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

Clouds, Precipitation
 
  introduction
 
  development
 
  cloud types
 
> precipitation

Precipitation
 
  introduction
 
  rain and hail
 
> freezing rain
 
  sleet
 
  snow

Freezing Rain
 
  definition
 
  dangers
 
  regions
 
> processes
 
  conditions
 
  forecasting

processes
 
  ice-crystal
 
> warm-rain

User Interface
 
  graphics
> text

NOTE: We've guessed that you're not using a client that supports colored tables and have tried to compensate. Low graphics mode looks much better on clients that do... we recommend switching to Netscape 3.0 or Microsoft Internet Explorer.
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Supercooled Warm-Rain Processes
the formation of freezing rain

A less common way that freezing rain forms is through supercooled warm-rain process (SWRP), where cloud top temperatures are warmer than about -10C. Supercooled raindrops develop as microscopic cloud droplets collect one another as they fall. Ice processes are not involved in the formation of these raindrops.

[Image: All supercool raindrops (22K)]

The precipitation falls to the surface as supercooled rain or drizzle and freezes instantly on contact. The raindrops do not freeze within the cold layer because there are very few ice nuclei in the presence of warmer temperatures.

[Image: Freezing rain on a tree (30K)]
Photograph by: Olthoff
The freezing rain forms a coat of ice on everything. This picture shows several tree branches coated with a thick layer of ice that accumulated during a central Illinois ice storm.



ice-crystal
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.

Conditions