TORNADOES

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TORNADOES
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How a Tornado is formed

• Opposing air masses meet
• A Super Cell formed
• Warm moist air is sucked upwards and twisted
• Rotating air column gathers force
• Downdrafts hit warm air below, revolving cloud
  formed below

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(No Transcript)
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• VIDEO CLIP

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Fujita Scale

• Rate the Severity of tornadoes as a measure of
  the damage they cause
• Scale from F0 F5
• F0 Light (winds 64 116 km/h) some damage to
  chimneys, TV antennas, roof shingles

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• F1 Moderate (winds 117 180 km/h) cars
  overturned, trees uprooted
• F2 Considerable (winds 181 252 km/h) roofs
  blown off homes, outdoor sheds demolished, mobile
  homes overturned
• F3 Severe (winds 253 330 km/h) exterior walls
  and roofs blown off homes, metal building
  collapsed forest and farmland flattened

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Fujita Scale Continued

• F4 Devastating (winds 331-417 km/h) few walls
  left standing in well built homes, large steel
  and concrete objects thrown great distance
• F5 Incredible (winds 418-509 km/h) strong frame
  houses lifted off foundation, cars fly through
  air in excess of 100 metres

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TORNADOES IN CANADA
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FAQ

• Where do tornadoes occur in Canada?
• Has Canada every had a F5 tornado?
• What are Canadas most deadly tornadoes?
• When is tornado season?

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Case Study Edmonton Tornado, 1987

• Video Clip