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A supercell thunderstrom in Oklahoma. Image courtesy of NSSL/NOAA. The National Weather Service defines a severe thunderstorm as a thunderstorm that is producing: Hail that is at least quarter ...

Scotts Valley residents express concerns over the lack of a tornado warning before a rare twister touched down.

A "supercell" storm of heavy showers, hail and thunder left parts of Yorkshire under a thick blanket of hailstones on Thursday evening. The storms, which began at about 16:00 BST, battered much of ...