Air Masses & Weather Patterns. Question of the Day. What is an Air Mass?. Air Masses. Movements of large bodies of air that originate at a source region Characterized by temperature and moisture content Important because they cause atmospheric disturbances. Classifying Air Masses.
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What is an Air Mass?
Regions between southern Florida and Alaska.
Primary weather producer is middle-latitude cyclone (low pressure system by meteorologists)
Warm surface air replaces area where cooler air was
Red line with semicircles on a weather map
Change in types of clouds as front approaches
Light to moderate precipitation over a large area and for an extended period of time
Cold air moves into region where warmer air is
Blue line with triangles on a map
Heavy Precipitation over a shorter duration and gusts of wind
Cooler temperatures after storm clears
Cold Mass and Warm Mass air meet
Line with blue triangles and red semicircles on map
No movement or slow movement of air masses so gentle/moderate precipitation for days
Fast moving cold front over takes a warm front
Heavy rain at first then light rain as it dissipates.
Can have cold-type and warm-type occluded fronts
Based upon humidity
Generate severe thunderstorms from Texas to Nebraska along Great Plains