WW2010
University of Illinois

WW2010
 
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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

Features
 
> overshooting tops
 
  rotating updrafts
 
  backlighting

User Interface
 
  graphics
> text

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Overshooting Tops
indicative of powerful updrafts

Looking east from about 40 miles away, we see a line of towering cumulus clouds and a large supercell storm in the background. Note the great amount of anvil overhang and the large overshooting dome at the summit of the updraft.

[Image: supercell with a domed, diffluent appearance (62K)]
Photograph by: Doswell

Distant supercells frequently have this domed, "diffluent" anvil appearance, with the supercell's tremendous updraft velocities and outflow resulting in marked upper-level divergence. The visual clues are strong, although we cannot be sure that this is a supercell simply from appearance. By necessity, man and machine (i.e., spotters and radar) complement each other in the severe weather detection program. This storm produced hail but no known tornadoes in eastern Oklahoma.

[Image: supercell with overshooting top (61K)]
Photograph by: Bluestein

This supercell featured a rock-hard, overshooting Cb top and anvil overhang, looking southeast from about 40 miles away. Note that the supercell Cb is more vertically oriented than the weaker updraft of the neighboring towering cumulus cloud. This is a valuable clue in estimating the strength of updrafts on a day with strong vertical wind shear. This storm produced baseball hail, but no known tornadoes, along a track in southeast Oklahoma and southwest Arkansas.



Supercells
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.

rotating updrafts