Earth Science 20.1, Air Masses
Terms in this set (21)
What is an immense body of air that is characterized by similar temperatures and amounts of moisture at any given altitude?
An air mass
What is it called when an area experiences fairly constant weather because of an approaching air mass?
What temperature and moisture does an air mass carry?
The temperature and moisture from the place it left
As an air mass moves, the characteristics of an air mass ___ and so does the weather in the area which the air mass moves. What is this called?
Change (air mass moderation)
What is the area that an air mass gets its characteristics from called?
What are air masses that form at high latitudes toward Earth's poles and are cold?
Polar air mass
What are air masses that form at low latitudes and are warm?
Tropical air mass
In addition to their overall temperature, air masses are classified according to what?
The surface which they form
Where do continental air masses form? Where do maritime? Which is dry? Which is humid?
Continental- land (dry)
Maritime- water (humid)
What two types of air masses heavily influence North America, especially weather east of the Rockies?
Continental Polar and Maritime Tropical
What are characteristics of continental polar air masses?
Cold and dry
Are continental polar air masses associated with heavy precipitation?
Do continental polar air masses bring snow to leeward or windward sides of lakes?
What are localized snow storms caused by continental polar air masses called?
What are characteristics of maritime tropical air masses?
Warm, loaded with moisture, and unstable
What is the source of much of the precipitation received in the eastern two thirds of the United States?
Maritime Tropical Air Masses
What is a midlatitude cyclone, that can be very intense, that travels up the US east coast? Before and during the storm, the wind direction is from the northeast.
What type of air mass is a Nor'easter associated with?
Which type of air masses have the least influence on the weather of North America?
Continental Tropical air masses
What type of conditions do CT air masses cause in the summer?
Extremely hot, droughtlike conditions
What is mild weather in the Great Lakes during the fall that results from the movement of CT air masses?
An Indian summer
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