Extreme Weather

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Extreme Weather

• By Kim Brasseur

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Types of Extreme Weather

• Tornadoes
• Hurricanes
• Thunder and Lightening
• Blizzards
• Floods

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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 than in
  any other country.

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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 hurricanes
  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?vOEPZOC6YHUc

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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.

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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.

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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.

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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 its coming.
• Flash floods are generally a result of heavy
  rainfall concentrated over one area.
• Most flash flooding is caused by slow-moving
  thunderstorms, thunderstorms that repeatedly move
  over the same area, or heavy rains from
  hurricanes and tropical storms.
• Dam failure can also cause a bad flash flood.
  When a dam breaks a gigantic amount of water is
  suddenly loose downstream.
• Flash floods move so fast they have the power to
  tear out trees, destroy buildings, and break
  bridges.

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Sources

• Information
• http//www.livescience.com/environment/lightning_s
  cience.html
• http//weatherwizkids.com/index.htm
• http//fema.gov/kids
• http//wwwworldstory.net/en/tunder.html
• http//weathereye.kgan.com/expert/blizzard/wnstrom
  s.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
  

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Sources

• Pictures
• http//www.howtosurviveit.com/tornado-natural-disa
  ster-400a061807.jpg
• www.pntmc.org.nz/photos/Wanganui/pages/Flood_2.
  html
• ed101.bu.edu/.../mattwall/Extreme20Weather.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
• Remove frame 
• www.topnews.in/regions/greece