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Severe Storms
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> types of t-storms
  tstorm components

Types of T-storms
  storm spectrum
  single cell storms
  multicell clusters
> multicell lines

Multicell Lines
> on satellite images
  along leading edge
  retreating lines
  linear radar echoes
  bow echoes
  more bow echoes

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On Satellite Images
squall lines and mesoscale convective systems

This infrared satellite view of an eastward moving squall line, extending from the Ohio River Valley southwestward into Louisiana, shows the extreme lengths that thunderstorm lines can achieve. The lower, warmer anvils on the north end of the line and the colder, higher cloud tops at the south end reveal the tendency for older, weakening storms to be shed on the north side of the line with newer and stronger development near the south end.

[Image: Infrared Satellite View of a Squall Line (69K)]

The second satellite photo shows a huge anvil cloud arising from a large cluster of storms. This is called a mesoscale convective system or "MCS". An entire MCS cannot be viewed from the ground and in some cases not even by a single radar, so we use the satellite perspective. It is a group of multicell storms, often dominated by a vigorous squall line on the downwind (east) side and a number of weaker multicell cluster storms in the interior.

[Image: Infrared Satellite View of a Mesoscale Convective System (73K)]

An MCS often will bring severe weather and heavy rain with the squall line, and additional heavy rainfall with the interior storms. A number of major flash floods have resulted from MCS passage, making this large storm complex an extremely important grouping of multicell thunderstorms to recognize.

Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.

along leading edge