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.

A supercell is a long-lived thunderstorm with a rotating updraft that can produce extreme weather like large hail, damaging ...

Spring and summer are typically when more storms occur, with the most destructive type — supercell thunderstorms — also more ...

The Prairies will be a hot spot of severe weather opportunity this week. Wednesday and Thursday will see a risk of severe thunderstorms in parts of the region, with both days featuring the chances of ...

No, it’s not the name of a lotto draw or a football round – this “supercell Saturday” could bring gale-force winds, hail the size of golf balls, heavy rain and flash flooding to Brisbane for the third ...

GRAND FORKS – After anticipating a round of severe weather going into Thursday evening and Friday morning, the National Weather Service in Grand Forks is still eyeing the possibility of more stormy ...

"We saw rainfall upwards of half an inch in 10 to 15 minutes," a National Weather Service meteorologist told The Arizona Republic.