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.

Meanwhile, the severe weather threat will linger through Sunday from Florida northward into the upper Ohio River Valley, forecasters warned.

Austin Police said at least five people died and 11 were hurt in a crash involving at least 17 vehicles, including semi-trucks, on Interstate 35 in north Austin late Thursday night. "We look forward to continued engagement ... to support public health, build consumer trust and promote consumer choice."