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NOAA Space Weather Prediction Center @NWSSWPC

Safeguarding society with actionable space weather information.

Joined August 2015
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G2 Watch for 13 Jun UTC-day. We have high confidence in timing, but less confidence regarding intensity. Why is that, how do we make those forecasts and determinations, and what next? Check out this latest SWPC video from 11 June get answers to these questions.
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WARNING: Geomagnetic K-index of 5 expected Valid From: 2026 Jun 11 2014 UTC Valid To: 2026 Jun 12 0300 UTC Warning Conditions: Onset Noaa Scale: G1 - Minor Comment: NOAA Scale: G1 - Minor Issue Time: 2026 Jun 11 2015 UTC bit.ly/3wVgAKH

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SOLAR-1 is now operational! The new SOLAR-1 observations can be seen on our webpage at swpc.noaa.gov/products/ The full NOAA statement about SOLAR-1 now being operational is at noaa.gov/news-release/noaas-…
SOLAR-1 now Operational!

ALT SOLAR-1 now Operational!

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swpc.noaa.gov/products/solar… is the full link directly to the new solar wind observations that includes SOLAR-1
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Learn more about SOLAR-1 and how to see the observations of the solar wind from our new NOAA operational spacecraft by watching this SWPC video posted 10 June, 2026 @NWSWPC @NOAA @NOAASatellites
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WATCH: Geomagnetic Storm Category G3 Predicted Highest Storm Level Predicted by Day: Jun 07: None (Below G1) Jun 08: G3 (Strong) Jun 09: G2 (Moderate) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT Comment: Issue Time: 2026 Jun 06 2211 UTC bit.ly/3wVgAKH

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A G3 geomagnetic storm Watch has been issued for 8 Jun, and a G2 geomagnetic storm Watch has been issued for 9 Jun for the anticipated arrival of the CME that left the Sun on 6 Jun. Stay tuned for updates!
WSA Enlil model run and explanations of CME impacts

ALT WSA Enlil model run and explanations of CME impacts

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AR 4461 produced an M1.8 flare at 06/1401 UTC. This event was associated with a filament eruption and subsequent CME of which analysis and modeling is currently underway. An Earth-directed component is currently anticipated and would likely arrive on June 8th by rough estimates.
M1.8 Flare from AR 4461 and Filament Eruption

ALT M1.8 Flare from AR 4461 and Filament Eruption

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EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 2239 Valid From: 2026 Jun 05 1228 UTC Now Valid Until: 2026 Jun 06 1500 UTC Warning Condition: Persistence NOAA Scale: G1 - Minor Issue Time: 2026 Jun 06 0435 UTC bit.ly/3wVgAKH
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G2 geomagnetic storm levels reached following the likely arrival of the anticipated CME(s) from 3 Jun. Stay tuned for updates!
G2 Alert conditions explained. Current Ovation model

ALT G2 Alert conditions explained. Current Ovation model

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EXTENDED WARNING: Geomagnetic K-index of 6 expected Extension to Serial Number: 661 Valid From: 2026 Jun 05 1437 UTC Now Valid Until: 2026 Jun 06 0300 UTC Warning Condition: Persistence NOAA Scale: G2 - Moderate Issue Time: 2026 Jun 05 1721 UTC bit.ly/3wVgAKH

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EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 2238 Valid From: 2026 Jun 05 1228 UTC Now Valid Until: 2026 Jun 06 0600 UTC Warning Condition: Persistence NOAA Scale: G1 - Minor Issue Time: 2026 Jun 05 1719 UTC bit.ly/3wVgAKH

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WARNING: Geomagnetic K-index of 7 or greater expected Valid From: 2026 Jun 05 1714 UTC Valid To: 2026 Jun 05 2359 UTC Warning Conditions: Onset Noaa Scale: G3 - Greater Comment: NOAA Scale: G3 - Greater Issue Time: 2026 Jun 05 1716 UTC bit.ly/3wVgAKH

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WARNING: Geomagnetic K-index of 6 expected Valid From: 2026 Jun 05 1437 UTC Valid To: 2026 Jun 05 2100 UTC Warning Conditions: Onset Noaa Scale: G2 - Moderate Comment: NOAA Scale: G2 - Moderate Issue Time: 2026 Jun 05 1441 UTC bit.ly/3wVgAKH

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A minor (G1) storm alert has been issued as the expected disturbance reaches Earth.
Description of a Minor storm alert accompanied by an image of a time-series plot of solar wind data from SOLAR-1 spacecraft

ALT Description of a Minor storm alert accompanied by an image of a time-series plot of solar wind data from SOLAR-1 spacecraft

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WARNING: Geomagnetic K-index of 5 expected Valid From: 2026 Jun 05 1228 UTC Valid To: 2026 Jun 05 2100 UTC Warning Conditions: Onset Noaa Scale: G1 - Minor Comment: NOAA Scale: G1 - Minor Issue Time: 2026 Jun 05 1230 UTC bit.ly/3wVgAKH

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The current forecast calls for combined CME arrival around mid-afternoon EDT of June 4, with up to G3 levels possible afterwards. CME passage would likely continue into the evening and possibly overnight hours of June 5. Stay aware at spaceweather.gov
UPDATE on G3 Watch for 4-5 June 2026

ALT UPDATE on G3 Watch for 4-5 June 2026

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There is still great uncertainty regarding the timing and intensity of the CMEs here at Earth. We appear to be dealing with at least 3 CMEs, one of which is faster than the others, so a combination event is likely. Keep visiting spaceweather.gov for the latest.

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We know how much you appreciate the video updates, but we are unable to do one today about the CMEs and G3 Watch due to higher support priorities. However, we will try to do a video update early Thursday morning. Meanwhile, stay updated on our webpage at spaceweather.gov

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Geomagnetic Storm Watch (G3) for Jun 04-05 UTC-day in effect.
A slide describing the G3 watch that is in effect for 04-05 June 2026 (UTC)

ALT A slide describing the G3 watch that is in effect for 04-05 June 2026 (UTC)

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