WW2010
University of Illinois

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

Online Guides
 
  introduction
 
  meteorology
 
  remote sensing
 
> reading maps
 
  projects, activities

Reading Maps
 
  introduction
 
  utc conversions
 
  temp conversions
 
  surface obs
 
> surface maps
 
  upper air obs

Surafce Maps
 
  obs, isobars, radar
 
  obs, isobars, ir sat
 
  temp contours
 
  temperatures, winds
 
  dew point reports
 
  dew points, winds
 
> 24 hour totals
 
  analysis pairs

24 Hour Totals
 
  maximum temps
 
> minimum temps
 
  24 hour precip
 
  snow cover

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.
.
Minimum Temperatures

[Image: (28K)]
24-hour Minimum Surface Temperatures

This meteorological surface chart shows the minimum temperatures during a 24 hour period prior to 0600Z of the date shown in the upper right hand corner. The minimum temperatures are displayed in degrees Fahrenheit at chosen surface stations.

This map should roughly resemble the current temperature map, but significant differences will arise from quick moving storm systems, as well as from variable amount of local radiational cooling brought on by weak winds during the night. Dry, clear conditions, characteristic of a continental airmass, allow large amounts of infrared energy to be radiated by the earth's surface out to space, decreasing the surface air temperature. Cloudy conditions as well as very moist air, prevent the infrared radiation from being emitted to space. Radiative cooling is most effective during the winter, when there is snow cover on the ground, and in absence of warm air advection. Warm advection can offset the effects of radiational cooling, especially in case of strong warm fronts. Large diurnal variations (daily differences between daytime high and nighttime low temperatures) occur on clear, dry days. Generally minimum temperature for the day occurs in the early morning hours, just before sunrise. However, low temperatures can occur at unusual times of the day or night, due to cold and warm surface fronts passing through the region.



maximum 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.

24 hour precip