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How to track tornadoes 
Watch doppler radar for severe storm cells. 
Doppler radar detects the speed and movement of a storm by using radio wave pulses and it is highly accurate. There are different colors to signify the intensity of a storm.
Greens indicate light rain, yellows and oranges are moderate to heavy rains, and red means very heavy rain or hail. Use a weather app on your phone, visit weather websites like weather.com and weather underground, or watch your local news for up to date doppler forecasts.