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Storms: Why do they form?

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by

Amanda Hillery-Mills

on 20 October 2014

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Transcript of Storms: Why do they form?

Blizzards
Deep within the clouds, ice crystals form and begin to fall towards Earth.
As they fall, wind gusts push the crystals back into the clouds.
They begin falling down again and grow significantly in size
This keeps happening until they are too heavy to be carried by the wind.
Hail Storm
Tornadoes
Hurricanes
What is a storm?
What is considered a "storm"?
Miss Hillery-Mills
Storms: Why do they form?
A violent disturbance in the atmosphere with strong winds and usually rain, thunder, lightening or snow.
Hurricane
Tornado
Hail Storm
Blizzard/Heavy Snow
Thunderstorm
A hurricane is a storm with violent wind and intense rain usually formed in tropical areas such as the Carribbean.
Hurricanes gather heat and energy from warm ocean water.
They include winds between 75 and 200 mph.
They can be up to 600 miles across.
What does it need?
Tornadoes
A tornado is a rapidly spinning tube that touches the ground and the cloud above
A tornado needs warm air from the Gulf of Mexico and cold air from Canada.
When the air masses meet, it causes instability in the atmosphere
A blizzard IS NOT just snow.
For a snow storm to be considered a blizzard, it must have strong winds and enough snow to majorly limit visibility.
How do they form?
Very similarly to hurricanes and tornadoes
A cold front collides with a warm front causing a low pressure zone
If there are ice filled clouds in this zone, there is potential for a blizzard
The further down the low pressure gets, the more powerful the winds get.
Thunderstorms
Thunderstorms
Thunderstorms are storms with thunder and lightening, heavy rain, wind gusts and sometimes hail
Ingredients: moisture, rising air and something to give it a "nudge"
Warm air rises and begins to cool as it rises forming a cloud which rises into freezing temperatures
The water droplets increase in size.
Lightning
Lightning is actually electricity.
Small bits of ice bump into each other as they move around in the air.
This movement forms an electric charge.
A positive charge forms at the top of the cloud and negative at the bottom.
A positive charge forms in the ground.
The charges meet and -zap- lightning.
Thunder
Thunder is the noise that accompanies lightning.
When electricity causes lightning to happen, the lightning causes vibrations.
The vibrations are sounds that we know as thunder.
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