The storms could be accompanied by hail or damaging winds and have the highest chance of forming on Tuesday evening.

Severe storms were expected to rip across parts of the northern U.S. on Monday, bringing numerous hazards to multiple states.

Millions of Americans are under weather advisories this week. See which major cities have heat, flood or storm advisories.

Des Moines, Iowa, Bismarck, North Dakota, and Rapid City, South Dakota, are also at risk for severe storms today, Merrill said. Merrill said primary threats include hail, isolated tornadoes and ...

All modes of severe weather are possible with any supercell storms that develop. More severe weather is expected tomorrow. Some of this outlook will depend on how tonight’s thunderstorms evolve.