Air Masses and Fronts
Source Regions, Classification, Properties Of Air Masses, Fronts, Cold Fronts, Warm FrontsStationary fronts
An air mass is an extensive body of air that has a relatively homogeneous temperature and moisture content over a significant altitude. Air masses typically cover areas of a few hundred, thousand, or million square kilometers. A front is the boundary at which two air masses of different temperature and moisture content meet. The role of air masses and fronts in the development of weather systems was first appreciated by the Norwegian father and son team of Vilhelm and Jacob Bjerknes in the 1920s. Today, these two phenomena are still studied intensively as predictors of future weather patterns.
In some instances, the collision of two air masses results in a stand-off. Neither mass is strong enough to displace the other, and essentially no movement occurs. The boundary between the air masses in this case is known as a stationary air mass and is designated on a weather map by a solid line with triangles and half circles on opposite sides of the line. Stationary fronts are often accompanied by fair, clear weather, although some light precipitation may occur.
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"Genesis of Fronts and Airmasses." Weatherwise (December 1985): 324-328.
David E. Newton
- Air Pollution - Criteria pollutants
- Air Masses and Fronts - Source Regions
- Air Masses and Fronts - Classification
- Air Masses and Fronts - Properties Of Air Masses
- Air Masses and Fronts - Fronts
- Air Masses and Fronts - Cold Fronts
- Air Masses and Fronts - Warm Fronts
- Air Masses and Fronts - Occluded Front
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