WW2010
University of Illinois

WW2010
 
welcome
 
online guides
 
archives
 
educational cd-rom
 
current weather
 
about ww2010
 
index

Online Guides
 
introduction
 
meteorology
 
remote sensing
 
reading maps
 
projects, activities

Meteorology
 
introduction
 
air masses, fronts
 
clouds, precipitation
 
el nino
 
forces, winds
 
hurricanes
 
hydrologic cycle
 
light, optics
 
midlatitude cyclones
 
severe storms
 
weather forecasting

Severe Storms
 
introduction
 
dangers of t-storms
 
types of t-storms
 
tstorm components
 
tornadoes
 
modeling

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

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

User Interface
 
graphics
text

.
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.



components
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