The same storm produced baseball-sized hail. The rotating thunderstorm churned over entirely empty prairie lands.

Supercells are the mightiest of the thunderstorms. They can roll for hours while maintaining tornadoes and damaging hail.

A supercell thunderstorm, which brought almost hurricane-force straight-line winds, was responsible for a 300-mile swath of damage across northern Maryland and southern Pennsylvania on Saturday ...

Pottawattamie, Cass CountiesOne supercell storm produced multiple tornadoes north of Omaha before crossing into Pottawattamie County, Iowa. A spotter reported a possible tornado southeast of ...

An ordinary thunderstorm in the middle of summer can produce lightning and a heavy downpour. But within an hour or less, it rains itself out and fizzles. Supercell thunderstorms, however ...