Tornadoes Photo courtesy of NOAA/SPC. Tornado Facts A tornado is a rotating column of air attached to a thunderstorm that comes in contact with the ground.

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Presentation transcript:

Tornadoes Photo courtesy of NOAA/SPC

Tornado Facts 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 United States each year. Tornadoes occur in every state in the United States. Tornado winds reach 300 mph.

Tornado Facts 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 p.m. and 9 p.m. Tornadoes may appear transparent until dust and debris are picked up.

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

States Where Most Tornadoes Occur 1. T exas 2. O klahoma 3. A rkansas 4. A labama 5. M ississippi 6. I llinois 7. M issouri 8. I ndiana 9. L ouisiana 10. T ennessee

Tornado Damage Photo courtesy of NOAA/SPC

Since 1950: Tornadoes have caused over $25 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.