• MESO: Mesoscale Discussion 1422

    From COD Weather Processor@1:2320/127 to wx-storm@lists.illinois.edu on Wed Jul 1 19:42:50 2026
    ACUS11 KWNS 011942
    SWOMCD
    SPC MCD 011942=20
    MTZ000-WYZ000-IDZ000-012145-

    Mesoscale Discussion 1422
    NWS Storm Prediction Center Norman OK
    0242 PM CDT Wed Jul 01 2026

    Areas affected...Portions of Idaho and Montana

    Concerning...Severe potential...Watch unlikely=20

    Valid 011942Z - 012145Z

    Probability of Watch Issuance...5 percent

    SUMMARY...Isolated strong to severe wind gusts will be possible as thunderstorms overspread portions of northeast Idaho and
    southwest/central Montana. Watch issuance is not expected.

    DISCUSSION...Lightning counts have been trending up across northeast
    ID and southwest MT over the past hour as an upper wave begins to
    shift east and temperatures warm into the upper 60s/low 70s. A
    combination a modest low-level moisture and cold temperatures aloft
    are supporting MLCAPE values on the order of 500 J/kg, which may
    increase slightly through late afternoon as daytime heating and some
    degree of mid-level ascent/cooling continues. Downstream of the
    developing convection, low-level lapse rates have steadily increased
    to around 8 C/km, which should support some potential for
    accelerating downdrafts and strong/severe downburst winds.
    Additionally, 25-30 knot mid-level flow sampled by the KSFX VWP
    suggests that some degree of cell organization is possible and may
    support a transient threat for large hail as well as severe gusts.
    In general, this potential should remain sufficiently isolated to
    preclude watch issuance.

    ..Moore/Guyer.. 07/01/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!4FRjkIjGPJ1yuRDbedC4gAA8gHSXFn5aIf6plVhhDd6hgyqnq3kSDGFJ-ydFEgDXD8-6cnqo8= F9Mr9mqfBA-PRC8GRo$ for graphic product...

    ATTN...WFO...BYZ...RIW...TFX...PIH...MSO...BOI...

    LAT...LON 48220995 48020915 47630882 47170875 46640886 46210917
    45760969 45271025 44521097 43641118 43181139 42901187
    42821252 43221399 43491447 43761470 44191478 44581474
    45261440 46081349 47931138 48151082 48220995=20

    MOST PROBABLE PEAK WIND GUST...55-70 MPH
    MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN


    =3D =3D =3D
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    * Origin: Capitol City Weather Station (1:2320/127)