:Product: 3-Day Forecast
:Issued: 2026 Apr 01 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 01-Apr 03 2026 is 6.33 (NOAA Scale
G2).

NOAA Kp index breakdown Apr 01-Apr 03 2026

Apr 01 Apr 02 Apr 03
00-03UT 3.00 4.33 3.67
03-06UT 5.67 (G2) 4.00 3.33
06-09UT 6.33 (G2) 3.33 3.00
09-12UT 4.67 (G1) 2.33 3.00
12-15UT 4.33 3.00 3.00
15-18UT 4.00 4.67 (G1) 3.00
18-21UT 4.67 (G1) 4.33 3.33
21-00UT 3.67 4.67 (G1) 3.67

Rationale: G2 (Moderate) geomagnetic storming levels are likely with a
chance for isolated G3 (Strong) storm levels possible 01 Apr due to
effects from the CME associated with 30 Mar X1.4 major flare event.
Active to G1 (Minor) levels are anticipated to continue into 02 Apr as
CME effects wane alongside the forecasted onset of CH HSS activity which
is likely to cause unsettled to active levels on 03 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 01-Apr 03 2026

Apr 01 Apr 02 Apr 03
S1 or greater 15% 15% 15%

Rationale: There is a slight chance for the greater than 10 MeV proton
flux to exceed S1 (Minor) solar radiation storm levels through 03 Apr
due to the X1.4 flare at 30/0319 UTC and anticipated arrival of its
associated CME alongside the complexity and evolution of the active
regions currently on the solar disk.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Apr 01-Apr 03 2026

Apr 01 Apr 02 Apr 03
R1-R2 55% 55% 55%
R3 or greater 20% 20% 20%

Rationale: Solar activity is likely to reach Minor-Moderate (R1-R2)
levels, with a slight chance for X-class flares (R3/Strong) through 03
Apr due to the complexity and evolution of the active regions currently
on the solar disk.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)

:Product: 3-Day Forecast
:Issued: 2026 Apr 05 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 05-Apr 07 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 05-Apr 07 2026

Apr 05 Apr 06 Apr 07
00-03UT 3.67 2.67 2.67
03-06UT 3.33 3.00 2.67
06-09UT 3.00 2.67 2.67
09-12UT 3.00 2.67 2.00
12-15UT 2.67 2.00 0.67
15-18UT 2.00 1.67 0.67
18-21UT 2.00 1.67 1.67
21-00UT 2.67 2.67 2.67

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 05-Apr 07 2026

Apr 05 Apr 06 Apr 07
S1 or greater 20% 20% 20%

Rationale: There is a slight chance for the greater than 10 MeV proton
flux to exceed S1 (Minor) solar radiation storm levels over 05-07 Apr.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R2 levels were observed over the past 24
hours. The largest was at Apr 04 2026 0117 UTC.

Radio Blackout Forecast for Apr 05-Apr 07 2026

Apr 05 Apr 06 Apr 07
R1-R2 55% 55% 55%
R3 or greater 20% 20% 20%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a
slight chance for an isolated R3 (Strong) event, over 05-07 Apr, driven primarily by the flare potential of Region 4409.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)

:Product: 3-Day Forecast
:Issued: 2026 Apr 08 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 08-Apr 10 2026 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 08-Apr 10 2026

Apr 08 Apr 09 Apr 10
00-03UT 2.33 3.33 2.33
03-06UT 2.00 3.00 5.00 (G1)
06-09UT 1.67 1.67 4.67 (G1)
09-12UT 1.33 1.00 3.67
12-15UT 0.67 0.67 2.67
15-18UT 2.00 1.33 2.67
18-21UT 2.33 1.33 3.67
21-00UT 3.00 1.67 4.00

Rationale: G1 (Minor) or greater geomagnetic storms are likely on 10 Apr
due to a new positive polarity coronal hole stream 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 08-Apr 10 2026

Apr 08 Apr 09 Apr 10
S1 or greater 10% 10% 10%

Rationale: There is a slight chance for the greater than 10 MeV proton
flux to exceed S1 (Minor) solar radiation storm levels 08-10 Apr.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Apr 08-Apr 10 2026

Apr 08 Apr 09 Apr 10
R1-R2 35% 35% 35%
R3 or greater 10% 10% 10%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts,
with a slight chance for R3 (Strong) or greater events 08-10 Apr.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)

:Product: 3-Day Forecast
:Issued: 2026 Apr 11 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 11-Apr 13 2026 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 11-Apr 13 2026

Apr 11 Apr 12 Apr 13
00-03UT 3.67 3.67 2.67
03-06UT 4.67 (G1) 3.67 2.67
06-09UT 4.00 3.67 3.00
09-12UT 4.00 2.67 2.67
12-15UT 3.00 2.67 1.67
15-18UT 2.67 1.67 1.67
18-21UT 4.00 2.67 2.00
21-00UT 4.67 (G1) 3.00 2.67

Rationale: Periods of G1 (Minor) storm levels are expected on 11 Apr due
to +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 Apr 11-Apr 13 2026

Apr 11 Apr 12 Apr 13
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 11-Apr 13 2026

Apr 11 Apr 12 Apr 13
R1-R2 5% 5% 5%
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 v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)

:Product: 3-Day Forecast
:Issued: 2026 Apr 14 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 1 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 14-Apr 16 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 14-Apr 16 2026

Apr 14 Apr 15 Apr 16
00-03UT 1.67 2.67 1.67
03-06UT 2.67 3.00 2.67
06-09UT 1.67 4.00 2.67
09-12UT 1.67 2.67 2.33
12-15UT 1.00 2.67 1.67
15-18UT 0.67 1.67 1.67
18-21UT 1.67 1.67 1.67
21-00UT 2.00 2.00 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 14-Apr 16 2026

Apr 14 Apr 15 Apr 16
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 14-Apr 16 2026

Apr 14 Apr 15 Apr 16
R1-R2 10% 10% 10%
R3 or greater 1% 1% 1%

Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts on 14-16 Apr.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)

:Product: 3-Day Forecast
:Issued: 2026 Apr 16 1230 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 16-Apr 18 2026 is 6.00 (NOAA Scale
G2).

NOAA Kp index breakdown Apr 16-Apr 18 2026

Apr 16 Apr 17 Apr 18
00-03UT 0.67 2.33 6.00 (G2)
03-06UT 1.00 2.67 6.00 (G2)
06-09UT 1.00 2.67 5.00 (G1)
09-12UT 0.67 2.00 4.00
12-15UT 1.67 1.33 3.67
15-18UT 1.67 2.67 3.33
18-21UT 1.67 4.33 3.00
21-00UT 2.33 5.67 (G2) 4.33

Rationale: G1-G2 (Minor-Moderate) geomagnetic storms are likely on 17-18
Apr due to the anticipated arrival of a negative polarity CH HSS CIR.

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 16-Apr 18 2026

Apr 16 Apr 17 Apr 18
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 16-Apr 18 2026

Apr 16 Apr 17 Apr 18
R1-R2 30% 30% 30%
R3 or greater 5% 5% 5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
through 18 Apr, mostly due to the flare potential of Region 4419.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (1:18/200)