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Gravity
Air resistance
Curvature Effect
Solute EffectPure Water:High Vapor pressureSmall rain drop
Salty Water:Low Vapor pressureLarge rain drop
Terminal velocity
0.0001
0.001
0.01
0.1
1
10
100
1000
10000
0.0001 0.001 0.01 0.1 1 10
Drop radius (mm)
Rain
Drizzle
0.5 mm 5 mm
Cloud
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
Virga
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
5.5 inches
Polarized light
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