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

Surface Obs
 
  overview
 
  temperature
 
  weather
 
  dew points
 
  cloud cover
 
  pressure
 
  winds
 
> contours

Contours
 
  introduction
 
  isobars
 
  wind & isobars
 
> isotherms
 
  isodrosotherms
 
  more contouring

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.
.
Isotherms
surface maps

A line connecting points of equal temperature is called an isotherm. That means, at every point along a given isotherm, the values of temperature are the same.

Isotherms are represented by dashed orange contours in the Weather Visualizer. An image of surface temperature reports and isotherms has been given below.

The black numbers are station reports of surface temperature in degrees Fahrenheit, which is the unit for temperature in the U.S.. Most other nations of the world use Celsius.

The isotherms displayed were generated from the observed values of temperature, and have been plotted at intervals of 5 degrees Fahrenheit. The small orange numbers are contour labels, which identify the value of an isotherm (75, 85 degrees Fahrenheit).

For example, reported temperature values in Nebraska, southern Iowa and Illinois are generally 90 or above, and are therefore located south of the 90 degree contour.

In the image below, this surface temperature information has been incorporated into a more complex surface map generated for the same time.

Reported temperatures show that a dome of very warm air has pushed its way into Nebraska, where temperatures are above 90. More pleasant weather is found across North Dakota and Minnesota, where temperatures are in the 70's.



wind & isobars
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.

isodrosotherms