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One way a tornado forms is when warm moist air meets dry cool air head on!

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This video was uploaded from an Android phone.

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The diameter is usually between 100 and 600 meters.

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Some tornadoes are more than 1 mile wide.

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Some stand nearly still while others move faster than 62 mph.

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Its winds can move up to 217 mph.

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The Fujita Scale measures the strength of tornadoes.

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Tornadoes often form in " Tornado Alley" of the central plains between the Rocky Mountains and the Mississippi River.

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A hurricane forms over warm waters including the Pacific Ocean, Atlantic Ocean,and Indian Ocean

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A hurricane forms when warm moist air rises over tropical waters and wind speeds reach beyond 73 mph.

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They are usually 342 miles in diameter.

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A hurricane can move at speeds 5 to 15 mph.

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The wind speed can range from 74 to 155 mph or more.

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The damage is measured by the Saffir/Simpson Scale.