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Gravity Air resistance
Solute Effect Pure Water: High Vapor pressure Small rain drop Salty Water: Low Vapor pressure Large rain drop
Table 7-1, p. 166
Bergeron Process (ice-crystal process) Ice grows at the expense of water drops.
Accretion (riming) Ice collecting suppercooled water drops Results in icy snow pellets called graupel
Aggregation Ice collecting small ice particles to make a snow flake
Fall Streaks -- icy crystals or snow falling
Dendrite snow crystal
Fig. 7-11, p. 172
Fig. 7-12, p. 173
Rime: super cooled drop freezing on contact
Freezing Rain: rain freezes on contact.
Fig. 7-21, p. 180
Fig. 7-23, p. 182 Days with Freezing rain
Fig. 5, p. 183
Fig. 7-18, p. 179
Chapter 7 Precipitation. An ordinary cloud droplet is extremely small (~20 micrometers) 100 times smaller than an average raindrop if in equilibrium…
Precipitation Chapter 7 Objectives Differentiate several ways that precipitation is formed Distinguish between several types of precipitation.
1. Clouds are made up of: A.Liquid water droplets B.Ice Crystals C.Water Vapor D.A combination of liquid water, ice, and water vapor.
Most collide on forward edge Some collide on backside About a million average sized droplets would be required to produce a raindrop! Terminal velocity:
18.3 Cloud types and Precipitation Clouds are classified on the basis of their form and height Clouds are classified on the basis of their form and height.
Chapter 7. Global Precipitation Climatology Project (GPCP) Most rain falls near the equator. Notice how dry it is on.
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Chapter 7 Precipitation Processes Chapter 7 Precipitation Processes.
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1 Understanding Weather Weather results from differences in pressure, heat, air movement, and humidity.
Types of Precipitation Precipitation comes in two forms Precipitation comes in two forms Liquid – rain, drizzle Liquid – rain, drizzle Solid - freezing.
Why does it rain on us???. 3 types of stability Two factors limiting the height of clouds 3 cloud properties, 9 ISCCP cloud types Why do clouds.
Hydrologic Cycle. Water Cycle The movement of water from the Earth’s surface into the air and back to the surface again
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Why does it rain on us???. 3 cloud properties, 9 ISCCP cloud types Why do clouds constitute a wildcard for climate change? Competition between greenhouse.
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