Clouds and precipitation

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Cloud powerpoint for weather unit.

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Clouds and precipitation

  1. 1. Clouds <ul><li>What are clouds? </li></ul><ul><li>How are they formed? </li></ul><ul><li>What do they indicate about the weather? </li></ul>
  2. 2. What Causes Clouds? Building on What We Know <ul><li>Sun heats surfaces. </li></ul><ul><li>Surfaces heat the air . </li></ul><ul><li>Warm air rises. </li></ul>
  3. 3. What Causes Clouds? Step 1: Evaporation <ul><li>Liquid water e vapor ates into water vapor. </li></ul><ul><li>Liquid changes to gas. </li></ul>
  4. 4. What Causes Clouds? Evaporation <ul><li>Water vapor rises with warm air </li></ul><ul><li>Liquid water e vapor ates, becoming vapor, or gas </li></ul><ul><li>Water vapor fits in between air molecules </li></ul><ul><li>Notice warm air holds more water vapor than cold air. </li></ul>
  5. 5. What Causes Clouds? Step 2: Condensation <ul><li>Water vapor cools along with the air as it gets farther from Earth’s surfaces. </li></ul><ul><li>D roplets attach to dust particles. </li></ul><ul><li>Clouds form . </li></ul><ul><li>Vapor condenses into tiny drops of liquid water. </li></ul>
  6. 6. What Causes Clouds to Form? A Summary: <ul><li>Sun’s energy heats water. </li></ul><ul><li>Water evaporates into water vapor. </li></ul><ul><li>Vapor rises with warm air. </li></ul><ul><li>Vapor cools. </li></ul><ul><li>Vapor condenses into water droplets . </li></ul><ul><li>Clouds form. </li></ul>
  7. 7. What Are the Three Main Types of Clouds?
  8. 8. Cumulus Clouds Puffy Flat bottoms Formed from water droplets Indicate fair weather
  9. 9. Cumulus Clouds
  10. 10. Cirrus Clouds <ul><li>High in the sky </li></ul><ul><li>Formed from ice crystals </li></ul><ul><li>Shaped like thin threads or feathers </li></ul><ul><li>Indicate warm air and moisture coming </li></ul>Mares’ tails
  11. 11. Stratus Clouds <ul><li>Low in the sky </li></ul><ul><li>Formed from water droplets </li></ul><ul><li>Cover the sky like a blanket </li></ul><ul><li>Indicate rain or snow </li></ul>
  12. 12. Stratus Clouds
  13. 13. Other Types of Clouds <ul><li>Mixed together </li></ul><ul><li>Cirro+cumulus </li></ul><ul><li>High up </li></ul><ul><li>Hard to see </li></ul><ul><li>Small, fleecy like sheep </li></ul><ul><li>Mouton or mackerel sky </li></ul>Cirrocumulus
  14. 14. Cirrostratus <ul><li>High up </li></ul><ul><li>Cover sky in thin, milky-white sheets </li></ul><ul><li>Form halo </li></ul><ul><li>Bed-sheet clouds </li></ul>
  15. 15. Cumulonimbus
  16. 16. Name the Three Main Types of Clouds Cumulus Stratus Cirrus
  17. 17. Thanks to…. <ul><li>www.googleimages.com </li></ul><ul><li>Annie Lenox “Why” </li></ul><ul><li>Mrs. McColgan’s photos </li></ul>

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