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Air Mass Modifications• Once an air mass moves from its source region, itnot only modifies the weather of the area it istraveling over, but it is also gradually modified bythe surface over which it is moving.• Modifications can result from:• temperature differences between an air mass andthe surface,• vertical movements induced by cyclones andanticyclones, or• topography.
cP and cA Air Masses• The day-to-day weather we experience depends onthe temperature, stability, and moisture content ofthe air mass we are experiencing.• Continental polar (cP) and continental arctic(cA) air masses are, as their classification implies,cold and dry.• Although cP air masses are not, as a rule,associated with heavy precipitation, those thatcross the Great Lakes during late autumn andwinter sometimes bring lake-effect snows to theleeward shores.
Page 1 and 2: Air MassesDr. R. B. Schultz
Page 3 and 4: Air Mass Source Regions• Areas in
Page 9 and 10: Lake Effect Snow Belts
Page 11 and 12: mP Air Masses• Maritime polar air
Page 13: Air Masses and Rainfall• Isohyets

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