Add Yahoo as a preferred source to see more of our stories on Google. A giant supercell hovered in the sky over northwest Oklahoma, as the National Weather Service (NWS) warned of severe thunderstorms ...

A storm system could bring supercell thunderstorms, gusty winds and even the chance of tornadoes to the Chicago area Wednesday. According to the Storm Prediction Center, all of northern Illinois is at ...

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.

It looks like something out of The Wizard of Oz, but storm chasers have captured the terrifying formation of a tornado out of ...