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 ...

The most destructive and deadly tornados occur in supercells – rotating thunderstorms with a well-defined circulation called a mesocyclone. Collection and processing of in situ data pertaining to ...

A major incident has been declared and around 100 properties damaged after a suspected tornado struck Greater Manchester, with a second “supercell thunderstorm“ hitting Lancashire hours later.

Giant supercell thunderstorm terrified residents as it made its way across the High Plains in Nebraska Incredible shots were taken just a day after a team of photographers captured footage of ...

The alert warned that, at 7:50pm. A supercell structure observed at Mt Gravatt a short time ago. Photo: Jason/Higgins Storm Chasing Golf ball sized hail stones from Fortitude Valley in Brisbane.