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10/19/11 Air Mass
•  An immense body of air characterized by it’s
temperature and moisture content
•  Air-mass weather
Air Masses
o  Weather conditions associated with the air mass.
o  Examples
•  Bitter cold and dry
•  Warm and humid
•  Source region
o  Areas in which air masses originate
Chapter 8
Classifying Air Masses
•  5 types
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cA – continental artic
cP – continental polar
cT – continental tropical
mT – maritime tropical
mP – maritime polar
•  Artic
o  Very Cold
•  Polar
o  Cold
•  Tropical
o  Warm
Weather and Air Masses
•  5 types
o  cA – continental artic
•  Bitterly cold and very dry
o  cP – continental polar
•  Very cold and dry
o  cT – continental tropical
•  Hot and dry
o  mT – maritime tropical
•  Warm and humid
o  mP – maritime polar
•  Cool and humid
•  Maritime
o  Formed over water
•  Continental
o  Formed over land
Air Masses Modification
•  Modifies the weather of an area
•  The area can also modify the air mass.
o  Continental Polar cP
•  Cold and Dry
•  Moves south over warm water
•  Gains moisture
•  Increases in temp.
•  Becomes
o  Maritime Polar mP
Air Masses
•  Continental Polar and Continental Artic
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Cold Dry Air
Flows over warm water (great lakes)
Water evaporates
Air becomes unstable
Produce Lake effect Snow
Snowbelts – strips of land that receive high amounts of snow
1 10/19/11 Air Masses
•  Lake Effect Snow
Air Masses
•  Maritime Polar
o  Originates as Continental Polar
o  Brings storms to the west coast
o  North Atlantic mP
o  Nor’easter (NE Winds)
Air Masses
•  Maritime Polar
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Air Masses
•  Maritime Tropical
Nor’easter (NE winds)
Moist air comes from water
Cold air from north
Produces large storms
o  Warm Humid Air
o  Atlantic
•  A lot of rainfall to east U.S.
Isohyets – lines connecting places having equal rainfall
Air Masses
•  Maritime Tropical
o  Warm Humid Air
o  Pacific
•  Effects Mexico and SW
U.S.
•  Heavy rain – July and Aug.
Air Masses
•  Continental Tropical
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Warm dry air
Forms in Summer
Land area – Hot
Forms cT
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