surface wave and gradually strengthening nocturnal LLJ.

    ...Mid-Atlantic/Carolinas...
    Diurnal heating of a very moist air mass (2+ inch PW) may promote
    wet microbursts and the potential for localized wind damage with the
    stronger thunderstorms that evolve during the afternoon. However,
    weak deep-layer flow/shear and nebulous forcing for ascent cast
    uncertainty on the overall severe risk, and severe-wind
    probabilities have been withheld at this time.

    ..Weinman.. 07/05/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Mon Jul 6 07:32:35 2026
    ACUS03 KWNS 060732
    SWODY3
    SPC AC 060731

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0231 AM CDT Mon Jul 06 2026

    Valid 081200Z - 091200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS WEDNESDAY INTO
    WEDNESDAY NIGHT ACROSS PARTS OF THE CENTRAL GREAT PLAINS INTO UPPER
    MIDWEST...

    ...SUMMARY...
    Clusters of strong thunderstorms with potential to produce severe
    hail and wind may evolve across parts of the Upper Midwest into
    central Great Plains Wednesday through Wednesday night.

    ...Discussion...
    It appears that notable remnant mid-level troughing will begin to
    dig southeast of the Hudson Bay vicinity Wednesday through Wednesday
    night, while an upstream short wave trough pivots northeast then
    north of the Canadian Rockies toward the Northwest Territories.
    Within the westerlies to the south of this regime, subtle mid-level
    ridging may overspread the northern Rockies, with similar amplitude
    downstream troughing digging across the northern Great Plains, Upper
    Midwest and Great Lakes region.

    Beneath this regime, a weak cold front, perhaps reinforced by
    convective outflow in some locations, is forecast to overspread much
    of the remainder of the Upper Midwest/adjacent Great Lakes and
    middle Missouri Valley vicinity by late Wednesday night. This may
    be preceded across parts of the central Great Plains by conglomerate
    convective outflow emanating from considerable thunderstorm
    development spreading off the Laramie Range/Front Range vicinity,
    within steering flow trending northwesterly through the period.

    ...Great Plains/Upper Midwest...
    Steeper mid-level lapse rates associated with a remnant plume of
    elevated mixed-layer air may become increasingly confined to the
    higher plains during this period. However, seasonably high moisture
    content along/ahead of the southward advancing cold front may still
    become supportive of mixed-layer CAPE of 1500-2000+ J/kg with
    daytime heating.

    It remains uncertain whether an evolving cluster of storms, and/or a
    possible significant MCV emerging from it, will support continuing
    or renewed organized thunderstorm development posing a risk for
    severe wind gusts into and through the Upper Midwest during the day
    Wednesday. However, it is possible that destabilization in its wake
    could become sufficient to support strong thunderstorm development
    posing a risk for severe hail and wind, ahead of the southward
    advancing cold front later Wednesday into Wednesday night.

    Otherwise, guidance suggests considerable thunderstorm activity,
    initiating off the higher terrain of southeastern Wyoming through
    central Colorado by late Wednesday, may gradually intensify and
    consolidate within a more unstable environment near a broad/weak
    surface cyclone developing across the high plains. Aided by a
    nocturnally strengthening low-level jet, there appears at least
    potential for this activity to organize with potential to swaths of
    strong to severe surface gusts Wednesday evening, after initially
    posing a risk for severe hail and localized downbursts.

    ..Kerr.. 07/06/2026

    $$

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  • From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Mon Jul 6 19:25:43 2026
    ACUS03 KWNS 061925
    SWODY3
    SPC AC 061924

    Day 3 Convective Outlook
    NWS Storm Prediction Center Norman OK
    0224 PM CDT Mon Jul 06 2026

    Valid 081200Z - 091200Z

    ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE CENTRAL
    PLAINS INTO THE UPPER MIDWEST...

    ...SUMMARY...
    Clusters of strong thunderstorms with potential to produce severe
    hail and wind may evolve across parts of the Upper Midwest into
    central Great Plains Wednesday through Wednesday night.

    ...Central Plains into the Upper Midwest...
    A generally zonal pattern will exist on Wednesday, with various
    disturbances moving across the northern Plains to Great Lakes. One
    disturbance will affect the upper MS Valley to Great Lakes during
    the day, with another developing late into the northern High Plains.
    Within the entire zone, midlevel westerlies will average 30-35 kt.

    In the low levels, a front should stretch from near Lake Superior
    into central NE, where it will stall. Widespread mid to upper 60s F
    dewpoints will remain ahead of the front, contributing to 2000-3000
    J/kg MUCAPE by afternoon.

    Early activity is likely moving out of MN and into WI, and may
    overturn some of the air mass and push the effective boundary
    around. New diurnal storms are then likely during the afternoon,
    roughly from WI into southern MN and IA, with wind and hail
    potential.

    Farther west, scattered strong to severe storms are likely across
    the High Plains, where strong heating and steep lapse rates will
    favor development beneath modest northwest flow aloft. Moisture and
    instability look sufficient, but not overlay strong, and will
    support scattered strong to severe gusts and some hail.

    ..Jewell.. 07/06/2026

    $$

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