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Unformatted text preview: air streams over certain regions Source Regions o Air passes slowly over source region o Energy and moisture exchange between earth and atmosphere o High pressure dominates o Light winds o Homogeneous surfaces o Oklahoma and Great plains not a source region Air Masses o Very large (>1500 km) o Homogeneous within o Distinct species of air Classification o Abbreviations used o Stability and temp. implied by the classification A: Arctic AA: Antarctic P: Polar T: Tropical E: Equatorial c: continental m: Maritime mP: cool-wet cP: cold-dry 9/30/2010 cT: hot-dry mT: warm-wet modification o air masses pushed out of source areas o modification with distance from source region o thermal o dynamic o moisture Fronts o Boundaries between air masses o Sharp transitions: Temp. Density Humidify Stability...
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- Fall '08