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.

America has been hit with a series of tornados throughout Saturday morning, and forecasters warn more could be don't heir way later on in the day.

The weather service said all forms of severe weather are possible, with strong to violent, long-track tornadoes being the main threat.