A Comprehensive Glossary of Weather Terms for Storm Spotters -- A National Weather Service website produced by the Forecast Office in Norman, Oklahoma.

National Severe Storms Laboratory -- The National Severe Storms Laboratory is part of the National Oceanic and Atmospheric Administration.

Resources: Thunderstorms -- A USA Today website.

Severe Weather -- A National Oceanic and Atmospheric Administration website.

Storm Prediction Center -- A National Oceanic and Atmospheric Administration website.