tornadoes · 2018-12-13 · 13 13 warning systems tornado watch: tornadoes are possible in your...
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Tornadoes
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Tornadoes
• Watch Tornadoes 101: https://www.youtube.com/watch?v=iMWoYPaQx0Q
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What are they?
• A tornado is a violent rotating funnel of air that extends from a thunderstorm to the ground.
• They form when a rotating air is lifted upward into a storm, creating a spinning column with very high winds.
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Where do they form?
“Tornado Alley” in the central US has the most tornadoes, though the Midwest and the South see many as well.
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Where do they form?
They occur on every continent except Antarctica, though 75% occur in the United States.
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Tornadoes: Shapes and Sizes
Weak Tornadoes EF0 and EF1
• 69% of all tornadoes
• Less than 5% of tornado deaths
• Lifetime 1-10+ minutes
• Winds less than 110 mph
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Strong Tornadoes EF 2 and EF 3 • 29% of all tornadoes
• Nearly 30% of all tornado deaths
• May last 20 minutes or longer
• Winds 110-165 mph
Tornadoes: Shapes and Sizes
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Violent Tornadoes EF 4 and EF 5 • Only 2% of all tornadoes
• 70% of all tornado deaths
• Lifetime can exceed 1 hour
• Winds greater than 165 mph
Tornadoes: Shapes and Sizes
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EF Scale Watch: https://www.youtube.com/watch?v=C7Wrj7mTJ6M
Tornadoes: Shapes and Sizes
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Effects of Tornadoes
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Effects of Tornadoes
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Warning Systems
TORNADO WATCH: Tornadoes are possible in your area. Remain alert for approaching storms. TORNADO WARNING: A tornado has been sighted or indicated by weather radar. If a tornado warning is issued for your area and the sky becomes threatening, move to your pre-designated place of safety.