Weather

1
Weather

• Natural Disasters

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WEATHER

• The state of the air around us.
• We measure the air as hot or cold, wet or dry,
  calm or stormy, clear or cloudy.
• Temperature-how we measure the air as hot or
  cold.
• Humidity-how we measure the air as wet or dry.

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Hurricanes

• Hurricanes begin as tropical storms.
• Hurricanes are large wind storms with winds
  blowing faster than 74 miles per hour!!! They
  can be miles across.
• Hurricanes happen over a body of water when there
  is warm water, a lot of moisture in the air, and
  a certain wind pattern.
• Hurricanes bring rain, thunder, lightning, and
  sometimes tornadoes.

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How We Measure Hurricanes

• There are five categories of hurricanes.
• Hurricanes in category 1 are the least damaging.
  Winds can get up to 95 miles per hour. Most
  buildings are safe, although mobile homes may be
  at risk because of the high winds. Some coastal
  flooding might occur.
• A Category 5 Hurricane is the most damaging. It
  can reach winds of 155 miles per hour or higher.
  Many buildings and roofs are at risk, with heavy
  flooding. Massive evacuation may be required.

5
TORNADOES

• Tornadoes are dangerous wind storms that occur on
  dry land. They are smaller than hurricanes.
• They happen when warm moist air mixes with hot
  dry air, or warm mist air mixes with cold air.
• Most tornadoes happen in Tornado Alley.

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FLOODS

• They can happen because of too much rain and the
  rain has no where to go.
• They occur when a barrier, like a dam, breaks and
  the water is free to flow.
• Floods occur, or happen, when there is too much
  water in one place.
• Hurricanes can also cause floods when there eye
  wall hits shore.

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EARTHQUAKES

• Earthquakes happen when plates of the earth
  collide.
• One plate goes under, and one plate goes up.
  This is how mountains are formed.
• Big earthquakes can kill many people. They can
  cause buildings, bridges, and even roads to
  collapse.

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BLIZZARDS

• Blizzards are dangerous snow storms.
• There are three conditions for a blizzard.
• Strong winds over 35 miles per hour (mph).
• It must be snowing so hard, you cant see farther
  than 4 football fields away.
• It must be snowing this hard for at least 3
  hours.
• In one blizzard, it snowed more than 5 feet in
  one day!!!

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VOLCANOES

• Volcanoes happen when magma breaks through the
  outer crust of the earth.
• Magma is very hot, melted rock in the center of
  the earth.
• When the liquid magna (lava) cools, it becomes
  igneous rock.
• Hawaii and Japan are islands that were formed
  from volcanoes.