| TYPE | RADIO BLACKOUT | SOLAR STORM | GEO STORM |
|---|---|---|---|
| SCALE | 1-2: 1%, 3-5: 1% | 1% | 0 |
| TEXT | None | S1 or < | minor |
| TYPE | RADIO BLACKOUT | SOLAR STORM | GEO STORM |
|---|---|---|---|
| SCALE | 0 | 0 | 0 |
| TEXT | none | none | none |
| TYPE | RADIO BLACKOUT | SOLAR STORM | GEO STORM |
|---|---|---|---|
| SCALE | 1-2: 1%, 3-5: 1% | 1% | 1 |
| TEXT | None | S1 or < | minor |
:Product: 3-Day Forecast
:Issued: 2026 Oct 30 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 Oct 30-Nov 01 2026 is 5.00 (NOAA Scale
G1).
NOAA Kp index breakdown Oct 30-Nov 01 2026
Oct 30 Oct 31 Nov 01
00-03UT 0.67 5.00 (G1) 3.67
03-06UT 0.67 4.67 (G1) 4.67 (G1)
06-09UT 0.67 4.33 3.33
09-12UT 0.33 4.00 2.67
12-15UT 0.33 3.00 2.33
15-18UT 0.67 3.00 3.33
18-21UT 1.67 3.67 3.67
21-00UT 1.67 4.00 3.33
Rationale: G1 (Minor) geomagnetic storms are likely on 31 Oct and 01 Nov
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 Oct 30-Nov 01 2026
Oct 30 Oct 31 Nov 01
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 Oct 30-Nov 01 2026
Oct 30 Oct 31 Nov 01
R1-R2 1% 1% 1%
R3 or greater 1% 1% 1%
Rationale: No R1 (Minor) or greater radio blackouts are expected. No
significant active region flare activity is forecast.
Updated last 2026/10/30 10:25 UTC
-------------------
Product ID: A20F
Issued: 2026-10-29 19:10:52.657
Message Follows:
Space Weather Message Code: WATA20
Serial Number: 1134
Issue Time: 2026 Oct 29 1910 UTC
WATCH: Geomagnetic Storm Category G1 Predicted \nHighest Storm Level Predicted by Day:\nOct 30: None (Below G1) Oct 31: G1 (Minor) Nov 01: G1 (Minor) \nTHIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT\nComment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
-------------------
Product ID: EF3A
Issued: 2026-10-29 16:14:35.270
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3761
Issue Time: 2026 Oct 29 1614 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu\nContinuation of Serial Number: 3760\nBegin Time: 2026 Oct 23 1140 UTC\n\nYesterday Maximum 2MeV Flux: 2493 pfu\nMax time: 2026 Oct 28 1805 UTC
-------------------
Product ID: A20F
Issued: 2026-10-28 16:38:01.100
Message Follows:
Space Weather Message Code: WATA20
Serial Number: 1133
Issue Time: 2026 Oct 28 1638 UTC
WATCH: Geomagnetic Storm Category G1 Predicted \nHighest Storm Level Predicted by Day:\nOct 29: None (Below G1) Oct 30: None (Below G1) Oct 31: G1 (Minor) \nTHIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT\nComment: G1 (Minor) geomagnetic storms are likely on 31 Oct primarily due to recurrent, positive polarity coronal hole high speed stream effects.\n
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
-------------------
Product ID: EF3A
Issued: 2026-10-28 09:23:11.410
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3760
Issue Time: 2026 Oct 28 0923 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu\nContinuation of Serial Number: 3759\nBegin Time: 2026 Oct 23 1140 UTC\n\nYesterday Maximum 2MeV Flux: 1789 pfu\nMax time: 2026 Oct 27 1715 UTC
-------------------
Product ID: EF3A
Issued: 2026-10-27 11:38:11.233
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3759
Issue Time: 2026 Oct 27 1138 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu\nContinuation of Serial Number: 3758\nBegin Time: 2026 Oct 23 1140 UTC\n\nYesterday Maximum 2MeV Flux: 3304 pfu\nMax time: 2026 Oct 26 1105 UTC
-------------------
Product ID: EF3A
Issued: 2026-10-26 05:17:56.783
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3758
Issue Time: 2026 Oct 26 0517 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu\nContinuation of Serial Number: 3757\nBegin Time: 2026 Oct 23 1140 UTC\n\nYesterday Maximum 2MeV Flux: 2864 pfu\nMax time: 2026 Oct 25 1820 UTC
-------------------
Product ID: EF3A
Issued: 2026-10-25 09:27:50.723
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3757
Issue Time: 2026 Oct 25 0927 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu\nContinuation of Serial Number: 3756\nBegin Time: 2026 Oct 23 1140 UTC\n\nYesterday Maximum 2MeV Flux: 3259 pfu\nMax time: 2026 Oct 24 1530 UTC
-------------------
Product ID: EF3A
Issued: 2026-10-24 09:04:23.307
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3756
Issue Time: 2026 Oct 24 0904 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu\nContinuation of Serial Number: 3755\nBegin Time: 2026 Oct 23 1140 UTC\n\nYesterday Maximum 2MeV Flux: 3169 pfu\nMax time: 2026 Oct 23 1540 UTC
-------------------
Product ID: K04A
Issued: 2026-10-23 19:55:04.007
Message Follows:
Space Weather Message Code: ALTK04
Serial Number: 2694
Issue Time: 2026 Oct 23 1955 UTC
ALERT: Geomagnetic K-index of 4 \nThreshold Reached: 2026 Oct 23 1953 UTC\nSynoptic Period: 1800-2100\nActive Warning: YES\nComment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
-------------------
Product ID: K04W
Issued: 2026-10-23 19:27:05.807
Message Follows:
Space Weather Message Code: WARK04
Serial Number: 5443
Issue Time: 2026 Oct 23 1927 UTC
WARNING: Geomagnetic K-index of 4 expected \nValid From: 2026 Oct 23 1926 UTC\nValid To: 2026 Oct 24 0900 UTC\nWarning Conditions: Onset\nComment:
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
-------------------
Product ID: EF3A
Issued: 2026-10-23 11:47:50.950
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3755
Issue Time: 2026 Oct 23 1147 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu \nThreshold Reached: 2026 Oct 23 1140 UTC\nStation: GOES-19\nComment:
Current 2026 Oct 29 1205 UTC
Solar-terrestrial indices for 28 October follow.
Solar flux 93 and estimated planetary A-index 7.
The estimated planetary K-index at 1200 UTC on 29 October was 0.33.
No space weather storms were observed for the past 24 hours.
No space weather storms are predicted for the next 24 hours.
Official Space Weather Advisory issued by NOAA Space Weather Prediction Center
Boulder, Colorado, USA
SPACE WEATHER ADVISORY OUTLOOK #26-41
2026 October 25 at 7:22 p.m. MDT (2026 October 26 0122 UTC)
**** SPACE WEATHER OUTLOOK ****
Summary For October 19-25
-G1 (Minor) geomagnetic storming was observed on 21 Oct due to positive polarity coronal hole/high speed stream influences.
Outlook For October 26-November 1
-G1 (Minor) geomagnetic storm periods are likely on31 Oct due to the anticipated influence of a recurrent positive polarity coronal hole/high speed stream.