A rotating supercell thunderstorm can hold ice aloft long enough to build hailstones wider than a grapefruit. Such stones are ...

The definition of a tornado is a rapidly rotating column of air, but tornadoes aren't the only weather phenomenon that match that description.

Not all thunderstorms can produce tornadoes - only about 30% of supercell thunderstorms actually spawn these rotating columns of air. Supercells are severe thunderstorms with intense, rotating ...

CORDELL, Okla. — Last Saturday afternoon, the air here smelled sweet and fresh. A mother ship supercell — a kind of rotating thunderstorm — loomed to my west. Raindrops began to fall that looked like ...

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 ...

Editor's note: This article has updated the status of weather alerts for Berkshire County. If you were planning outdoor activities in the Berkshires on Saturday, you likely had to reschedule. That's ...

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 ...