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Tamara Howden

on 20 May 2015

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Transcript of Thunderstorms

How many thunderstorms are there every day?
It is estimated that there are around 1,800 thunderstorms that occur across our planet every day on average.
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What is a thunderstorm?
A thunderstorm is a storm. It’s produced by a cumulonimbus cloud, Cumulonimbus clouds are thunderstorm clouds. Cumulonimbus clouds produce gusty winds, heavy rain, snow, hail, lightning and even tornadoes.
What causes a thunderstorm?
Thunderstorms are made from moisture, unstable air and lift. You need moisture to form clouds and rain. You need unstable air that is relatively warm and can rise rapidly. Finally, you need lift.
What causes thunder?
Thunder is caused by lightning. When a lightning bolt travels from the cloud to the ground it opens up a channel in the air for a second, then air collapses back in and creates a sound wave that we hear as thunder.
Fun Facts
The typical thunderstorm is 15 miles in diameter and lasts an average of 30 minutes.
Thunderstorms happen in every state and every thunderstorm has lightning.
Lightning kills and injures more people each year than hurricanes or tornadoes; about 75 to 100 people.

When are thunderstorms most likely to occur?
Thunderstorms can occur at any time. But they are most likely to happen in the spring and summer months in the afternoon or evening .
If You're Outdoors:
Don’t wait for the rain to begin. If you hear the sound of thunder, go to a safe place immediately. Avoid sheds and picnic areas. If there is no shelter around you, stay away from trees. Get down on your hands and knees and keep your head tucked in and put your hands over your ears to minimize hearing damage from thunder.
If You're Indoors:
Avoid water. So do not take a shower, wash your hands, wash dishes or do laundry. Do not use a corded telephone. Lightning may strike exterior phone lines. Do not use electric equipment like computers and appliances during a storm. Stay away from windows and doors.
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