WW2010
University of Illinois

WW2010
 
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Online Guides
 
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> meteorology
 
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Meteorology
 
  introduction
 
> air masses, fronts
 
  clouds, precipitation
 
  el nino
 
  forces, winds
 
  hurricanes
 
  hydrologic cycle
 
  light, optics
 
  midlatitude cyclones
 
  severe storms
 
  weather forecasting

Air Masses, Fronts
 
  introduction
 
  air masses
 
  fronts
 
> advection

Advection
 
  advection
 
  cold advection
 
  warm advection
 
  850 temp advection
 
  moisture advection
 
> voriticity advection

User Interface
 
  graphics
> text

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Vorticity Advection
leads to rising/falling pressures at the surface

Vorticity is the localized rotation of the air. Air that rotates counterclockwise, such as in cyclones and troughs, is said to have positive vorticity. Clockwise rotating air, such as in high pressure systems and ridges, has negative vorticity. The advection of vorticity at high levels will result in a response at the surface which will attempt to offset the effects of the advection. More specifically, vorticity advection is indicative of rising motion/falling pressures at the surface. For example, look at this 500 mb map for 12Z, October 29, 1995.

[Image: 500 mb heights and vorticity (112K)]

Now look at these two maps of surface pressure (solid lines) from 12Z October 29,1995 and 0Z October 30,1995.

[Image: surface pressure and temperature (54K)]

Notice how the surface low has deepened in the area of strong vorticity advection.

[Image: surface pressure and temperature (56K)]



moisture advection
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.

Clouds, Precipitation