Strong-to-severe thunderstorms will be a big concern for the southern Plains and the Mississippi and Ohio valleys through Friday, with a possible tornado outbreak.  

The threat of severe storms in the Plains, Ohio and Mississippi Valleys

A severe storm threat on Friday in the Plains, Ohio and Mississippi Valleys (Credit: Fox News)

ARMY CORP INVESTIGATING NEW ORLEANS FLOOD PROTECTION SYSTEM AFTER DRAINAGE PUMP CORRODED IN 5 YEARS

Stormy spring weather in the southern U.S.

Stormy spring weather in the southern U.S. on Thursday (Credit: Fox News)

Record-setting warmth will help fuel storms ahead of this system, bringing widespread heavy rain and the risk of flash flooding.  

Rain in the Midwest, Great Lakes and Northeast

Rain still forecast through Saturday night in the Midwest, Great Lakes and Northeast (Credit: Fox News)

On the northern side of the storm, late-season snow will pile up over sections of the Great Lakes, Northeast and New England.  

The futuretrack in the Northeast, New England and Great Lakes

The futuretrack in the Northeast, New England and Great Lakes on Saturday afternoon (Credit: Fox News)

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Snow still forecast in the West

Snow still forecast in the West through Sunday morning (Credit: Fox News)

Meanwhile, more unsettled weather is in the forecast across the West, with colder-than-average temperatures and upcoming heavy snow for the mountains.