WW2010
University of Illinois

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

Upper Air Maps
 
  300 hghts, temps
 
  300 hghts, winds
 
  500 hghts, temps
 
  500 hghts, winds
 
  700 hghts, temps
 
> 700 hghts, moisture
 
  850 hghts, temps
 
  850 hghts, moisture

User Interface
 
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> 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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700 mb Heights and Dew Point Depressions
upper air data

[Image: (50K)]
Latest image

This panel shows the latest 700 mb field for geopotential height, winds, and dew point depression. 700 mb charts depict conditions in the middle troposphere (roughly 3000 meters). This is also referred to as the steering level, since most weather systems are "steered" by the winds at this level.

Geopotential height approximates the actual height of a pressure surface above mean sea-level and is represented by the solid white contours. The geopotential height field is given in meters with an interval of 30 meters between height lines. The locations of surface cyclones and anticyclones hold similar positions in the 700 mb geopotential height field.

Wind vectors indicate wind direction and wind speed and are drawn here as tiny white arrows. Wind vectors point towards the direction in which the wind is blowing and the longer the wind vector, the stronger the wind. The unit of magnitude for wind speed as depicted by the wind vectors is meters per second.

Dew point depression is represented by the color filled regions and the associated values are indicated by the color code located in the lower left corner of the forecast panel. Dew point depression is defined as the difference between the dew point temperature and the actual temperature. Regions of moist air are identified by smaller dew point depression values, while greater values indicate drier air. The greater the dew point depression (more negative), the more moist the air, which is precursor for the development of clouds and precipitation.



700 hghts, temps
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.

850 hghts, temps