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.

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

At least 30 people died as violent weather swept the country on Friday and Saturday, and the threat isn't over.