WW2010
University of Illinois

WW2010
 
  welcome
 
> online guides
 
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  current weather
 
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  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

Supercells
 
  introduction
 
> on radar
 
  schematic diagrams
 
  features
 
  variations
 
  hp supercells
 
  lp supercells
 
  multicell to supercell
 
  tornadic supercell

User Interface
 
  graphics
> text

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On Radar Images
supercells tend to develop in isolation

Supercells most frequently are isolated and often develop in the warm air ahead of a squall line. This supercell formed south-southwest of the radar site and produced large hail and tornadoes well ahead of a broken to solid squall line.

[Image: radar image of supercell preceeding a squall line (63K)]

This supercell, north-northwest of the radar, developed within an east-west oriented solid squall line. It produced severe weather and funnel clouds, but no known tornadoes. Subjective experience suggests that such storms are not as likely to produce strong to violent tornadoes as are more isolated storms.

[Image: radar image of supercell embedded in squall line (86K)]

However, other evidence shows that storm spacing, which is necessary for significant tornado formation, is probably greater on the High Plains than that in the southeast U.S., possibly because of the abundant moisture near the Gulf of Mexico. Supercells frequently occur in "preferred" regions relative to other radar echoes. First, in this case of a scattered to broken line of thunderstorms, a supercell is evident due west of the radar site, positioned in a weakly-developed LEWP and north of a break in the line.

[Image: supercell in broken line of thunderstorms (87K)]

Surface data indicates that a small scale low pressure system, about 100 miles in diameter, probably accounted for the LEWP configuration. Supercells often form near or immediately northeast of such a low. The lack of other storms in the immediate vicinity of this supercell allowed the intense storm to produce tornadoes and large hail for several hours without interference. The slow-moving storm also produced flash flooding.



introduction
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.

schematic diagrams