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.

Clear skies over Chicago could create favorable conditions to see the aurora borealis, forecasters say. By Monday, the chance of seeing the lights drops significantly. The lights are visible thanks to a geomagnetic storm caused by a coronal mass ejection passing over Earth.