:Product: 3-Day Forecast
:Issued: 2025 Jun 17 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
A. NOAA Geomagnetic Activity Observation and Forecast

The greatest observed 3 hr Kp over the past 24 hours was 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 17-Jun 19 2025 is 4.33 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 17-Jun 19 2025

Jun 17 Jun 18 Jun 19
00-03UT 3.00 3.33 3.33
03-06UT 3.67 3.00 2.00
06-09UT 2.67 2.00 2.00
09-12UT 2.67 2.33 3.00
12-15UT 2.33 2.67 3.00
15-18UT 1.67 3.33 3.33
18-21UT 0.67 4.00 3.33
21-00UT 1.00 4.33 3.33

Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No significant transient or recurrent solar wind features are forecast.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jun 17-Jun 19 2025

Jun 17 Jun 18 Jun 19
S1 or greater 30% 15% 5%

Rationale: There is a decreasing chance for S1 (Minor) or greater solar radiation storms over the next three days.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R2 levels were observed over the past 24
hours. The largest was at Jun 16 2025 0938 UTC.

Radio Blackout Forecast for Jun 17-Jun 19 2025

Jun 17 Jun 18 Jun 19
R1-R2 75% 75% 70%
R3 or greater 30% 30% 30%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected, with a
chance for R3 (Strong) or greater events, over 17-19 Jun.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)

:Product: 3-Day Forecast
:Issued: 2025 Jun 20 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
A. NOAA Geomagnetic Activity Observation and Forecast

The greatest observed 3 hr Kp over the past 24 hours was 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 20-Jun 22 2025 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Jun 20-Jun 22 2025

Jun 20 Jun 21 Jun 22
00-03UT 2.33 2.67 1.67
03-06UT 4.33 2.00 1.33
06-09UT 5.00 (G1) 2.33 1.33
09-12UT 4.33 2.33 1.33
12-15UT 3.33 2.33 1.67
15-18UT 3.33 2.33 1.33
18-21UT 2.33 2.33 1.67
21-00UT 3.67 2.67 1.33

Rationale: An isolated period of G1 (Minor) geomagnetic storms are
likely on 20 Jun due to positive polarity CH HSS influences and possible influences from a CME that left the Sun on 17 Jun.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jun 20-Jun 22 2025

Jun 20 Jun 21 Jun 22
S1 or greater 10% 10% 10%

Rationale: There is a slight chance for S1 (Minor) solar radiation
storms over 20-22 Jun.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R3 levels were observed over the past 24
hours. The largest was at Jun 19 2025 2350 UTC.

Radio Blackout Forecast for Jun 20-Jun 22 2025

Jun 20 Jun 21 Jun 22
R1-R2 65% 65% 65%
R3 or greater 15% 15% 15%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected, with a
slight chance for R3 (Strong) or greater events, over 20-22 Jun.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)

:Product: 3-Day Forecast
:Issued: 2025 Jun 23 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
A. NOAA Geomagnetic Activity Observation and Forecast

The greatest observed 3 hr Kp over the past 24 hours was 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 23-Jun 25 2025 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown Jun 23-Jun 25 2025

Jun 23 Jun 24 Jun 25
00-03UT 2.67 3.00 4.67 (G1)
03-06UT 2.00 3.67 4.67 (G1)
06-09UT 2.00 2.00 4.00
09-12UT 2.67 2.67 4.00
12-15UT 3.67 2.67 4.67 (G1)
15-18UT 2.67 2.67 4.67 (G1)
18-21UT 2.67 2.67 4.67 (G1)
21-00UT 3.00 2.00 4.00

Rationale: Periods of G1 (Minor) geomagnetic storms are likely on 25 Jun
due to the onset of negative polarity CH HSS influences.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jun 23-Jun 25 2025

Jun 23 Jun 24 Jun 25
S1 or greater 10% 10% 10%

Rationale: There is a slight chance for S1 (Minor) solar radiation
storms over 23-25 Jun due to eruptive potential from multiple regions on
the visible disk.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Jun 23-Jun 25 2025

Jun 23 Jun 24 Jun 25
R1-R2 45% 45% 45%
R3 or greater 10% 10% 10%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts,
and a slight chance for R3 (Strong) or greater events, over 23-25 Jun.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)

:Product: 3-Day Forecast
:Issued: 2025 Jun 26 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
A. NOAA Geomagnetic Activity Observation and Forecast

The greatest observed 3 hr Kp over the past 24 hours was 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 26-Jun 28 2025 is 5.33 (NOAA Scale
G1).

NOAA Kp index breakdown Jun 26-Jun 28 2025

Jun 26 Jun 27 Jun 28
00-03UT 5.33 (G1) 4.00 3.67
03-06UT 5.00 (G1) 4.67 (G1) 3.33
06-09UT 4.00 4.00 3.00
09-12UT 3.67 3.33 2.67
12-15UT 3.00 2.33 2.33
15-18UT 3.00 2.33 2.33
18-21UT 4.00 2.67 2.67
21-00UT 5.00 (G1) 3.00 2.67

Rationale: G1 (Minor) geomagnetic storming is likely, with a chance for
an insolated G2 (Moderate) storming period, on 26-27 June due to
negative polarity CH HSS effects.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jun 26-Jun 28 2025

Jun 26 Jun 27 Jun 28
S1 or greater 5% 5% 5%

Rationale: No S1 (Minor) or greater solar radiation storms are expected.
No significant active region activity favorable for radiation storm
production is forecast.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Jun 26-Jun 28 2025

Jun 26 Jun 27 Jun 28
R1-R2 30% 35% 35%
R3 or greater 5% 5% 5%

Rationale: A chance for R1-R2 (Minor-Moderate) radio blackouts, with a
slight chance for X-class flares (R3-Strong), will persist through 28
June.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)

:Product: 3-Day Forecast
:Issued: 2025 Jun 29 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
A. NOAA Geomagnetic Activity Observation and Forecast

The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 29-Jul 01 2025 is 2.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 29-Jul 01 2025

Jun 29 Jun 30 Jul 01
00-03UT 2.67 1.67 1.33
03-06UT 2.33 1.67 1.67
06-09UT 2.33 1.67 1.33
09-12UT 2.00 1.33 1.33
12-15UT 1.33 1.33 1.67
15-18UT 1.67 1.33 1.67
18-21UT 2.00 1.33 1.33
21-00UT 2.00 1.33 1.33

Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No significant transient or recurrent solar wind features are forecast.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jun 29-Jul 01 2025

Jun 29 Jun 30 Jul 01
S1 or greater 5% 5% 5%

Rationale: No S1 (Minor) or greater solar radiation storms are expected.
No significant active region activity favorable for radiation storm
production is forecast.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Jun 29-Jul 01 2025

Jun 29 Jun 30 Jul 01
R1-R2 25% 25% 25%
R3 or greater 5% 5% 5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
through the period.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)