More geomagnetic storm conditions are forecast for later in the week, pulling the aurora borealis farther south, though some states will likely have an earlier chance to see the phenomenon Thursday, according to the National Oceanic and Atmospheric Administration.

The aurora's are back! And may be visible throughout the weekend. The University of Alaska and NOAA track auroras using the Kp-index , a global auroral activity indicator which has a scale from 0 to 9. It measures the fluctuations in the Earth's magnetic field, tied to specific geographic locations.