The National Oceanic and Atmospheric Administration issued the rare warning, its first in nearly 20 years, following days of intense solar activity.

The National Oceanic and Atmospheric Administration’s Space Weather Prediction Center forecasted a “severe solar storm” that’s expected to hit Earth tonight, according to a release. These geomagnetic storms happen every so often,

Earth is under a severe (G4) geomagnetic storm watch for the first time in nearly 20 years. The NOAA Space Weather Prediction Center issued a severe (G4) geomagnetic storm watch on Thursday, May 9, for the first time since January 2005.