WW2010
University of Illinois

WW2010
 
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Online Guides
 
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Reading Maps
 
  introduction
 
  utc conversions
 
  temp conversions
 
  surface obs
 
> surface maps
 
  upper air obs

Surface Maps
 
  temperature maps
 
  dew point maps
 
> pressure maps
 
  observation maps

Pressure Maps
 
  sea level pressure
 
  pressure & wind
 
> pres, ir sat
 
  pres, ir sat, wind

User Interface
 
  graphics
> text

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Pressure and Infrared Satellite

[Image: (46K)]
Reference Weather Map

Current Weather Map

This panel depicts sea-level pressure across the United States. This chart is useful for finding regions of high and low pressure systems.

The solid white contours represent pressure contours (isobars) in millibars. The isobars have an interval of 4 millibars. The wind speed is directly related to the distance between the isobars. The closer they are together, the stronger the pressure gradient, and the stronger the wind.

In the background, infrared satellite data shows the cloud patterns over North America. The brightness of the cloud images is inversely proportional to the temperature of cloud tops, therefore the deep clouds with high (and thus cold) cloud tops typically indicating areas of intense rain and/or hail associated with deep convection appear brightest on this image. However high cirrus clouds will often also appear very bright, but these clouds do not produce precipitation. Low and high pressure systems can also be located from the map above. Low pressure systems are located in the regions of the lowest pressure, while high pressure systems are located in the regions of highest pressure.

For more information on how pressure affects the weather go to our forces and winds module.



pressure & wind
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.

pres, ir sat, wind