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 dynamic storm from Friday through Sunday had earned an unusual “high risk” designation from weather forecasters.

President Donald Trump has activated the National Guard in tornado-struck Arkansas after storms ripped through multiple states over the weekend, leaving at least 37 dead.

Multiple people have died amid an outbreak of severe weather across the South that forecasters warn could include "violent" tornadoes, high winds, thunderstorms and flash flooding on Saturday. Two people died and others were injured in a suspected tornado that touched down in the Bakersfield area of southern Missouri,