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Tornadoes

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Tornado Classification. Fujita F-scale. F0 (winds 120 mph) to F5 (winds 200-300 mph) ... cloud is an indicator. Orlando, Florida. Tornado Indicators. What to ... – PowerPoint PPT presentation

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Title: Tornadoes


1
Tornadoes
2
Tornado Formation
  • Severe Super Cell Thunderstorm (1 spawn
    tornadoes)
  • Often occur along cold fronts and move to NE
  • Strong updrafts
  • Wind shear (change in direction or strength of
    winds from top to bottom of storm)

3
Funnel Cloud v. Tornado
Tornado
Funnel Cloud
4
Waterspout- over water - less power- smaller
tempgradient
5
World Tornado Geography
  • USA 90 of all tornadoes

6
USA Tornado Geography
  • Every state!
  • Tornado Alley (TX, OK, KS, NE)

7
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8
USA Tornado Season
Most common when temperature gradient in central
U.S. is greatest.
9
USA Tornado Occurrence
  • About 800-1000 tornadoes spotted each year.

10
Tornado Classification
  • Fujita F-scale
  • F0 (winds lt 120 mph) to F5 (winds 200-300 mph)
  • based on rotational wind speed and damage done
  • Size Tornadoes generally lt 1/4 mile wide (damage
    path only 150 ft.)

11
Deadliest Tornado
  • Tri-state tornado outbreak of March 18, 1925
  • Kills 689 people in Missouri, Illinois Indiana

Largest Tornado Outbreak
  • April 3-4, 1974 Super-Outbreak
  • 148 tornadoes overnight across 11 states

12
Tornado Forecasting
  • NEXRAD doppler radar (WSR-88D)
  • 138 stations across the USA
  • Intensity of storm noted by amount of reflection
    off rain, hail, and ice crystals.
  • Hook cloud is an indicator.

Orlando, Florida
13
Tornado Indicators
  • What to look for.
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