8 Weather - Fronts Mountains Heat Capacity Latent Heat The...

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Unformatted text preview: Fronts Mountains Heat Capacity Latent Heat The Weather Clouds and Rain Cloud formation and precipitation is determined ultimately by the vertical movement of air . Upward motion enhances cloud formation Cloud formation leads to rainfall. Warm air holds more moisture than cold air. As warm air rises, it cools and cannot hold moisture Clouds Clouds form when moisture condenses from the atmosphere . When the moisture in clouds is sufficiently abundant, raindrops or snow falls to the earths surface. If clouds are condensed moisture (liquid water), how do clouds float in the air? How do Clouds Float? Size: 10 micons Velocity: 0.3 cm/sec or 10 meters/hr ETA: 350 hours (3500 m or 10,500 ft) Updrafts Evaporation Terminal Velocity It takes about 15 million cloud droplets to form the typical raindrop 120 to 200 mph Precipitation: Rainfall 70% of earth surface covered by oceans Ocean evaporation accounts for 90% of precipitation. 10% to land 90% to Oceans Residence time in atmosphere: 14 days Evaporation 4,200 bgd Rainfall Rainfall and Rainfall Types Frontal Orographic Convective Frontal Two masses of air of different temperature, humidity and density meet Warm air is lighter than cool air. Warm air rises over cool air. Cold Fronts and Warm Fronts Orographic Rainfall Warm moisture-laden wind blowing in to the land from the sea encounters a natural barrier Warm Moist air Air cools Rainfall Dry Air mountain Prevailing wind Ocean Orographic Lifting High rainfall Low rainfall Prevailing wind Rain shadow wet dry 39 18 110 The Mojave Desert Sierra-Nevada 5000-13,000 ft. Convective Rising of warm, moist air due to surface heating Equatorial Regions Florida Southeast Sun warms water or land Low pressure cools High Amounts of Solar Heating Moist Air Where?...
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8 Weather - Fronts Mountains Heat Capacity Latent Heat The...

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