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25.1 Air Masses

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Katelynn Dorn

on 9 March 2015

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Transcript of 25.1 Air Masses

Air Masses
wind patterns created by differences in air pressure
air moves from high to low pressure
convection cells and Coriolis effect
air mass- large body of air w/ uniform temp. and moisture content
source region
An air mass usually brings with it the weather of its source region, but it may change as it moves away.
1. Define air mass

2. What is the name of the air mass that forms over the Gulf of Mexico? What letter symbol would be used for this air mass?

3. If it's snowing on the Pacific Coast, what air mass probably caused it? What letter symbol would be used for this air mass?
Types of Air Masses
Image by Tom Mooring
North American Air Masses
25.1 Air Masses
Polar Air Masses
Continental polar Canadian- bring cool, dry or cold weather
Maritime polar Pacific- near Alaska, bring rain, snow, or fog to coast, bring cool/dry to mid-US
Maritime polar Atlantic- form over waters between Greenland and Iceland, bring cold, cloudy weather and precip. to E. Coast and Canada
Tropical Air Masses
continental tropical- form over deserts in Mexico and SW US, bring clear, dry, hot weather
maritime tropical Gulf and maritime tropical Atlantic- bring mild, cloudy weather, hot & humid, storms
maritime tropical Pacific- bring heavy precip. to coasts
classified according to source regions:
maritime polar
maritime tropical
continental polar
continental tropical
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