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Guided Notes on Moisture in the Atmosphere

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Guided Notes on Moisture in the Atmosphere Chapter 11, Section 3 1. Clouds form when warm, moist air rises, expands, and cools in a convection current. – PowerPoint PPT presentation

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Title: Guided Notes on Moisture in the Atmosphere


1
Guided Notes on Moisture in the Atmosphere
  • Chapter 11, Section 3

2
  • 1. Clouds form when warm, moist air rises,
    expands, and cools in a convection current.

3
  • 2. When air reaches the dew point, water vapor
    condenses around condensation nuclei, which are
    small particles in the atmosphere around which
    cloud droplets form. Examples of condensation
    nuclei are sea salt and dust. When millions of
    droplets collect, a cloud forms.

4
  • 3. Clouds also form through orographic lifting,
    which is when wind encounters a mountain and the
    air has no place to go but up.

5
  • 4. Sometimes clouds form when two air masses of
    differing temperatures collide. As warm air
    moves into an area of cool air, the bulk of it
    will be forced to rise over the more-dense, cold
    air. As warm air rises and cools, the water
    vapor in it condenses and forms a cloud.

6
  • 5. Air can become unstable if it is cooler than
    the surface beneath it. If temperature
    conditions are right and the air mass rises
    rapidly, it can produce the types of clouds
    associated with thunderstorms.

7
  • 6. As water vapor in the air condenses, heat is
    released. This heat warms the air. This latent
    heat can provide energy to a weather system,
    thereby increasing its intensity.

8
  • 7. When cloud droplets collide, they join
    together to form a larger droplet in a process
    called coalescence. Eventually the droplet
    becomes too heavy to be held aloft and the
    droplet falls to Earth as precipitation.

9
  • 8. Examples of precipitation include rain, snow,
    sleet, and hail.
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