Important Terms

A severe thunderstorm watch is issued by the National Weather Service when the weather conditions are such that a severe thunderstorm is likely to develop. (A severe thunderstorm has winds at least 58 miles per hour or hail at least three-fourths of an inch in diameter.) When you hear a thunderstorm watch, go to a safe place right away and listen to the radio or television for more information.

A severe thunderstorm warning is issued when a severe thunderstorm has been sighted or indicated by weather radar. A warning is more severe than a watch. If you are not already in a safe place, get there at once! Listen to a battery-operated radio or television and wait for the "all clear."

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