Streaks of colorful light could paint the sky over a large portion of the country on Sunday night into Monday morning amid a severe geomagnetic storm.

Forecasting the northern lights, or aurora borealis, is tricky because it depends on space weather, which is far more unpredictable than regular weather here on Earth. The aurora

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.