Editor’s Note: Wednesday afternoon, the National Weather Service confirmed at least one tornado touched down Tuesday near Wheatfield, Indiana, with peak winds near 110 mph, ranking as an EF-1 in ...

In about 15 minutes, Tempe recorded nearly three-quarters of an inch of rain. A supercell thunderstorm forms when wind speed and direction change with height, a phenomenon called wind shear.

Severe storms eyeing the Chicago area Tuesday have the potential to produce supercells, considered to be one of the most ...