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Weather Section 2

Air Mases and Fronts

causes changes in the weather the movement and interaction of air masses
a large body of air that has similar temperature and moisture throughout air mass
(T), forms over the tropics, warm air tropical air mass
(m), forms over water, wet air maritime air mass
(c), forms over land, dry air continental air mass
(P), forms over the polar regions, cold air Polar air mass
northern Canada, North Atlantic Ocean, North Pacific Ocean places where polar air masses form and cause cold winter weather in the U.S.
A warm air mass that influences the weather in the U.S. and develops over land continental tropical (cT)
air masses that cause hurricanes and thunder storms that occur on the East Coast and in the Midwest maritime tropical (mT)
What happens when two types of air mases meet warm air rises
The boundary between air masses of different densities and usually different temperatures a front
A warm air mass that moves over a cold, denser air mass warm front
A warm air mass that is caught between two colder air masses occluded front
A cold air mass that meets a warm air mass, but the two remain separated stationary front
A cold air mass that moves under a warm, less dense air mass cold front
causes thunderstorms and heavy rain cold front
causes drizzly rain, and then clear, warm weather warm front
causes cool temperatures and large amounts of rain and snow occluded front
stationary front causes many days of cloudy, wet weather
An area in the atmosphere that has lower pressure than the surrounding areas, with winds spiraling toward the center is a cyclone
A rotation of air around a high pressure center is called an anticyclone
when colder, dense air spirals out of the anticyclone, and moves toward an area of low pressure How a cyclone is formed
How a cyclone affects the weather It causes stormy weather
How an anticyclone affects the weather It causes dry, clear weather
Created by: chemingway