According to NOAA, in an average year, 800 tornadoes are reported in the U.S., resulting in 80 deaths and over 1,500 injuries. 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. Tornadoes have occurred in every month and at all times of the day or night. Anyone who has witnessed a tornado firsthand knows about the awesome power of these deadly storms. Although quite different in size, shape, and duration, these swirling windstorms can rip building from their foundations, tear the roofs off houses, uproot trees, or toss cars through the air.

Tornadoes occasionally develop in areas in which a severe thunderstorm watch or warning is in effect. Remain alert to signs of an approaching tornado and seek shelter if threatening conditions exist. There is often little or no warning. Be sure everyone in your family, including children know what to do. Tornadoes often occur in conjunction with severe thunderstorms that produce hail. If you believe a tornado is approaching, do not wait for a warning to be issued. Take cover.

TORNADO WATCH: Tornadoes are possible in your area. Remain alert for approaching storms.

TORNADO WARNING: A tornado has been sighted or indicated by weather radar. If a tornado warning is issued for your area and the sky becomes threatening, move to your pre-designated place of safety.

Dark, often greenish sky
Wall cloud
Large hail
Loud roar; similar to a freight train

MYTH: Areas near rivers, lakes, and mountains are safe from tornadoes.
FACT: No place is safe from tornadoes. In the late 1980's, a tornado swept through Yellowstone National Park leaving a path of destruction up and down a 10,000 ft. mountain.

MYTH: The low pressure with a tornado causes buildings to "explode" as the tornado passes overhead.
FACT: Violent winds and debris slamming into buildings cause most structural damage.

MYTH: Windows should be opened before a tornado approaches to equalize pressure and minimize damage.
FACT: Opening windows allows damaging winds to enter the structure. Leave the windows alone; instead, immediately go to a safe place.

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Page last updated: Friday, October 24, 2008