Thunderstorms

Online 18.1: An MCS Squall Line A mature squall line produces strong-straight lined winds associated with a bow echo as it moves over Missouri.
Online 18.2: Parallel Squall Lines: Multiple squall lines developed across Illinois on 25 June 1997, when outflow from an original squall line triggered new convection. This process repeated throughout the day with three distinct squall lines visible on Doppler radar by 2300 UTC. Courtesy of Brian Jewett, University of Illinois
Online 18.3: Vertical Wind Shear and Storm Structure: A numerical model shows the development of a thunderstorm. Courtesy of Brian Jewett, University of Illinois
Online 18.4: Views of Supercells: Examine photos of supercell thunderstorms from a distance and up close. Photos courtesy of Brian Jewett, University of Illinois
Online 18.5: Record-Breaking Supercell on March 12, 2006: Radar animations with warning during a supercell thunderstorm outbreak illustrate the large number of warnings that can be issued simultaneously. Photos courtesy of Brian Jewett, University of Illinois

Related Web Sites
Storm Prediction Center	Monitor severe weather conditions by reading discussions and outlooks provided by the Storm Prediction Center.
About Derechos	Overview of Derechos (types, climatology, historic events)
Storm Spotters Guide	Learn how to identify severe storms.
WW2010 Guide to Severe Storms	Familiarize yourself with research into severe storms including how storms are modeled and how the results are visualized.
Thunderstorm Fact Sheet from FEMA	Learn what to do before and during a severe thunderstorm.