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Squall Line with Straight-Line Winds on 15 April 1994:
A bow echo is seen on an animation of Doppler radar reflectivity
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Squall Lines Developing from Outflow Along a Gust Front:
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
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Simulation of a Thunderstorm Forming in a Weak-Shear Environment:
A numerical model shows the development of a thunderstorm in a weak-shear environment.
The white area denotes cloud water. Arrows on the surface denote wind direction; speed is denoted by
color with faster colors being yellow and red. After 7200 seconds (120 minutes)
the thunderstorm has dissipated.
Courtesy of Brian Jewett, University of Illinois
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Simulation of a Thunderstorm Forming in a Strong-Shear Environment:
A numerical model shows the development of a thunderstorm in an environment with strong wind shear.
The white area denotes cloud water. Arrows on the surface denote wind direction; speed is denoted
by color with faster colors being yellow and red. After 7200 seconds (120 minutes) the cloud has developed into
a well structured thunderstorm that may be severe.
Courtesy of Brian Jewett, University of Illinois
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Views of Supercell Thunderstorms:
Examine photos of supercell thunderstorms from a distance and up close.
Photos courtesy of Brian Jewett, University of Illinois
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