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  • 1. What is Weather?Lesson 3
  • 2. VocabularyAtmosphere: The air around Earth
  • 3. Oxygen: A gas that all living thingsneed, and that plants give off into theair
  • 4. Weather: What is happening in theatmosphere at a certain place and time
  • 5. Temperature: The measure of how hotor cold something is
  • 6. Anemometer: A weather instrumentthat measures wind
  • 7. The air around Earth is the atmosphere. Theatmosphere is important because it has oxygen andalso has gases that plants need to live.Water vapor is in the atmosphere. Clouds form fromwater vapor. Rain, snow, and other kinds ofprecipitation fall from clouds.
  • 8. Types of Clouds1. Cirrus Clouds: are the highest clouds. Theylook like wisps of hair. Do not produceprecipitation that reaches Earth.
  • 9. 2. Cumulus Clouds: are lower than cirrusclouds, they look puffy. They can bring strongstorms with rain and hail.
  • 10. 3. Stratus Clouds: are the lowest clouds. Theylook like a sheet or a layer of clouds. Usuallybrings rain, sleet, or snow.
  • 11. • The weather in aplace dependson where theplace is.
  • 12. Weather instruments help gather weather data.• Thermometer: used to find thetemperature. Hot or cold a place is.• Anemometer: measures windspeed.
  • 13. Dangerous weather changes are sometimescalled severe weather. They bring heavyrain, snow, lightning, high winds, and bigtemperature changes may also happen.The kind of weather depends on thetemperature, the speed and direction ofwind, and the precipitation.
  • 14. People use weather instruments to predictweather. One instrument that is used to predictweather is a weather satellite. A weathersatellite in space may take pictures of cloudsthen sends the pictures to Earth and people usethe pictures to see how clouds move.
  • 15. • bring heavy rain and high winds.• Hail and lightning happen.• occur during hot weather• sometimes have strong winds
  • 16. • is a spinning column of air thattouches the ground.• happen in some strongthunderstorms.• They are very dangerous.• Precipitation: rain and hail arepossible• Temperature: generally warm• Wind: very strong
  • 17. Floods• happen when a lot of rain falls in a short amountof time.• Rivers and ditches can overflow and causeproblems.• Temperature: usually warm or mild• Wind: wind speed may change during flooding
  • 18. Drought• is a time with very dry weather.• the dryness lasts for a long time.• Rivers and lakes can begin to dry up.Temperature: may change during drought• Wind: windspeed may change duringdroughts
  • 19. Blizzards• happen in the winter when it is cold andbelow freezing.• They bring heavy snow and strong, cold winds.• Precipitation: snow—mostly heavyTemperature: below 0°C (32°F)• Wind: at least 56 kilometers per hour (35miles per hour)
  • 20. Hurricanes• are the largest storms on Earth.• They form over oceans when the water is warm.• can cause tornadoes and thunderstorms to form.• Precipitation: rain - mostly heavy• Temperature: generally warm• Wind: at least 119 kilometers an hour(74 miles an hour)
  • 21. Heat Wave• When the temperature is very hot for a longtime, a heat wave may be happening.• Heat waves last from a few days to severalweeks. They can be very dangerous.• Precipitation: rain is possible• Temperature: generally from 35°C (95°F) to 44°C(110°F)and above• Wind: wind speed may vary during a heat wave
  • 22. Ice storms• happen in the winter when rain freezes on things.• The ice can be heavy enough to break power linesand damage trees. The slippery ice can make walkingor driving difficult.• Precipitation: precipitation falls as rain, but freezeswhen it lands• Temperature: around 0°C (32°F)• Wind: wind speed may change duringthe storm