GEOMAGNETIC STORM WATCHES FOR 9 - 11 DECEMBER, 2020
Geomagnetic Storm Watches are in effect from December 9th - 11th, 2020 due to anticipated CME effects. The CME occurred on December 7th, and was associated with a C7 flare from Region 2790. Analysis suggests CME arrival possible late on 9 December, initially resulting in G1 (Minor) storm levels. As CME effects continue, activity is likely to increase, especially if the magnetic field carried with the CME connects well with Earth's magnetosphere. Therefore, the potential for strong storm levels exists and a G3 (Strong) Watch is in effect for December 10th. CME-related disturbances are forecast to continue into 11 December, likely resulting in G2 (Moderate) storm levels - and another Watch has been issued accordingly. While SWPC forecasters are fairly confident in CME arrival at Earth, timing and geomagnetic storm intensity are less certain. Continue to monitor our SWPC webpage for the latest conditions and forecast.
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