Transcript Extreme Weather

Extreme Weather
By Kim Brasseur
Types of Extreme Weather
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Tornadoes
Hurricanes
Thunder and Lightening
Blizzards
Floods
Tornadoes
• Tornadoes are the most powerful,
unpredictable and destructive weather system
on earth.
• A tornado is a violent rotating funnel-shaped
column of air extending from a thunderstorm
to the ground.
• They can have wind speed up to 300 mph.
• Tornadoes happen where dry, cold air masses
mix with warm, moist air masses.
• More tornadoes occur in the United States
Hurricanes
• A huge storm that measures several hundred miles in diameter
• Hurricanes have two main parts
• First is the “eye” of the hurricane, which is a calm area in the center
of the storm.
• second is the wall of the clouds that surrounds the calm eye. This is
where the hurricane’s strongest winds and heaviest rain occur.
• Hurricanes rotate in a counter-clockwise direction around the eye.
• Hurricane winds can be 74 to 200 mph.
• Hurricanes are born over warm, tropical oceans.
• They are fueled by water vapor that is pushed up from the warm
ocean surface.
• http://www.youtube.com/watch?v=OEPZOC6YHUc
Thunder
• A thunderstorm is a storm with lightning and thunder.
• Thunder is caused by lightning.
• They are produced by a cumulonimbus cloud, usually
producing gusty winds and heavy rain, and sometimes
hail.
• Thunderstorms are caused by rapidly rising and falling
currents of air.
• When a lightning bolt travels from the cloud to the
ground it opens up a little hole in the air called a
channel.
• Once then light is gone the air collapses back in and
creates a sound wave that we hear as thunder.
Lightning
• Lightning is a sudden, violent flash of electricity
between a cloud and the ground, or from cloud
to cloud.
• A lightning flash, or bolt can be several miles
long.
• Lightning is so hot, with a average temperature of
34,00 degrees Centigrade, that the air around it
suddenly expands with a loud blast. This is the
thunder we hear.
• Lightning occurs in hot, wet storms.
Blizzards
• A blizzards is a long-lasting snowstorm with strong
winds, intense snowfall, and cold temperatures.
• Winds of 35mph or greater, and little visibility.
• Three things are needed to have a blizzard; cold air at
the surface, lots of moisture, and lift.
• When a mass of polar air and warm air meet, the polar
air pushes the warm air up and settles in the
atmosphere where the water vapor forms snow clouds.
• The winds and low temperatures combine with the
snow to create a blizzard.
Flash Flood
• A flash flood is the fastest moving type of
flood.
• They happen when heavy rain collects in a
stream or gully, turning the normally calm
area into an instant rushing current.
• Flash floods appear and move quickly across
the land, with little warning that it’s coming.
• Flash floods are generally a result of heavy
rainfall concentrated over one area.
• Most flash flooding is caused by slow-moving
Sources
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Information
http://www.livescience.com/environment/lightning_science.html
http://weatherwizkids.com/index.htm
http://fema.gov/kids
http://wwwworldstory.net/en/tunder.html
http://weathereye.kgan.com/expert/blizzard/wnstroms.html
http://www.theteachersguide.com/weather.html
http://www.livescience.com/hurricanes/
http://www.extremescience.com/weatherport.htm
http://library.thinkquest.org/3805/events/Bliz.htm
Sources
• Pictures
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http://www.howtosurviveit.com/tornado-natural-disaster-400a061807.jpg
www.pntmc.org.nz/
photos/Wanganui/
pages/
Flood_2.html
ed101.bu.edu/.../mattwall/Extreme%20Weather.htm
www.flickr.com/
photos/blackwolve/
1471494190/
https://www.novelmaker.com/index/genre_select...
www.ehow.com/how_4027_prepare-home-hurricane.html
www.sun-tek.com/ExtWthr.htm
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www.topnews.in/regions/greece
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