Tornadoes.

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Tornadoes are very violent and kill many people each year.

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Presentation transcript:

Tornadoes

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)

Funnel Cloud v. Tornado Tornado Funnel Cloud

Waterspout - over water - less power - smaller temp gradient

World Tornado Geography USA: 90%+ of all tornadoes

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

USA Tornado Season Most common when temperature gradient in central U.S. is greatest.

USA Tornado Occurrence About 800-1000 tornadoes spotted each year.

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

Largest Tornado Outbreak 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

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

Tornado Indicators What to look for….