WW2010
University of Illinois

WW2010
 
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Meteorology
 
  introduction
 
> air masses, fronts
 
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  el nino
 
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Air Masses, Fronts
 
  introduction
 
  air masses
 
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> advection

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

User Interface
 
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> text

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850 mb Temperature Advection
an indicator of surface changes to come

Warm advection at 850 mb is often indicative of rising temperatures at the surface, while cold advection at this level often precedes falling temperatures. Regions of strongest temperature advection are found where geopotential height contours (blue) and isotherms (red) are nearly perpendicular to each other. For example, on the following 850 mb surface, the strongest cold advection is occurring from Montana to New Mexico, while the strongest warm advection is occurring from eastern Texas into Illinois.

[Image: 850 mb heights and temps (43K)]

The influence of thermal advection at 850mb is typically felt at the surface about a day later (map below). In the area under cold advection, temperatures ranged from the 20's to 40's, with winds generally out of the northwest bringing colder air southward from Canada.

[Image: surface temps (25K)]

Regions in the area of warm advection, however, were experiencing temperatures in the 60's, providing these areas with a Spring day in early January.



warm 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.

moisture advection