May 18, 2021 10:13 PM EDT Fortunately, the storm is expected to be weak, with G1-class conditions predicted by the National Weather Service's Space Weather Prediction Center. (Photo : ipicgr on Pixabay) (Photo : NOAA) Geomagnetic storms are rated 1 to 5, with 1 being the weakest and 5 being the most dangerous. With the possibility of a G1 geomagnetic storm, there could be slight power grid disturbances and minor impacts on satellite operations. Aurora, also known as the "Northern Lights," can be seen from northern Michigan and Maine to points north at high latitudes. May 14 Geomagnetic Storm (Photo : Pixabay) This new geomagnetic storm threat is being driven by a coronal hole formed on the Sun on May 14 and the energy associated with it. Last night, an irrelevant solar wind from another coronal mass ejection reached Earth, but the effects were minor.