| TYPE | RADIO BLACKOUT | SOLAR STORM | GEO STORM |
|---|---|---|---|
| SCALE | 1-2: 1%, 3-5: 15% | 1% | 0 |
| TEXT | None | S1 or < | none |
| 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% | 0 |
| TEXT | None | S1 or < | none |
:Product: 3-Day Forecast
:Issued: 2026 Jun 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Jun 17-Jun 19 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Jun 17-Jun 19 2026
Jun 17 Jun 18 Jun 19
00-03UT 3.00 3.33 3.00
03-06UT 2.00 3.00 4.00
06-09UT 2.00 2.33 3.67
09-12UT 1.67 2.00 3.00
12-15UT 1.33 1.67 3.00
15-18UT 2.67 1.33 2.00
18-21UT 4.00 1.33 1.67
21-00UT 3.00 2.67 3.00
Rationale: No G1 (Minor) or greater geomagnetic storms are expected
through 19 Jun.
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 17-Jun 19 2026
Jun 17 Jun 18 Jun 19
S1 or greater 1% 1% 1%
Rationale: No S1 (Minor) or greater solar radiation storms are expected
through 19 Jun.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Jun 17-Jun 19 2026
Jun 17 Jun 18 Jun 19
R1-R2 15% 15% 15%
R3 or greater 1% 1% 1%
Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio
blackouts through 19 Jun.
Updated last 2026/06/17 06:40 UTC
-------------------
Product ID: EF3A
Issued: 2026-06-16 11:24:14.140
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3702
Issue Time: 2026 Jun 16 1124 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu\nContinuation of Serial Number: 3701\nBegin Time: 2026 Jun 13 1332 UTC\nYesterday Maximum 2MeV Flux: 1489 pfu\n
\n
-------------------
Product ID: EF3A
Issued: 2026-06-15 12:35:56.833
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3701
Issue Time: 2026 Jun 15 1235 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu\nContinuation of Serial Number: 3700\nBegin Time: 2026 Jun 13 1332 UTC\nYesterday Maximum 2MeV Flux: 1581 pfu\n
\n
-------------------
Product ID: EF3A
Issued: 2026-06-14 13:28:09.427
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3700
Issue Time: 2026 Jun 14 1328 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu\nContinuation of Serial Number: 3699\nBegin Time: 2026 Jun 13 1332 UTC\nYesterday Maximum 2MeV Flux: 1520 pfu\n
\n
-------------------
Product ID: A30F
Issued: 2026-06-14 08:30:13.163
Message Follows:
Space Weather Message Code: WATA30
Serial Number: 276
Issue Time: 2026 Jun 14 0830 UTC
CANCELLED WATCH: Geomagnetic Storm Category G2 Predicted \nCancel Serial Number: 275\nOriginal Issued Time: 2026 Jun 11 2029 UTC\nG1 (Minor) geomagnetic storm conditions are no longer expected.
\nG1 (Minor) geomagnetic storm conditions are no longer expected.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
-------------------
Product ID: K04W
Issued: 2026-06-13 23:56:02.700
Message Follows:
Space Weather Message Code: WARK04
Serial Number: 5365
Issue Time: 2026 Jun 13 2356 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected\nExtension to Serial Number: 5364\nValid From: 2026 Jun 13 0126 UTC\nNow Valid Until: 2026 Jun 14 0600 UTC\nWarning Condition: Persistence\n
\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 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: K04A
Issued: 2026-06-13 21:01:31.343
Message Follows:
Space Weather Message Code: ALTK04
Serial Number: 2666
Issue Time: 2026 Jun 13 2101 UTC
ALERT: Geomagnetic K-index of 4 \nThreshold Reached: 2026 Jun 13 2059 UTC\nSynoptic Period: 1800-2100\nActive Warning: YES\nComment:
\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 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: 2026-06-13 13:33:56.463
Message Follows:
Space Weather Message Code: ALTEF3
Serial Number: 3699
Issue Time: 2026 Jun 13 1333 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu \nThreshold Reached: 2026 Jun 13 1332 UTC\nStation: GOES-19\nComment:
\n
-------------------
Product ID: K04W
Issued: 2026-06-13 01:27:47.840
Message Follows:
Space Weather Message Code: WARK04
Serial Number: 5364
Issue Time: 2026 Jun 13 0127 UTC
WARNING: Geomagnetic K-index of 4 expected \nValid From: 2026 Jun 13 0126 UTC\nValid To: 2026 Jun 13 2359 UTC\nWarning Conditions: Onset\nComment:
\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 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: K05A
Issued: 2026-06-11 20:40:33.250
Message Follows:
Space Weather Message Code: ALTK05
Serial Number: 2027
Issue Time: 2026 Jun 11 2040 UTC
ALERT: Geomagnetic K-index of 5 \nThreshold Reached: 2026 Jun 11 2040 UTC\nSynoptic Period: 1800-2100\nActive Warning: YES\nNoaa Scale: G1 - Minor\nComment:
\nNOAA Scale: G1 - Minor
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: A30F
Issued: 2026-06-11 20:29:33.070
Message Follows:
Space Weather Message Code: WATA30
Serial Number: 275
Issue Time: 2026 Jun 11 2029 UTC
WATCH: Geomagnetic Storm Category G2 Predicted \nHighest Storm Level Predicted by Day:\nJun 12: G1 (Minor) Jun 13: G2 (Moderate) Jun 14: G1 (Minor) \nTHIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT\nComment:
\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 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
-------------------
Product ID: K05W
Issued: 2026-06-11 20:15:04.513
Message Follows:
Space Weather Message Code: WARK05
Serial Number: 2241
Issue Time: 2026 Jun 11 2015 UTC
WARNING: Geomagnetic K-index of 5 expected \nValid From: 2026 Jun 11 2014 UTC\nValid To: 2026 Jun 12 0300 UTC\nWarning Conditions: Onset\nNoaa Scale: G1 - Minor\nComment:
\nNOAA Scale: G1 - Minor
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.
Current 2026 Jun 16 1205 UTC
Solar-terrestrial indices for 15 June follow.
Solar flux 117 and estimated planetary A-index 6.
The estimated planetary K-index at 1200 UTC on 16 June was 1.33.
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 #26-23
2026 June 14 at 9:02 p.m. MDT (2026 June 15 0302 UTC)
**** SPACE WEATHER OUTLOOK ****
Summary For June 8-14
- G1 (Minor) geomagnetic storrming was observed on 11 Jun due to negative polarity CH HSS and weak CME effects.
- No R1 or greater events were observed during the period.
- No S1 or greater solar radiation storm events were observed during the period.
Outlook For June 15-21
No G1 or greater Geomagnetic storms are expected during the period, barring significant CME activity.
No S1 or greater solar radiation storms are expected during the period, barring significant solar flare activity.
-Increasing chances for R1-R2 (Minor-Moderate) events are anticipated after 20 Jun with the expected return of old Region 4455.