Doppler radar uses microwaves that are sent from the radar outward where they interact with water particles and the information is sent back to the radar where the data is computed to where an image is produced which shows the frequency, or denseness of the water and tracks it to show how fast it is moving and in what direction as well as the temperature of the water. With doppler radar it is possible to differentiate between snow, sleet, and rain as well as tracking its motion. The most important information which comes from dopplar radar is the tracking of storm cells in order to see if a tornado is forming, and where, or to track the strength of a hurricane from a distance..
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