Aurora chasers are on high alert for geomagnetic storm conditions overnight with northern lights possible at mid-latitudes.

Several northern U.S. states could see the northern lights Thursday as geomagnetic storm conditions are expected to continue affecting Earth’s magnetic field, according to the National Oceanic and Atmospheric Administration.

The other part of the good news is the timing of the possible northern lights. Notice that NOAA forecasts a Kp Index of 4 between 8 p.m. and 11 p.m. and then up to a Kp Index of 5 after 11 p.m.