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Aim: How do clouds form? Do Now: Answer these questions in order to understand how clouds are made.

Aim: How do clouds form? Do Now: Answer these questions in order to understand how clouds are made. How can you make the air saturated with tiny water droplets (vapor)? What needs to occur to make the water condense? If water droplets are small enough, are they more or less dense than air.

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Aim: How do clouds form? Do Now: Answer these questions in order to understand how clouds are made.

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  1. Aim: How do clouds form? Do Now: Answer these questions in order to understand how clouds are made. • How can you make the air saturated with tiny water droplets (vapor)? • What needs to occur to make the water condense? • If water droplets are small enough, are they more or less dense than air.

  2. I. Formation of Clouds • Clouds form when air is cooled to the Dew Point Temp. • Air cools when it rises because it expands due to the lower pressure.

  3. 3. The cooled water vapor condenses around small solid particles called condensation nuclei.

  4. A. Orographic lifting: • Mountains act as barriers and block the air, forcing the parcel of air to ascend. • This causes the air to expand because the atmosphere is thinner at higher altitudes. • The air cools due to this expansion, which lowers the temperature closer to the Dew Point temperature and increasing the RH.

  5. Sunny and Dry Cool and Wet

  6. II. Cloud Types: • Cirrus: light and feathery. • - Composed of ice crystals. • 2. Cumulus: “puffy cotton balls” • 3. Stratus: smooth layered clouds • - “pancake clouds”

  7. III. Fog • Is a cloud in contact with the ground. • Most types of fog form when the relative humidity reaches 100% at ground-level.

  8. IV. Precipitation - occurs when cloud droplets or ice crystals grow heavy and fall to the Earth.

  9. Rain: all liquid water. • Sleet: ice crystals partly melt while falling. • Snow: vapor changes directly into ice crystals. • Glaze: rain or sleet freezes when touching the cold ground. • Hail: rain drops are blown up by wind freezing into ice pellets.

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