1. Air Masses GEoDe CD

2. (Great) Lakes Effect Snow

3. 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!)

5. Mid-latitudes 90 60 30 0 30 60 90

6. 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

7. 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

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

9. 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

10. North American Air Masses

11. What air mass(s) influence OUR weather?

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

13. Global Air Masses

14. Source Regions cA _____________________________

15. cT: __________ ___________ LATITUDE ____________ _____________