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

Dangers of T-storms
 
  lightning
 
> flash floods, hail
 
  outflow
 
  downbursts
 
  tornadoes

User Interface
 
  graphics
> text

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Flash Floods and Hail
property and personal devastation

Cases involving either slow-moving thunderstorms or a series of storms which move repeatedly across the same area (sometimes called train-echo storms) frequently result in flash flooding. The total number of flash flood deaths has exceeded tornado fatalities during the last several decades.

[Image: flash flooding (55K)]
Photograph by: NWS

Two factors seem to be responsible for this: public apathy regarding the flash flood threat and increased urbanization. When concrete replaces soil, rain water will run off rather than soak in. Flash flood producing rainfall has made this type of dramatic rescue attempt (pictured above) all too familiar, especially in urban areas and popular mountain camping spots.

Another danger associated with thunderstorms, especially to personal property, is hail. This hailfall occurred in Altus, Oklahoma in 1982 and was accompanied by several tornadoes. Hail causes more monetary loss than any other type of thunderstorm-spawned severe weather.

[Image: hail fall (58K)]
Photograph by: NSSL

Annually, the United States alone suffers about one billion dollars in crop damage from hail. Hail rarely kills people, but these were hollow words in China in May, 1986 when 100 people were killed, 9,000 injured, and 35,000 homes destroyed by an intense hailstorm.



lightning
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.

outflow