A geomagnetic storm could impact Earth’s atmosphere this week, and if it does, it could trigger a Northern Lights show over the Chicago area.

The Space Weather Prediction Center issued a G2/G3 geomagnetic storm watch on Sunday, estimating the effects of a coronal mass ejection could begin impacting Earth on Monday afternoon and continue to do so through Tuesday morning.

Currently the storm watch is a G2/G3 level on the Planetary K-index scale, but the SWPC says there is a chance for a G4-level event, which could push make the Northern Lights visible across wide swaths of the United States.

A full-halo CME was observed 30 Aug. It is expected to arrive at Earth late afternoon of 1 Sep EDT and continue into early morning of 2 Sep. Confidence of Earth arrival is high, timing and intensity c

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