(10-30-21) A G3 (Strong) Geomagnetic Storm Watch is in effect for 30 – 31 October, 2021, following a significant solar flare and Coronal Mass Ejection (CME) from the sun that occurred around 11:35 a.m. EDT on Oct. 28. Analysis indicated the CME departed the Sun at a speed of 973 km/s and is forecast to arrive at Earth on 30 October, with effects likely continuing into 31 October.

When the CME approaches Earth, NOAA’s DSCOVR satellite will be among the first spacecraft to detect the real time solar wind changes and SWPC forecasters will issue any appropriate warnings.

Impacts to our technology from a G3 storm are generally nominal. However, a G3 storm has the potential to drive the aurora further away from its normal polar residence and if other factors come together, the aurora might be seen over the far Northeast, to the upper Midwest, and over the state of Washington.

What is a G3 geomagnetic storm?

A G3 (Strong) geomagnetic storm watch has been issued for October 30. These storms can add energy in the form of heat that can increase the density and distribution of density in the upper atmosphere, causing extra drag on satellites in low-earth orbit.