:Product: 3-Day Forecast
:Issued: 2026 May 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 6 (NOAA Scale
G2).
The greatest expected 3 hr Kp for May 05-May 07 2026 is 5.67 (NOAA Scale
G2).

NOAA Kp index breakdown May 05-May 07 2026

May 05 May 06 May 07
00-03UT 5.33 (G1) 2.67 3.33
03-06UT 5.67 (G2) 2.33 3.67
06-09UT 5.00 (G1) 2.00 3.00
09-12UT 4.00 1.33 2.33
12-15UT 3.00 1.67 2.33
15-18UT 2.33 2.33 3.33
18-21UT 2.00 2.00 3.33
21-00UT 2.67 2.67 3.67

Rationale: Isolated G1-G2 (Minor-Moderate) storming periods are possible
early on 05 May as CME/CH HSS effects persist.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 05-May 07 2026

May 05 May 06 May 07
S1 or greater 5% 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 May 04 2026 0133 UTC.

Radio Blackout Forecast for May 05-May 07 2026

May 05 May 06 May 07
R1-R2 30% 30% 30%
R3 or greater 5% 5% 5%

Rationale: There is a chance for isolated R1-R2 (Minor-Moderate) radio blackouts on 05-07 May, primarily due to the flare potential of Region
4429.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2026 May 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 May 08-May 10 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown May 08-May 10 2026

May 08 May 09 May 10
00-03UT 2.67 2.67 2.67
03-06UT 3.67 3.67 2.67
06-09UT 4.00 3.00 2.00
09-12UT 2.67 2.67 2.00
12-15UT 3.67 2.67 2.00
15-18UT 1.67 1.67 1.67
18-21UT 2.33 2.00 1.67
21-00UT 2.67 2.67 2.00

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-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 08-May 10 2026

May 08 May 09 May 10
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 May 07 2026 1514 UTC.

Radio Blackout Forecast for May 08-May 10 2026

May 08 May 09 May 10
R1-R2 45% 45% 45%
R3 or greater 10% 10% 10%

Rationale: There exists a chance for R1-R2 (Minor-Moderate) radio
blackouts, and a slight chance for R3 (Strong), over 08-10 May.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2026 May 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 11-May 13 2026 is 2.67 (below NOAA
Scale levels).

NOAA Kp index breakdown May 11-May 13 2026

May 11 May 12 May 13
00-03UT 1.67 1.67 1.67
03-06UT 2.67 1.67 2.67
06-09UT 2.67 1.33 2.67
09-12UT 1.67 1.33 2.33
12-15UT 1.33 1.33 2.33
15-18UT 1.33 0.67 2.00
18-21UT 2.00 1.67 2.33
21-00UT 2.67 1.67 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-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 11-May 13 2026

May 11 May 12 May 13
S1 or greater 20% 20% 20%

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 R2 levels were observed over the past 24
hours. The largest was at May 10 2026 1339 UTC.

Radio Blackout Forecast for May 11-May 13 2026

May 11 May 12 May 13
R1-R2 45% 45% 45%
R3 or greater 20% 20% 20%

Rationale: There exists a chance for R1-R2 (Minor-Moderate) radio
blackouts, with a slight chance for R3 (Strong), over 11-13 May.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2026 May 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 14-May 16 2026 is 5.67 (NOAA Scale
G2).

NOAA Kp index breakdown May 14-May 16 2026

May 14 May 15 May 16
00-03UT 3.33 4.00 4.33
03-06UT 3.00 5.67 (G2) 5.00 (G1)
06-09UT 2.33 4.00 3.67
09-12UT 2.00 3.67 3.33
12-15UT 1.67 3.67 3.33
15-18UT 2.00 3.67 3.33
18-21UT 2.67 4.00 3.33
21-00UT 3.67 3.67 3.33

Rationale: G1-G2 (Minor-Moderate) geomagnetic storms are likely on 15-16
May due to CH HSS influences.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 14-May 16 2026

May 14 May 15 May 16
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 May 14-May 16 2026

May 14 May 15 May 16
R1-R2 40% 40% 40%
R3 or greater 5% 5% 5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
through 16 May.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2026 May 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 6 (NOAA Scale
G2).
The greatest expected 3 hr Kp for May 17-May 19 2026 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown May 17-May 19 2026

May 17 May 18 May 19
00-03UT 3.33 3.67 4.33
03-06UT 4.00 3.33 3.67
06-09UT 4.67 (G1) 3.00 3.00
09-12UT 2.33 2.67 2.00
12-15UT 2.00 2.67 1.67
15-18UT 2.33 5.00 (G1) 2.00
18-21UT 3.00 3.33 3.00
21-00UT 3.67 3.33 3.33

Rationale: G1 (Minor) geomagnetic storms are expected on 17 May due to
the negative polarity CH HSS ongoing effects. G1 (Minor) storming levels
are likely on 18 May due to possible glancing blow of a CME from 16 May.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 17-May 19 2026

May 17 May 18 May 19
S1 or greater 5% 5% 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 May 16 2026 1742 UTC.

Radio Blackout Forecast for May 17-May 19 2026

May 17 May 18 May 19
R1-R2 40% 40% 40%
R3 or greater 5% 5% 5%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely through 19
May due to the flare potential and evolution of the active regions on
the visible disk.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2026 May 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 May 20-May 22 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown May 20-May 22 2026

May 20 May 21 May 22
00-03UT 2.67 2.67 2.67
03-06UT 2.33 2.00 3.67
06-09UT 2.00 2.33 2.00
09-12UT 2.00 2.33 0.67
12-15UT 2.00 2.33 1.67
15-18UT 2.00 2.33 1.67
18-21UT 2.00 2.33 2.33
21-00UT 2.00 2.67 2.33

Rationale: No G1 (Minor) or greater geomagnetic storms are expected. A
solar sector boundary crossing and positive polarity CH HSS influences
are possible through 21-22 May.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 20-May 22 2026

May 20 May 21 May 22
S1 or greater 5% 5% 5%

Rationale: No S1 (Minor) or greater solar radiation storms are expected.


C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for May 20-May 22 2026

May 20 May 21 May 22
R1-R2 20% 20% 25%
R3 or greater 5% 5% 5%

Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts through 21 May, increasing to a chance on 22 May. R3 (Strong)
or greater events are not expected.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2026 May 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 23-May 25 2026 is 2.67 (below NOAA
Scale levels).

NOAA Kp index breakdown May 23-May 25 2026

May 23 May 24 May 25
00-03UT 2.33 1.67 1.67
03-06UT 2.67 1.67 1.33
06-09UT 2.33 1.33 1.33
09-12UT 1.67 1.33 1.33
12-15UT 1.67 1.33 1.67
15-18UT 2.00 1.33 1.33
18-21UT 2.33 1.33 1.67
21-00UT 2.33 1.67 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-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 23-May 25 2026

May 23 May 24 May 25
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 May 22 2026 1029 UTC.

Radio Blackout Forecast for May 23-May 25 2026

May 23 May 24 May 25
R1-R2 25% 25% 25%
R3 or greater 5% 5% 5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 23-25 May.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2026 May 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 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 26-May 28 2026 is 3.67 (below NOAA
Scale levels).

NOAA Kp index breakdown May 26-May 28 2026

May 26 May 27 May 28
00-03UT 1.67 2.67 3.00
03-06UT 1.67 3.67 3.67
06-09UT 2.00 3.00 3.00
09-12UT 1.67 2.67 2.67
12-15UT 1.67 2.33 2.00
15-18UT 1.67 2.00 1.67
18-21UT 2.00 2.33 2.67
21-00UT 2.00 2.67 1.67

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-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 26-May 28 2026

May 26 May 27 May 28
S1 or greater 50% 5% 5%

Rationale: There is a chance for S1 (Minor) or greater solar radiation
storms due to activity beyond the NW limb.

C. NOAA Radio Blackout Activity and Forecast

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for May 26-May 28 2026

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

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
all three days.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2026 May 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 29-May 31 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown May 29-May 31 2026

May 29 May 30 May 31
00-03UT 3.33 2.33 3.00
03-06UT 2.67 2.00 2.33
06-09UT 2.33 1.33 2.33
09-12UT 2.33 1.33 1.67
12-15UT 2.00 2.67 3.33
15-18UT 2.33 2.33 2.67
18-21UT 2.67 3.00 4.00
21-00UT 3.67 3.00 3.67

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 May 29-May 31 2026

May 29 May 30 May 31
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 May 29-May 31 2026

May 29 May 30 May 31
R1-R2 40% 40% 40%
R3 or greater 5% 5% 5%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
through 31 May.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)

:Product: 3-Day Forecast
:Issued: 2026 Jun 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 01-Jun 03 2026 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Jun 01-Jun 03 2026

Jun 01 Jun 02 Jun 03
00-03UT 3.67 2.67 2.00
03-06UT 3.00 2.33 3.33
06-09UT 2.33 2.00 4.00
09-12UT 2.00 1.33 3.00
12-15UT 1.67 1.33 2.67
15-18UT 2.00 2.00 2.33
18-21UT 2.00 2.00 2.33
21-00UT 2.33 2.33 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 Jun 01-Jun 03 2026

Jun 01 Jun 02 Jun 03
S1 or greater 5% 5% 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 Jun 01-Jun 03 2026

Jun 01 Jun 02 Jun 03
R1-R2 25% 25% 20%
R3 or greater 5% 5% 1%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
on 01-02 Jun, with a slight chance for R1-R2 events on 03 Jun.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
* Origin: Outpost BBS * Johnson City, TN (618:618/1)