:Product: 3-Day Forecast
:Issued: 2025 Mar 28 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 5 (NOAA Scale
G1).
The greatest expected 3 hr Kp for Mar 28-Mar 30 2025 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Mar 28-Mar 30 2025

Mar 28 Mar 29 Mar 30
00-03UT 3.67 3.33 3.00
03-06UT 4.00 2.00 2.67
06-09UT 4.67 2.00 2.00
09-12UT 3.67 3.00 2.00
12-15UT 3.67 3.00 2.00
15-18UT 3.67 3.33 1.33
18-21UT 4.00 3.33 1.33
21-00UT 4.00 3.33 2.33

Rationale: The geomagnetic field is expected to observe periods of G1
(Minor) geomagnetic storm levels on 28 Mar due to CH HSS influence.

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 Mar 28-Mar 30 2025

Mar 28 Mar 29 Mar 30
S1 or greater 1% 1% 1%

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

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Mar 27 2025 0037 UTC.

Radio Blackout Forecast for Mar 28-Mar 30 2025

Mar 28 Mar 29 Mar 30
R1-R2 25% 25% 25%
R3 or greater 1% 1% 1%

Rationale: There exists a chance for R1-R2 (Minor-Moderate) radio
blackouts over 28-30 Mar.



--- MBSE BBS v1.1.0 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Mar 31 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 Mar 31-Apr 02 2025 is 3.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Mar 31-Apr 02 2025

Mar 31 Apr 01 Apr 02
00-03UT 2.33 2.33 2.67
03-06UT 2.00 3.00 2.67
06-09UT 2.00 3.00 2.00
09-12UT 2.00 2.33 2.00
12-15UT 2.00 2.00 1.67
15-18UT 2.00 2.00 1.67
18-21UT 2.33 2.33 2.00
21-00UT 2.67 2.00 2.33

Rationale: No G1 (Minor) or greater geomagnetic storms are expected.

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 Mar 31-Apr 02 2025

Mar 31 Apr 01 Apr 02
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

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Mar 30 2025 1642 UTC.

Radio Blackout Forecast for Mar 31-Apr 02 2025

Mar 31 Apr 01 Apr 02
R1-R2 55% 50% 50%
R3 or greater 10% 10% 10%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely on 31 Mar,
with a chance for up to R2 events persists through 02 Apr. A slight
chance for R3 (Strong) events exists for 31 Mar - 02 Apr.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Apr 03 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 Apr 03-Apr 05 2025 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 03-Apr 05 2025

Apr 03 Apr 04 Apr 05
00-03UT 3.67 1.00 5.00 (G1)
03-06UT 3.33 1.00 4.00
06-09UT 3.00 2.33 3.67
09-12UT 2.33 3.67 3.33
12-15UT 2.00 3.33 2.33
15-18UT 1.33 3.33 2.33
18-21UT 2.00 3.67 2.67
21-00UT 2.33 5.00 (G1) 2.67

Rationale: G1 (Minor) geomagnetic storms are likely on 04-05 Apr due to anticipated recurrent coronal hole activity.

B. NOAA Solar Radiation Activity Observation and Forecast

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

Solar Radiation Storm Forecast for Apr 03-Apr 05 2025

Apr 03 Apr 04 Apr 05
S1 or greater 15% 15% 15%

Rationale: There is a slight chance for S1 (Minor) solar radiation
storms over 03-05 Apr, primarily due to the flare potential from Region
4048.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Apr 03-Apr 05 2025

Apr 03 Apr 04 Apr 05
R1-R2 70% 70% 70%
R3 or greater 15% 15% 15%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely over 03-05
Apr, primarily due to the flare potential from Region 4048.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Apr 06 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 6 (NOAA Scale
G2).
The greatest expected 3 hr Kp for Apr 06-Apr 08 2025 is 5.67 (NOAA Scale
G2).

NOAA Kp index breakdown Apr 06-Apr 08 2025

Apr 06 Apr 07 Apr 08
00-03UT 5.67 (G2) 2.33 3.33
03-06UT 4.00 2.67 3.67
06-09UT 3.33 2.00 3.00
09-12UT 3.00 2.00 2.67
12-15UT 2.33 2.33 2.33
15-18UT 2.33 3.00 2.33
18-21UT 2.00 3.33 2.00
21-00UT 1.67 3.67 1.67

Rationale: G1-G2 (Minor-Moderate) geomagnetic storms are expected on 06
Apr due to continued coronal hole influence.

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 Apr 06-Apr 08 2025

Apr 06 Apr 07 Apr 08
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

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Apr 05 2025 2005 UTC.

Radio Blackout Forecast for Apr 06-Apr 08 2025

Apr 06 Apr 07 Apr 08
R1-R2 60% 60% 55%
R3 or greater 15% 10% 10%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a
slight chance for R3 (Strong), over 06-08 Apr.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Apr 09 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 5 (NOAA Scale
G1).
The greatest expected 3 hr Kp for Apr 09-Apr 11 2025 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 09-Apr 11 2025

Apr 09 Apr 10 Apr 11
00-03UT 4.00 3.00 1.67
03-06UT 3.67 3.67 1.67
06-09UT 4.67 (G1) 3.00 2.00
09-12UT 2.33 2.33 3.00
12-15UT 2.00 2.00 4.00
15-18UT 2.00 2.00 3.33
18-21UT 2.67 2.33 2.00
21-00UT 3.33 3.00 2.00

Rationale: G1 (Minor) geomagnetic storming is expected on 09 Apr under
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 Apr 09-Apr 11 2025

Apr 09 Apr 10 Apr 11
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

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Apr 08 2025 2222 UTC.

Radio Blackout Forecast for Apr 09-Apr 11 2025

Apr 09 Apr 10 Apr 11
R1-R2 40% 40% 40%
R3 or greater 5% 5% 5%

Rationale: A chance for R1-2 (Minor-Moderate) radio blackouts will
persist through 11 Apr primarily due to the flare potential observed in
ARs 4048 and 4054.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Apr 12 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 Apr 12-Apr 14 2025 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 12-Apr 14 2025

Apr 12 Apr 13 Apr 14
00-03UT 3.67 3.67 3.00
03-06UT 3.67 3.67 3.33
06-09UT 4.67 (G1) 2.67 2.67
09-12UT 4.67 (G1) 3.00 2.67
12-15UT 3.67 3.00 2.67
15-18UT 2.67 3.00 2.00
18-21UT 2.67 3.00 2.00
21-00UT 2.33 3.00 2.67

Rationale: G1 (Minor) geomagnetic storm levels are likely on 12 Apr due
to CH HSS activity.

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 Apr 12-Apr 14 2025

Apr 12 Apr 13 Apr 14
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

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Apr 11 2025 1650 UTC.

Radio Blackout Forecast for Apr 12-Apr 14 2025

Apr 12 Apr 13 Apr 14
R1-R2 50% 50% 50%
R3 or greater 5% 5% 5%

Rationale: There is an increased chance for M-class flares (R1-R2, Minor-Moderate) on 12-14 Apr due primarily to the flare potential from
Regions 4055 and 4060.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Apr 15 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 Apr 15-Apr 17 2025 is 6.00 (NOAA Scale
G2).

NOAA Kp index breakdown Apr 15-Apr 17 2025

Apr 15 Apr 16 Apr 17
00-03UT 3.67 4.00 4.33
03-06UT 3.00 3.00 4.33
06-09UT 3.00 5.00 (G1) 4.00
09-12UT 3.67 4.00 3.67
12-15UT 2.67 6.00 (G2) 4.33
15-18UT 2.00 4.00 3.00
18-21UT 2.00 5.00 (G1) 2.67
21-00UT 3.67 4.33 4.00

Rationale: G1-G2 (Minor-Moderate) storming is likely on 16 Apr due to
CME arrival from filament eruptions that left the Sun on 13 Apr.

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 Apr 15-Apr 17 2025

Apr 15 Apr 16 Apr 17
S1 or greater 10% 10% 5%

Rationale: There is a slight chance for S1 (minor) solar radiation
storms on 15-16 Apr.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Apr 14 2025 0650 UTC.

Radio Blackout Forecast for Apr 15-Apr 17 2025

Apr 15 Apr 16 Apr 17
R1-R2 80% 75% 60%
R3 or greater 15% 10% 10%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected on 16-17
Apr, with a slight chance for R3 (Strong) events. Probabilities decrease slightly on 17 Apr.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Apr 18 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 Apr 18-Apr 20 2025 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 18-Apr 20 2025

Apr 18 Apr 19 Apr 20
00-03UT 2.67 2.67 2.33
03-06UT 3.00 2.00 3.00
06-09UT 4.00 2.67 2.33
09-12UT 3.00 2.33 1.67
12-15UT 2.33 2.33 1.33
15-18UT 1.67 2.33 1.00
18-21UT 1.67 2.33 1.67
21-00UT 2.33 2.33 2.00

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 Apr 18-Apr 20 2025

Apr 18 Apr 19 Apr 20
S1 or greater 1% 1% 1%

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 Apr 18-Apr 20 2025

Apr 18 Apr 19 Apr 20
R1-R2 55% 55% 55%
R3 or greater 10% 10% 10%

Rationale: Isolated R1-2 (Minor-Moderate) radio blackouts are likely
through 20 Apr.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Apr 21 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 5 (NOAA Scale
G1).
The greatest expected 3 hr Kp for Apr 21-Apr 23 2025 is 6.00 (NOAA Scale
G2).

NOAA Kp index breakdown Apr 21-Apr 23 2025

Apr 21 Apr 22 Apr 23
00-03UT 3.00 3.00 4.00
03-06UT 3.67 2.00 5.67 (G2)
06-09UT 2.00 3.00 4.33
09-12UT 2.00 4.00 4.00
12-15UT 2.00 4.33 4.67 (G1)
15-18UT 2.00 5.00 (G1) 4.33
18-21UT 2.67 5.33 (G1) 3.00
21-00UT 3.67 6.00 (G2) 4.67 (G1)

Rationale: Periods of G1-G2 (Minor-Moderate) geomagnetic storms are
likely on 22-23 Apr due to the influences of a positive polarity CH HSS.

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 Apr 21-Apr 23 2025

Apr 21 Apr 22 Apr 23
S1 or greater 1% 1% 1%

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

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Apr 20 2025 1211 UTC.

Radio Blackout Forecast for Apr 21-Apr 23 2025

Apr 21 Apr 22 Apr 23
R1-R2 40% 40% 40%
R3 or greater 5% 5% 5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 21-23 Apr.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Apr 24 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 Apr 24-Apr 26 2025 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 24-Apr 26 2025

Apr 24 Apr 25 Apr 26
00-03UT 4.00 3.67 2.33
03-06UT 3.33 3.00 2.00
06-09UT 3.33 2.00 2.33
09-12UT 4.00 2.67 2.00
12-15UT 3.00 2.67 2.00
15-18UT 3.00 2.67 2.00
18-21UT 2.33 2.00 2.00
21-00UT 2.67 2.67 2.00

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 Apr 24-Apr 26 2025

Apr 24 Apr 25 Apr 26
S1 or greater 1% 1% 1%

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 Apr 24-Apr 26 2025

Apr 24 Apr 25 Apr 26
R1-R2 40% 40% 40%
R3 or greater 1% 1% 1%

Rationale: There is a chance for R1 (Minor) radio blackouts. No
significant active region flare activity is forecast.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2025 Apr 27 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 27-Apr 29 2025 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 27-Apr 29 2025

Apr 27 Apr 28 Apr 29
00-03UT 3.33 3.00 2.33
03-06UT 2.00 2.00 2.33
06-09UT 2.00 2.00 2.00
09-12UT 3.00 2.67 2.33
12-15UT 3.00 2.67 2.33
15-18UT 4.00 2.67 1.67
18-21UT 3.33 2.67 2.33
21-00UT 3.00 3.00 2.33

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 Apr 27-Apr 29 2025

Apr 27 Apr 28 Apr 29
S1 or greater 1% 1% 1%

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 Apr 27-Apr 29 2025

Apr 27 Apr 28 Apr 29
R1-R2 25% 25% 25%
R3 or greater 1% 1% 1%

Rationale: No R1 (Minor) or greater radio blackouts are expected. No significant active region flare activity is forecast.



--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)