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Sierra Nielsen

on 27 April 2014

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Transcript of Thunderstorms

All thunderstorms produce lightning, which means they are dangerous. The thunder might not hurt you, but the lightning will. Thunder is the sound caused by lightning. Lightning is a electric current or a bright flash of electricity produced by a thunderstorm. Lightning kills and injures about 75 to 100 people each year, that's more than hurricanes or tornadoes. Most people struck by lightning do survive, but they often have a variety of symptoms.
A thunderstorm is a storm accompanied by lightning and thunder. According to National Weather Service, a severe thunderstorm contains hail that is three quarter of an inch and wind gusts are at 58 miles per hour or higher. Thunderstorms are caused by moisture, unstable air, and lift. The moisture forms clouds and rain. They need unstabled air that is relatively warm and can rise rapidly. The lift forms fronts, sea breezes, or mountains. Thunderstorms can be created year-round but they are most likely to occur during spring and summer months.

The typical thunderstorm is 15 miles in diameter and lasts an average of 30 minutes. About ten percent of thunderstorms are counted as severe by the National Weather Service. Thunder is difficult to hear at the distance of 12 miles away. Severe thunderstorms can bring heavy rains, which can cause lightning, hail, flash floods, and tornadoes. Lightnining is almost five times hotter than the sun's surface. On a yearly basis, thunderstorms cause about a billion dollars of damage. The least amount of average thunderstorm days a year comes from the state of Washington. The greatest amount of days is from Florida. You can tell how far away the storm is by counting the seconds between the lightning and
thunder. Then
divide by five.
By: Sierra Nielsen
This lightning is about
to strike.
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