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.

The National Weather Service's Storm Prediction Center warned of "near historic" fire conditions in the Plains.

At a press conference in Mannford Saturday morning, Gov. Kevin Stitt said more than 170 thousand acres had burned and more than 293 homes and structures were destroyed across the state during Friday's destructive wildfire storms.