Supercells loom large in Canada's skies during the summer months. These intense thunderstorms are responsible for some of the worst severe weather you can experience, capable of producing significant ...

The warm front moving north through Michigan may spark a couple of isolate, but fairly large, thunderstorms this evening. Those few supercell thunderstorms may produce a tornado or two.

With little rain to obscure the view, an enormous spiraling thunderstorm created an otherworldly scene as the sun set in ...

This radar loop shows the supercell thunderstorm, which produced at least one deadly tornado in Nashville, tracking across the state of Tennessee from 10 p.m. on March 2 to 4 a.m. on March 3.

CHICAGO (WLS) -- A supercell thunderstorm ripped through the Chicago area Monday evening, leaving a trail of wind damage that stretched from the far northwest suburbs to Indiana. The storm traveled ...

Thunderstorms need moisture, energy — which meteorologists call instability — and some sort of lift to form. Usually, the lift comes from cold and warmer air masses colliding along a line called a ...