Millions are on high alert for severe thunderstorms that could escalate into supercells over the next 24 hours, bringing the ...

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 ...

South East Queensland is set to be smashed by potentially severe thunderstorms with giant hail and destructive winds, the ...

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.

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