AccuWeather video shows a tornado near St. Libory, Nebraska, spinning beneath a large, well-defined mesocyclone as severe ...

A supercell is a thunderstorm that is characterized by the presence of a mesocyclone: a deep, persistently rotating updraft. Supercells are typically also classified as severe thunderstorms, and ...

This post assumes you have read Severe Weather Primer Parts 1 - 7. The image below marks a monumental date in the history of severe storms meteorology.It was April 9, 1953 that the first hook echo was ...

Supercell just getting its wind up over South Dakota. Note the colors (explained below). Photo by Nicolaus Wegner, from the video On June 1, 2015, photographer Nicolaus Wegner was in South Dakota and ...

National Geographic Traveler just announced its winners for its 2014 photo contest. The shots are all very cool, but I can’t argue with the No. 1 pick: a mesocyclone over Colorado, taken by ...