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 ...
A colossal storm cloud swept through Sorocaba, São Paulo, on Wednesday, leaving locals stunned by its dramatic and foreboding appearance. Identified as a supercell with a mesocyclone, the cloud ...
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