A tornado is a rotating column of air attached to a thunderstorm that comes in contact with the ground. The most violent of all atmospheric events is.

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Presentation transcript:

A tornado is a rotating column of air attached to a thunderstorm that comes in contact with the ground. The most violent of all atmospheric events is the tornado. On average, 800 to 1,000 tornadoes occur in the U.S. each year. Tornadoes occur in every state in the U.S. Tornado winds can reach 300 mph.

Tornadoes can be a mile or more wide. Tornadoes can travel at speeds from almost stationary to 70 mph. The life of a tornado can exceed one hour. Tornadoes most likely occur between 3 and 9 pm. Tornadoes may appear transparent until dust and debris are picked up. On average, tornadoes kill about 60 people a year.

chimney damage, tree branches broken F-0: mph mobile homes pushed off foundation or overturned F-1: mph considerable damage, mobile homes demolished, trees uprooted F-2: mph roofs and walls torn down, trains overturned, cars thrown F-3: mph well-constructed walls leveled F-4: mph homes lifted off foundation and carried considerable distances, autos thrown as far as 100 meters F-5: mph The strength of a tornado is determined by using the Fujita - Pearson Tornado Scale

1.Texas 2.Oklahoma* 3.Kansas 4.Florida 5.Nebraska 6.Iowa 7.Missouri 8.Illinois 9.Louisiana 10.Colorado *Oklahoma City has been hit by more tornadoes than any other city since 1890

On May 4, 1999 — Oklahoma experienced about 40 violent tornadoes. Tornadoes struck heavily populated areas. Was the sixth deadliest tornado outbreak in Oklahoma history. This image was captured by NOAA's GOES-8 (Geostationary Operational Environmental Satellite)

May 3, 1999 tornado outbreak

Tornadoes have caused over $30 billion in damage in the United States. Tornadoes have injured over 75,000 people in the United States. Tornadoes have killed over 4,500 people in the United States.

Meteorologists can predict severe storms and issue warnings that appear on your television or computer screens.

The red area represents the region that has the highest occurrence of tornadoes. This region is known as “Tornado Alley.”

This is the oldest known photo of a tornado. It was taken on August 28, 1884 near Howard, South Dakota. The name of the photographer is not known.

tornadoguide.html tornadoguide.html

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