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  1. 1. What are they? How do they form? What types are there?
  2. 2. What is a cloud? A visible collection of water droplets or frozen crystals of water that are suspended above the surface of the earth.
  3. 3. How are clouds formed? All air contains water, but near the ground it is usually in the form of an invisible gas called water vapor. When warm air rises, it expands and cools. Cool air can’t hold as much water vapor as warm air, so some of the vapor condenses onto tiny pieces of dust that are floating in the air and form as a tiny droplet around each dust particle. When billions of these droplets come together they become a visible cloud.
  4. 4. Why are they white? They are white because they reflect the light of the sun
  5. 5. Cloud Prefixes High Clouds Middle Clouds Cirro = clouds above 18,000 feet Alto =6,500 fee to 18,000 feet above ground Strato = Ground level to 6,500 feet Low Clouds Cloud Prefixes are: Cirro is for High Clouds Alto is for Middle Clouds Strato is for Low Clouds
  6. 6. Types of clouds CUMULUS:CUMULUS: Latin word meaning heap White puffy clouds Seen on a sunny day, the wind blows them around These are the clouds you can see shapes in
  7. 7. Cumulus clouds Notice the blue sky, white puffy clouds Can you see an animal in the cloud in the center? I can
  8. 8. Types of Cumulus Clouds Cirrocumulus Clouds  Small rounded white puffs that appear in long rows. Small ripples sometimes resemble the scales of a fish. Usually seen in winter and indicate fair, but cold weather. In tropical regions them may indicate an approaching hurricane.
  9. 9. Types of Cumulus clouds Alto Cumulus = mid level clouds made of water droplets and appear as gray puffy masses. If you see them on a warm sticky summer morning, be prepared to see thunderstorms in the late afternoon.
  10. 10. Types of Cumulus clouds Stratocumulus Clouds = low, puffy and gray, most are in rows with blue sky between. Rain rarely occurs with stratocumulus clouds.
  11. 11. Types of clouds STRATUSSTRATUS: Latin root means layered Usually seen on a rainy day Like a blanket of light gray in the sky You can’t tell where one cloud ends and another begins
  12. 12. Stratus Clouds Notice how it looks like a blanket? Some of the clouds are lighter than others.
  13. 13. Types of stratus clouds Thin sheetlike high clouds that often cover the entire sky. Usually come 12-24 hours before snow or rain. Cirrostratus
  14. 14. Altostratus Clouds Gray or blue-gray mid-level clouds Usually cover the entire sky Form ahead of storms with continuous rain or snow
  15. 15. How are these clouds different? Cumulus clouds Stratus clouds
  16. 16. Cloud types Cirrus CloudsCirrus Clouds Thin and wispy High in the sky Made of ice crystals Seen on a fair day Point or curl in the direction the wind is moving Usually indicate a change in the weather within 24 hours
  17. 17. Cirrus Clouds See how you can almost see through these clouds? They also have “tails” that point in the direction the air is moving (what is moving air called?)
  18. 18. Types of clouds NimbusNimbus (latin means cloud) Is giving off rain or snow (what is this called?) Dark gray Usually cover the whole sky Can produce a thunderstorm or tornado
  19. 19. Nimbus Clouds You can see how dark they are. Sometimes they are not quite so dark, but they usually have rain or snow with them.
  20. 20. How are these different? Nimbus clouds Stratus clouds
  21. 21. How are these clouds different? Cumulus clouds Cirrus clouds