Unformatted text preview: water or tiny crystals of ice droplets Clouds are classified based on their form Clouds form and height height Cloud forms Cloud Cirrus: high, white, and thin. Feathery high, appearance appearance Cumulus: Consist of globular, individual Consist cloud masses cloud Stratus: Described as sheets or layers Described that cover much of the sky that Cloud heights Cloud High: Bases that lie above 20,000 feet Middle: Bases that lie between 6500 and Bases 20000 feet 20000 Low: Clouds that lie below 6000 feet Clouds above the Earth’s surface above High clouds High Consist Consist of cirrus, cirrostratus and cirrocumulus cirrocumulus Cirrus clouds are wispy Cirrocumulus consist of fluffy masses Cirrostratus consist of layers Middle clouds Middle Consists of altocumulus and altostratus Low clouds Low Consists Consists of stratus, stratocumulus, and nimbostratus nimbostratus Stratus: Uniform layer of cover much of Stratus: the sky; occasionally brings light precipitation precipitation stratocumulus: clouds appear as long stratocumulus: parallel rolls or broken globular patches parallel Nimbostratus: Low lying clouds that are Nimbostratus: one of the chief rain producers one Clouds of vertical development Clouds These These clouds are associated with unstable air air Cumulonimbus cloud: A cumulus cloud Cumulonimbus that develops vertically that Cumulonimbus clouds are associated with Cumulonimbus rain showers and thunderstorms rain Mechanisms which causes air to rise rise Orographic lifting Frontal wedging Convergence Localized convective lifting Orographic lifting Orographic Air Air is forced to rise over a mountainous barrier barrier Occurs when mountains act like barriers to Occurs the flow of air the Frontal wedging Frontal Warmer, Warmer, less dense air is forced over coooler, denser air coooler, When masses of warm and cold air When collide, it produces a front front Convergence Convergence This This is when air masses in the lower atmosphere flow together, and lifting results results The basis of cloud formation : Adiabatic cooling Adiabatic Adiabatic Adiabatic temperature change: Cooling/warming of air caused when air is allowed to expand or is compressed. allowed When air is allowed to expand, it cools, When when it is compressed, it warms whe...
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- Fall '10
- Precipitation, Water vapor, fog, State Water