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Air Masses Areas of air that have about the same density, temperature, humidity, and pressure. Cold air masses usually move south towards the equator. Warm air masses usually move north away from the equator. Types of air masses Maritime (m) – moist air from over the water Continental (c) – dry air from over the land Polar (P) – cool air masses from a sub polar region Tropical (T) – warm air from near equator Arctic (A) – VERY cold air coming from the Arctic Combine the above to form air masses: – mP, cP, mT, cT, cA Fronts Fronts are where air masses meet Weather most often occurs along “fronts” Four different types of fronts: – Cold Fronts – Warm fronts – Occluded fronts – Stationary fronts Cold Front Warm Front Occluded Front When a cold front catches up to a warm front Stationary Front Clouds and precipitation at the fronts Occluded Front clouds and precipitation Low pressure and high pressure systems (Backwards from previous slide) “Cyclogenesis” Typical Low Pressure System More Animations http://www.mesoscale.iastate.edu/agron206/animations/0 5_cnWfronts.html http://www.classzone.com/books/earth_science/terc/conte nt/visualizations/es2002/es2002page01.cfm?chapter_no=vi sualization Cyclogenesis http://www.physicalgeography.net/fundamentals/7s.html Assignment In groups of 2 (assigned by cards): Locate the Air masses on map with temperatures provided. After you do this, compare the data with a map that has weather stations on it. It should take no more then 15 minutes to do this.