WW2010
University of Illinois

WW2010
 
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  educational cd-rom
 
  current weather
 
> about ww2010
 
  index

About WW2010
 
  welcome
 
  history
 
  publications
 
> user's guide
 
  updates
 
  acknowledgments
 
  terms for data use
 
  clients & cookies

User's Guide
 
  project summary
 
  content resources
 
> core technologies

Core Technologies
 
  overview
 
> efficient navigation
 
  multiple interfaces

Efficient Navigation
 
  introduction
 
> example: cold fronts

Example: Cold Fronts
 
> definition
 
  precipitation
 
  cyclones

User Interface
 
  graphics
> text

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This opens up an additional menu of cold front related topics. So the current page is now "definition" within "Example: Cold Fronts". The items available in the "Example: Cold Fronts" menu include a definition (current page), details about cold fronts and precipitation, plus the importance of cold fronts in cyclones.


Cold Front
transition from warm air to cold air

A cold front is defined as the transition zone where a cold air mass is replacing a warmer air mass. The air behind a cold front is colder and generally drier than the air ahead of it. In the picture below, temperatures ahead of the cold front are 55 and 62 degrees while behind the front temperatures are lower, 31 and 28.

If you were standing outside and a cold front passed through, the air would become cooler and drier than it was before. Occasionally, the temperature can drop as much as 15 degrees in an hour after a cold front comes through.

Symbolically, a cold front is represented by a solid blue line with triangles along the front pointing towards warmer air. The triangles indicate the direction in which the front is moving. On most weather maps however, a cold front is represented by simply a solid blue line.



Efficient Navigation
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.

precipitation