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Cloud Types
Clouds are formed in 2 basic ways: 1. by rising air currents (cumulus) 2. by a layer of air cooled below the saturation point (stratus)
High Clouds Cirrus. Thin, feathery, made of ice crystals. No shadows. Cirrocumulus. Rare. Thin, patchy; form wavelike patterns. True mackerel sky. No shadows. Cirrostratus. Thin sheets, gauzelike, made of ice crystals. Form halos around sun and moon.
Middle Clouds (bases at 10,000 ft) Altostratus. Dense veils or sheets, gray or blue, may be fibrous or lightly striped. No halos. Sun appears as through frosted glass. Altocumulus. Patched or layers of puffy gray or whitish clouds. Larger puffs than cirrocumulus. Sun produces a corona (pale blue or yellow inside, reddish outside).
Low Clouds (bases from surface to 6,500 ft) Stratus. Low, uniform sheet. May be dull gray and may produce drizzle only. Nimbostratus. Rain clouds, dark, wet looking. Often accompanied by Fractostratus in wind. Stratocumulus. Irregular masses of clouds in rolling or puffy layer. Gray with darder shading. No rain but may change into Nimbostratus.
Towering Clouds (surface to 14,000 ft) Cumulus. Puffy. Form over land in daytime by rising warm air, disappear at night. Herald fair weather. Cumulonimbus. Thunderheads. Bases close to ground; updrafts lift tops to 75,000 ft sometimes. Anvil tops. May produce tornadoes.
This page last modified on 9 December 2008 08:09:55 PM (active 600 days) |
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