Earth

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Earths Weather

• by Denise Carroll

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Changes in Weather

• Weather is what the air is like outside.
• Weather can be warm or cool.
• Weather can be sunny, windy, or cloudy.
• Weather can change quickly.
• There are four seasons during the year.

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The Four Seasons
1. Spring begins in March.

• The air is warm, windy, and rainy.
• Trees begin to grow new leaves and flowers.
• Warm air and rain helps plants grow new leaves
  and flowers.

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The Four Seasons
2. Summer begins in June.

• The days are hot and sunny.
• This is the warmest time of the year.
• Leaves are green on trees.
• Storms can make the weather change quickly.

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The Four Seasons
3. Fall or Autumn begins in September.

• The air begins to get cooler.
• The leaves of some trees change colors and drop
  off.
• Some plants die.

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The Four Seasons
4. Winter begins in December.

• The air is cold.
• Some places have snow.
• Winter is the coldest time of the year.
• Many trees have lost their leaves.

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The Water Cycle

• A water cycle is the way water moves from the air
  to land and back again.

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Condensation

• The water vapor rises into the air, cools, and
  condenses into tiny droplets of water.
• The drops of water come together to form clouds.

Water Cycle
Precipitation
Evaporation is when a liquid changes to a gas.
The water drops become heavy and fall as rain,
sleet, snow, or hail.

• The suns heat makes water evaporate into water
  vapor.

The rain falls or snow melts and flows to
rivers, lakes, and oceans.
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Meteorologists

• Meteorologists are scientists who use special
  tools to measure, predict, and study weather
  conditions.

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Measuring Weather Conditions

• A thermometer measures temperature, or how hot or
  cold the air is.

• A rain gauge measures how much rain or snow has
  fallen.

• An anemometer measures how fast the wind is
  blowing.

• A wind vane shows which direction the wind is
  blowing. It points to the direction the wind is
  coming from.

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ThinkWhy do we need to know the weather
conditions each day?
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Measuring weather conditions helps people.

• People will know how to dress when they go
  outside.
• People can plan outdoor activities or vacations.
• Scientists can tell people to get ready for bad
  weather or a big storm.
• Measuring the weather conditions help scientists
  predict the weather.

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Clouds

• Clouds are made up of millions and millions of
  small water drops or tiny pieces of ice.
• Clouds give us clues about how the weather may
  change.
• We will learn about these three types of clouds.

1. Cumulus
2. Cirrus
3. Stratus

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Cumulus

• Cumulus means heap.  These clouds look big and
  puffy like balls of cotton.
• When these clouds start piling up and turn dark,
  they can bring a storm.

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Cirrus

• Cirrus means curl.  These clouds are very high up
  in the sky. 
• They look thin or feathery and hold only a little
  bit of water.
• We see these clouds when the weather is sunny.

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Stratus

• Stratus means stretched out.  These clouds make
  the whole sky look dark and gray because they
  cover the sky and block the sun.
• Stratus are low, gray clouds that usually bring
  rain or snow.

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Preparing for Weather

• Always listen to the radio and television for
  weather bulletins.
• Stock a good supply of food that does not have to
  be cooked.
• Store plenty of fresh water.
• Make sure you have flashlights and extra
  batteries, candles are not safe.
• Be sure your pets are safe.
• Secure loose objects outside your home.
• Always be calm and patient.

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Thunderstorms

• A thunderstorm has rain, thunder, and lightning.
• When we see big, thick, dark cumulus clouds, we
  might expect thunder and lightning to come.
• Lightning produces light and heat  - called
  energy.
• When the air is heated that quickly, it expands
  (gets bigger) and then contracts (gets smaller). 
  When the air expands and contracts, it creates an
  explosion called THUNDER.
• Lightning safety Stay indoors away from doors
  and windows. Do not use the telephone. Take off
  head sets. Turn off, unplug, and stay away from
  appliances, computers, power tools, TV sets.

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Tornado

• A tornado is a funnel-shaped cloud that spins
  very fast.
• It has very strong winds that can destroy many
  houses and buildings.
• It picks up debris or buildings by its swirling
  winds.
• Tornado safety Stay inside away from windows,
  doors and outside walls. Cover your head and body
  to protect yourself from flying objects.

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Hurricane

• A hurricane begins over warm ocean waters and has
  winds that are more than 74 mph.
• It has strong winds, high ocean waves, and lots
  of rain.
• It causes floods and destroys many homes and
  buildings.
• The hurricane season begins June 1 and ends
  November 30.
• Stay indoors, in the center of your home, in a
  closet or bathroom without windows.

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Blizzard

• A blizzard is a storm with heavy snow and strong
  winds.
• It is difficult to see outside during a blizzard.
• Blizzard Safety Stay indoors. If you go outside
  after the storm, wear layers of clothing.

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Congratulations

• You have learned about the four seasons, the
  water cycle, three types of clouds, storms, and
  how to be prepared for weather.
• Youre an expert weather watcher!
• REMEMBER TO ALWAYS BE SAFE!

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Resources

• http//images.search.yahoo.com
• http//office.microsoft.com/clipart
• http//soniacoleman.org/Tutorials/PowerPointTempla
  tes/templates1.htm