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Whats Up With That Weather

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What's Up With That Weather? Why Does It Rain? When rain clouds are pushed up into cold air the ... Water from the sea, rivers, lakes, ponds, pools and ... – PowerPoint PPT presentation

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Title: Whats Up With That Weather


1
Whats Up With That Weather?
2
Why Does It Rain?
  • When rain clouds are pushed up into cold air the
    rain drops form and become heavy enough to be
    pulled to the ground by gravity.
  • Water from the sea, rivers, lakes, ponds, pools
    and puddles is heated by the sun and evaporated
    into water vapor.
  • Clouds are made up of millions of tiny water
    vapor droplets, which cling together.

3
Whats Snow?
  • Snow falls from clouds that contain enough cloud
    droplets and ice crystals for precipitation to
    form.
  • In order for snow to reach the ground without
    melting, the wet bulb temperature of the air near
    the ground must be below freezing.
  • The wet bulb temperature is the temperature
    measured by a thermometer that has a little wet
    sock covering the bulb before it is swung in a
    circle in the air.
  • Thus, you can have snow fall reaching the ground
    even when the air temperature is slightly above
    freezing.

4
Hurricanes
  • Hurricanes are severe tropical storms that form
    in the southern Atlantic Ocean, Caribbean Sea,
    Gulf of Mexico, and in the eastern Pacific Ocean.
  • Hurricanes gather heat and energy through contact
    with warm ocean waters. Evaporation from the
    seawater increases their power.
  • Hurricanes rotate in a counter-clockwise
    direction around an "eye."
  • Hurricanes have winds at least 74 miles per hour.
  • When they come onto land, the heavy rain, strong
    winds and heavy waves can damage buildings, trees
    and cars.
  • The heavy waves are called a storm surge.
  • Storm surges are very dangerous and a major
    reason why you MUST stay away from the ocean
    during a hurricane warning or hurricane.

5
Lightning
  • The action of rising and descending air within a
    thunderstorm separates positive and negative
    charges.
  • Water and ice particles also affect the
    distribution of electrical charge.
  • Lightning results from the buildup and discharge
    of electrical energy between positively and
    negatively charged areas.
  • Most lightning occurs within the cloud or between
    the cloud and ground.

6
The Blowing
  • Wind is moving air.
  • The sun makes the wind blow.
  • The energy in wind comes from the sun.
  • When the sun shines it heats the earth.
  • The air over the land gets hotter then the air
    over the water.
  • The hot air raises and cooler air rushes in to
    take its place.
  • The moving air is wind.

7
El Niño
  • In the tropical Pacific, trade winds generally
    drive the surface waters westward.
  • The surface water becomes warmer going westward
    because of its longer exposure to solar heating.
  • El Niño is observed when the easterly trade winds
    weaken, allowing warmer waters of the western
    Pacific to migrate eastward and eventually reach
    the South American Coast.
  • The cool nutrient-rich sea water normally found
    along the coast of Peru is replaced by warmer
    water depleted of nutrients, resulting in a
    dramatic reduction in marine fish and plant life.

8
References
  • Suggested Reading
  • Why Does Lightning Strike?
  • Elmer's Weather
  • Sandra's Sun Hat
  • Suggested Websites
  • The Water Cycle
  • Rain
  • The Weather Channel
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