WW2010
University of Illinois

WW2010
 
  welcome
 
  online guides
 
> archives
 
  educational cd-rom
 
  current weather
 
  about ww2010
 
  index

Archives
 
> case studies

Case Studies
 
  introduction
 
> veterans day snow
 
  hurricane andrew
 
  4/19 il tornadoes
 
  superstorm '93

Veterans Day Snow
 
  introduction
 
  personal perspective
 
> data and analysis
 
  advanced topics

Data and Analysis
 
  introduction
 
  snowfall totals
 
  radar imagery
 
  upper air data
 
> surface analysis
 
  lake erie temps
 
  weather statements

Surface Analysis
 
  introduction
 
  nov 10, 1996 04z
 
  nov 10, 1996 10z
 
  nov 11, 1996 13z
 
  nov 11, 1996 19z
 
> nov 12, 1996 03z
 
  nov 12, 1996 19z
 
  nov 13, 1996 03z

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.
.
November 12, 1996, 03Z
surface data analysis

On the morning of November 12, 1996, snow showers and squalls are limited to the snowbelts of the eastern lakes with diminishing snows in the western lakes.

Temperatures are not quite as cold as the previous morning away from the lakes, but are colder near the lakes as the cold air mass becomes further entrenched in the region. The remains of the original polar front can still be detected along the spine of the Appalachians - note, the surface cold air never does make it to the east coast during this storm.

The flow near the surface remains moderately strong during this time. Similar to other analyses, the flow changes direction quickly near the downwind shores of each lake. This is a result of the change in the surface roughness moving from the water to the land. The water is generally much smoother than the land surfaces - which means there is less frictional drag exerted upon the air flow. The net result of these forces deflects the wind to the left as the frictional drag increases.

This can be seen very well near the south shore of Lake Erie. Winds over the land are mostly WSW while winds across the open waters are roughly westerly. Also notice that within the transition area from land to water there is convergence of air flow in the case of westerly flow - yet another mechanism for focusing convection and rising motions near the lakeshore. In the case of Lake Michigan the winds clearly back or turn to the left once they exit the open waters and flow over Lower Michigan.



Nov 11, 1996 19z
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.

Nov 12, 1996 19z