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Tornadoes

Tornadoes. Chapter 3 Section 2B Pages 85-88. Tornadoes. A rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud and touches Earth’s surface Usually are on the ground for 15 min or less May be a few hundred meters across Wind speeds approach 480km/hr ( 300mph ) .

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Tornadoes

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  1. Tornadoes Chapter 3 Section 2B Pages 85-88

  2. Tornadoes A rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud andtouches Earth’s surface Usually are on the ground for 15 min or less May be a few hundred meters across Wind speeds approach 480km/hr(300mph).

  3. Waterspout If it occurs over a lake or ocean, it is called a Waterspout. • St. Thomas, US Virgin Islands

  4. How Tornadoes Form Develop in low, heavy cumulonimbus clouds (the same that form thunderstorms) calledSupercells, which have a deep, persistent updraft called a Mesocyclone

  5. Supercell

  6. How Tornadoes Form Tornado Alley located in the great plains Cold, dry air moves south from Canada Warm, humid air moves north from the Gulf Forms a Squall Line, a wall of thunderstorms

  7. Squall Line

  8. Fujita Scale

  9. Tornado Safety US averages 800 tornadoes a year Damage is due to strong winds and flying debris (objects picked up by the tornado) The low pressure sucks up dust and other objects into the funnel Tornadoes can move large objects: • Sheds • Trailers • Cars • Homes.

  10. PA Tornado History May 31, 1985 Same date as the Johnstown Flood, which killed 2,200 people Deadliest tornado in state history Storm Report Tornadoes by County Recorded 30 tornadoes

  11. Tornado Safety • Tornado Watch means monitor possible tornadoes in your area • Tornado Warning means a tornado has been spotted on the ground • Do NOTwait until you see the tornado to seek shelter!

  12. Tornado Safety • The safest place to be is in the basement of a well built building • If no basement, move to the middle of the ground floor (typically a bathroom) • Stay away from windows and doors • Lie on the floor under a sturdy type of furniture (a large table).

  13. Exit Pass What is the difference between a Cumulonimbus cloud and a Supercell?

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