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Recorded by Andy Bailey, National Weather Service, Pleasant Hill, Mo.
A TORNADO WATCH means that tornadoes are possible in your area. Remain alert for approaching storms. Find out what counties are in the watch area by listening to your NOAA Weather Radio or local radio and television stations.
A TORNADO WARNING means that a tornado has been sighted or indicated by weather radar. Take cover immediately.
Tornadoes occur most frequently in the United States east of the Rocky Mountains. A tornado is defined as a violently rotating column of air extending from a thunderstorm to the ground.
The most violent tornadoes are capable of tremendous destruction with wind speeds of 250 mph or more. Damage paths can be in excess of one mile wide and 50 miles long. In an average year, 800 tornadoes are reported nationwide.