Geomagnetic Storm Forecast

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3-Day Forecast - 2024 May 17 0030 UTC

:Product: 3-Day Forecast
:Issued: 2024 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 2024 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown May 17-May 19 2024

             May 17       May 18       May 19
00-03UT       3.67         2.67         2.33     
03-06UT       4.00         2.33         3.00     
06-09UT       3.00         2.67         4.00     
09-12UT       2.33         1.67         4.00     
12-15UT       2.33         2.00         2.67     
15-18UT       2.33         1.67         2.33     
18-21UT       2.67         1.67         2.00     
21-00UT       3.00         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
above S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 17-May 19 2024

              May 17  May 18  May 19
S1 or greater   25%      5%      5%

Rationale: S1-S2 (Minor-Moderate) conditions are at a chance 17 May due
to the flare potential from now departed Region 3664. Probabilities drop
to a nominal levels on 18-19 May from the remaining active regions on
the Suns visible disk.

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 2024 0804 UTC.

Radio Blackout Forecast for May 17-May 19 2024

              May 17        May 18        May 19
R1-R2           40%           40%           40%
R3 or greater   10%           10%           10%

Rationale: A chance for R1-R2 (Minor-Moderate) conditions and a slight
chance for R3 (Strong) exist 17-19 May.
                        

3-Day Forecast - 2024 May 16 0030 UTC

:Product: 3-Day Forecast
:Issued: 2024 May 16 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 16-May 18 2024 is 4.33 (below NOAA
Scale levels).

NOAA Kp index breakdown May 16-May 18 2024

             May 16       May 17       May 18
00-03UT       3.67         2.33         2.33     
03-06UT       3.00         1.33         1.67     
06-09UT       2.67         1.67         2.00     
09-12UT       2.33         1.67         2.33     
12-15UT       2.00         2.33         2.33     
15-18UT       2.33         2.33         2.33     
18-21UT       2.33         3.33         2.33     
21-00UT       2.33         4.33         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
above S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 16-May 18 2024

              May 16  May 17  May 18
S1 or greater   99%     15%     10%

Rationale: R1-R2 (Minor-Moderate) conditions are expected on 16 May due
to the flare potential from now departed Region 3664. Probabilities drop
to a slight chance on 17-18 May from the remaining active regions on the
Suns visible disk.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R3 levels were observed over the past 24
hours. The largest was at May 15 2024 0837 UTC.

Radio Blackout Forecast for May 16-May 18 2024

              May 16        May 17        May 18
R1-R2           75%           40%           40%
R3 or greater   40%           10%           10%

Rationale: R1-R2 (Minor-Moderate) conditions are expected on 16 May due
to the flare potential from now departed Region 3664. Probabilities drop
to a chance on 17-18 May from the remaining active regions on the Suns
visible disk.
                        

3-Day Forecast - 2024 May 15 0030 UTC

:Product: 3-Day Forecast
:Issued: 2024 May 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 15-May 17 2024 is 5.00 (NOAA Scale
G1).

NOAA Kp index breakdown May 15-May 17 2024

             May 15       May 16       May 17
00-03UT       5.00 (G1)    2.33         2.33     
03-06UT       3.67         2.00         1.33     
06-09UT       3.00         2.67         1.67     
09-12UT       2.33         2.33         1.67     
12-15UT       2.67         2.00         2.33     
15-18UT       2.33         2.67         2.33     
18-21UT       2.67         3.00         3.33     
21-00UT       3.00         2.33         4.33     

Rationale: G1 (Minor) geomagnetic storms are likely on 15 May as CME
influence wanes.

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 May 15-May 17 2024

              May 15  May 16  May 17
S1 or greater   99%     25%     15%

Rationale: S1 (Minor) solar radiation storms are expected on 15 May
14 May with a chance on 16 May and a slight chance on 17 May due to the
eruptive potential from now departed Region 3664.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R3 levels were observed over the past 24
hours. The largest was at May 14 2024 1651 UTC.

Radio Blackout Forecast for May 15-May 17 2024

              May 15        May 16        May 17
R1-R2           75%           40%           35%
R3 or greater   40%           15%           10%

Rationale: R1-R2 (Minor-Moderate) conditions are expected on 15 May due
to the flare potential from now departed Region 3664. Probabilities drop
to a chance on 16-17 May from the remaining active regions on the Suns
visible disk.
                        

3-Day Forecast - 2024 May 14 0030 UTC

:Product: 3-Day Forecast
:Issued: 2024 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 6 (NOAA Scale
G2).
The greatest expected 3 hr Kp for May 14-May 16 2024 is 5.67 (NOAA Scale
G2).

NOAA Kp index breakdown May 14-May 16 2024

             May 14       May 15       May 16
00-03UT       3.67         5.00 (G1)    2.33     
03-06UT       3.33         3.67         2.00     
06-09UT       2.67         3.00         2.67     
09-12UT       2.33         2.33         2.33     
12-15UT       2.33         2.67         2.00     
15-18UT       4.67 (G1)    2.33         2.67     
18-21UT       5.67 (G2)    3.00         3.00     
21-00UT       4.33         3.00         2.33     

Rationale: G1-G2 (Minor-Moderate) geomagnetic storms are likely on 14 
May and G1 conditions are likely on 15 May as CME influence wanes.

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 May 14-May 16 2024

              May 14  May 15  May 16
S1 or greater   99%     25%      5%

Rationale: S1 (Minor) solar radiation storms are expected on 14 May with
a chance on 15 May due to the eruptive potential from Region 3664.


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 13 2024 0944 UTC.

Radio Blackout Forecast for May 14-May 16 2024

              May 14        May 15        May 16
R1-R2           80%           40%           40%
R3 or greater   40%           10%           10%

Rationale: R1-R3 (Minor-Strong) conditions are expected on 14 May due
to the flare potential of Region 3664. As the region rotates around the
Suns W limb, R1-R2 (Minor-Moderate) probabilities drop to just a chance
from the remaining active regions on the Suns visible disk.
                        

3-Day Forecast - 2024 May 13 0030 UTC

:Product: 3-Day Forecast
:Issued: 2024 May 13 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 7 (NOAA Scale
G3).
The greatest expected 3 hr Kp for May 13-May 15 2024 is 6.67 (NOAA Scale
G3).

NOAA Kp index breakdown May 13-May 15 2024

             May 13       May 14       May 15
00-03UT       6.67 (G3)    3.67         3.67     
03-06UT       5.67 (G2)    4.67 (G1)    3.67     
06-09UT       4.67 (G1)    3.67         2.67     
09-12UT       4.00         3.00         2.33     
12-15UT       3.67         2.67         2.33     
15-18UT       3.00         2.00         1.00     
18-21UT       3.00         2.00         2.33     
21-00UT       3.67         3.67         2.67     

Rationale: G3 (Strong) geomagnetic storms are expected on 13 May due to
ongoing CME activity. Continuing, but weaker CME influences are
anticipated to decrease responses down to unsettled to G1 (Minor) levels
on 14 May.

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 May 13-May 15 2024

              May 13  May 14  May 15
S1 or greater   60%     60%      5%

Rationale: S1 (Minor) or greater solar radiation storms remain likely
due primarily to the enhanced solar energetic particle environment, and
favorable location and potential of Region 3664 for future events 13-14
May.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R3 levels were observed over the past 24
hours. The largest was at May 12 2024 1626 UTC.

Radio Blackout Forecast for May 13-May 15 2024

              May 13        May 14        May 15
R1-R2           95%           95%           15%
R3 or greater   75%           75%            5%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected 13-14
May, with some likelihood of further R3 (Strong) events due primarily to
the flare potential of Region 3664.
                        

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