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https://www.swpc.noaa.gov/news/g4-severe-watch-effect-12-november
G4 (Severe) Watch in Effect for 12 November
published: Tuesday, November 11, 2025 23:39 UTC


G4 (Severe) Watch in Effect for 12 November
published: Tuesday, November 11, 2025 23:39 UTC

Geomagnetic Storm Watches in Effect, to include G4 (Severe) potential for 12 November

The current list of Watches include: 11 Nov G2 (Moderate); 12 Nov G4 (Severe); and 13 Nov G3 (Strong)

These Watches are in response to potential geomagnetic storm effects related to coronal mass ejections (CME) that have erupted from the Sun over the past several days

These events include CME activity from 9 November through the early morning of 12 November

The most recent CME occurred early on 11 Nov and is the most energetic and fastest of the CMEs

This CME was associated with an X5.1 solar flare (R3; Strong) that peaked at 1004 UTC (5:04 am EST) on 11 Nov

This CME is also associated with a moderate level solar radiation storm (S2) that is currently in progress

The forecast is tough due to this latest CME’s predominant ejecta aimed north and ahead of Earth’s orbit; additionally the previous CMEs are in the mix and anticipated to have some Earth-arrival influences prior to the 12 Nov CME arrival

Confidence in an Earth-component to the most recent CME is high, while timing has a moderate level of certainty

As always with these events, the intensity of the CME will not be know with better certainty until it arrives 1 million miles from Earth and is observed by the solar wind observatories at that location

It is at that point that any needed Warning decisions can be made by SWPC forecasters

So, for now, SWPC believes there is a potential for G4 levels upon CME arrival and/or as the CME passage progresses. Stay space weather aware and follow the latest information, forecasts, and updates at https://spaceweather.gov


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Previously posted in Science
https://www.democraticunderground.com/122894430