Air Masses GEoDe CD. (Great) Lakes Effect Snow Cold cP (continental polar air from Canada) moves over the warm lakes and picks-up moisture that’s evaporating.

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Presentation transcript:

Air Masses GEoDe CD

(Great) Lakes Effect Snow

Cold cP (continental polar air from Canada) moves over the warm lakes and picks-up moisture that’s evaporating. The warm air rises, form clouds. The clouds move over land (east side of the lake) and dumps precipitations (lots of snow!)

Mid-latitudes

What is an Air Mass? Immense body of air 1000 miles across, several km thick. Characteristics: –Similar temperature –Similar moisture (humidity) –It moves –It originates in a source region –It brings constant weather conditions

Source Region where the air mass starts Where air masses originate Have uniform physical characteristics Large areas The air stays put (stagnates) long enough to reach equilibrium. Does NOT have irregular topography (its FLAT: no mountains, land & water) It does NOT have cyclones

Continental (land)Polar COLD Maritime (water)Tropical: WARM

Air masses TemperaturePolar or ArcticTropical Moisture / Humidity Continental Maritime Cold, frigid air hot, warm air Dry land Wet ocean cP or cA cT mP mT

North American Air Masses

What air mass(s) influence OUR weather?

LOW pressure: Warm, moist air HIGH pressure: cold, dry air

Global Air Masses

Source Regions cA _____________________________

cT: __________ ___________ LATITUDE ____________ _____________

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