WW2010
University of Illinois

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

Forecast Maps
 
  300 hghts, winds
 
  300 hghts, temps
 
  500 hghts, vorticity
 
  500 hghts, temps
 
  700 hghts, humidity
 
  700 vvel, precip
 
  850 hghts, humidity
 
  850 hghts, temps
 
> 1000 convrg & temp
 
  sfc precip, prs, thk

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.
.
1000 mb Convergence and Temperature
model mode

[Image: (42K)]

This panel shows 1000 mb forecasted fields for convergence, temperature and wind vectors. The solid white contours represent temperature in degrees Celsius with an interval of 5 degrees. The temperature field is useful for locating warm and cold air masses and associated surface fronts.

Wind vectors provide information about 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.

Convergence 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. Regions of convergence are shown in red and regions of divergence are shown in blue.

In this particular image, the important feature is the line of convergence extending from Wisconsin through Illinois to Arkansas and Texas. This line on convergence is associated with a cold front. Clouds and precipitation would be expected to occur along this cold front.

Convergence means that more air is flowing into that region than flowing out. Since the air has to go somewhere, it rises and rising air is what induces precipitation development. Heavier precipitation is often associated with regions of stronger (>2) convergence. The opposite is true for areas of divergence, where more air is flowing out of the region than flowing in. To replace the net loss of air, air sinks from above and sinking air suppresses the development of clouds and precipitation.



850 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.

sfc precip, prs, thk