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.

The Storm Prediction Center has shifted the widespread severe weather threat just a little to the northeast, putting the very southwest corner of Lower Michigan in the chance of damaging wind gusts and even a strong tornado.

A powerful storm system sweeping through the central and southern United States has resulted in the deaths of at least 33 people.