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Chapter 2 Weather Factors Sections 4 and 5 Water in the Atmosphere and Precipitation

Chapter 2 Weather Factors Sections 4 and 5 Water in the Atmosphere and Precipitation. Humidity. Humidity is a measure of the amount of water vapor in the air. Relative humidity is the % of water vapor in the air compared to the maximum amount the air could hold. Dew Point.

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Chapter 2 Weather Factors Sections 4 and 5 Water in the Atmosphere and Precipitation

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  1. Chapter 2Weather FactorsSections 4 and 5Water in the Atmosphere and Precipitation

  2. Humidity • Humidity is a measure of the amount of water vapor in the air. • Relative humidity is the % of water vapor in the air compared to the maximum amount the air could hold.

  3. Dew Point • The temperature at which condensation begins.

  4. Types of Clouds • Meteorologists classify clouds into three main types: • Cumulus = looks like cotton balls, low to the ground (2km to 18km), usually mean fair weather except for cumulonimbus clouds which bring thunderstorms • Stratus = flat gray layers, middle altitudes, cover all or most of the sky making it cloudy out and can lead to drizzling, rain, or snow • Cirrus = wispy feathery clouds, form at high altitudes with cold temperatures, made of ice crystals

  5. What Is Precipitation? • Precipitation - Any form of water that falls from clouds and reaches Earth’s surface.

  6. Rain • Most common type • At least 0.5 mm in diameter

  7. Sleet • Ice particles smaller than 5 mm • Rain which freezes through a layer of cold AIR

  8. Freezing Rain • Raindrops which freeze when they touch a cold surface.

  9. Hail • Pellets of ice larger than 5 mm. • Forms only inside cumulonimbus clouds during thunderstorms.

  10. Snow • Water vapor in a cloud that is changed directly into ice crystals.

  11. Review Questions • Pg. 66 = #1-3 • Pg. 70 = #1-4 • Complete sentences and everyone turns in their own paper.

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