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TORNADOES

TORNADOES. Causes/ Scale / Linked to Global Warming??. Worst Tornado Ever. The infamous “Tri – state” Tornado of March 18 1925, swept through the northern part of Missouri and southern Indiana and Illinois.

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TORNADOES

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  1. TORNADOES Causes/ Scale / Linked to Global Warming??

  2. Worst Tornado Ever The infamous “Tri – state” Tornado of March 18 1925, swept through the northern part of Missouri and southern Indiana and Illinois. It moved along a 350km track at speeds of 100 – 120km/hr. This Tornado caused F5 damage and took 695 lives. Weather conditions in the are that day spawned 6 more tornadoes, which killed 51 more people and caused widespread damage.

  3. Tornadoes Sometimes people confuse tornadoes with tropical storms – both cause deadly weather spirals by rising warm air Beyond that – they are very different Tornado season spans spring and summer Tropical storms – summer / fall

  4. Tornadoes Develop over land – not water. Do not create storm surges They drop down from the clouds The spiral of a tornado is its trademark, much tighter and faster-spinning than a hurricane. Tornadoes can occur worldwide, but most happen in USA (1200 annually) and Canada (100)

  5. Tornado Alley

  6. Tornado Alley The map shows that tornadoes occur over the eastern part of North America, including Canada. 1980’s – “Twisters” tore into Barrie ON, Edmonton Alberta – taking a total of 38 lives. The states of Kansas and Oklahoma are the heartland of tornado country – called Tornado Alley.

  7. Fujita (EF) Scale

  8. FUJITA (EF) SCALE A tornado is one of the fastest moving natural phenomena s on earth. The severity of a twister is measured by the Fujita Scale. Originally it was called the F-Scale 2007 – the E was added – meaning ‘enhanced’

  9. What Causes a Tornado?

  10. Causes Tornadoes are likely to occur when warm, humid air and colder air are close to one another. This happens when the warm air from the Gulf of Mexico flows North and mixes with the cold arctic air from Canada.

  11. Vortex As humid air rises during the daytime, columns of colder air rush down to the ground to take it’s place. Sometimes, the rising air begins to rotate around a cold air column. This forms a funnel of spiraling warm air called a Vortex.

  12. Vortex

  13. Formation of a Tornado

  14. Global Warming?? Ocean seas are rising, which has led some people to conclude that global warming will probably cause more severe tornadoes. To date, scientific research has NOT proved the connection.

  15. Barrie Ontario - 1985

  16. Tornado Damage

  17. Follow up Questions • Make a Venn Diagram to compare and contrast a tornado to a tropical storm. • Ontario is sometimes struck by tornadoes. Prepare a community Tornado Emergency Plan. • (a) prepare people in advance • (b) design a way to alert people

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