Basic interpretation - the radiant energy measured by infrared radiometers is converted to a temperature. Cold objects (like very thick clouds) are white and warmer objects (like the surface or very thin clouds) appear darker or grayish.
This example of an infrared (IR) image is very typical of the images you may see on a televised medium or weather web-cast. Time sequences of infrared images are collected and can be streamed together to demonstrate a type of animated motion of clouds developing and dissipating.
Note: Weather maps do not have the “state names” labeled on the maps, and students should review regional geography before practicing their weather map interpretation skills.
For more information: http://www.ehow.com/video_4435910_read-radar-satellite-weather-images.html