WW2010
University of Illinois

WW2010
 
  welcome
 
> online guides
 
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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

Multicell Clusters
 
> introduction
 
  components
 
  development
 
  perspectives
 
  life cycle
 
  evolving storm

User Interface
 
  graphics
> text

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Multicell Cluster Storms
a cluster of storms in varying stages of development

A multicell cluster consists of a group of cells moving as a single unit, with each cell in a different stage of the thunderstorm life cycle. As the multicell cluster evolves, individual cells take turns at being the most dominant. New cells tend to form along the upwind (typically western or southwestern) edge of the cluster, with mature cells located at the center and dissipating cells found along the downwind (east or northeast) portion of the cluster.

Multicell cluster storms frequently look similar to the one pictured in the photograph below, (assuming that low visibilities and/or intervening clouds, trees, or hills do not obscure the view). Looking north from about 10 miles, note the three distinct updraft towers at the left (west) portion of the storm. The heaviest precipitation likely falls beneath the highest cloud top. The right (east) side of the complex is dominated by anvil outflow, moving with the storm from left to right.

[Image: mulicell cluster over an open field (51K)]
Photograph by: Moller

Multicell severe weather can be of any variety, and generally these storms are more potent than single cell storms, but considerably less so than supercells. Organized multicell storms have the higher severe weather potential, although unorganized multicells, which are simply conglomerates of single cells, can produce pulse storm-like bursts of severe events.

Actually, the distinction between multicell and single cell storms is not nearly as important as that between multicells and supercells. The multicell flash flood threat can be significant, in fact most flash floods probably occur with multicell complexes. As with all thunderstorms, the threat to the aviation community is quite high.



Single Cell Storms
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.

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