Millions of Americans across the country are on alert for a severe weather outbreak as violent, long-track tornadoes with damaging winds of up to 80 mph and large hail are expected across the Midwest and South with the cross-country storm moving east.

At least 37 people were reported dead over the weekend after storms and tornadoes wreaked havoc across multiple states. Reports of deaths related to the storm began on Friday, and dozens more were confirmed through the weekend, according to the Nationa Weather Service.

The Storm Prediction Center has placed most of the Chicago area under a Slight Risk (Level 2 of 5) for severe storms between 3 p.m. and 8 p.m. The primary threats include strong winds and hail, but a brief spin-up tornado cannot be ruled out.