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Air Mass Movement • Air Masses move based on differences in …. • Air pressure and density • Boundaries separating air masses of different densities are called fronts Cold Front • Cold air replacing warm air • Normally move northwest to southeast • Normally storms in front, drier air behind Cold Front Warm Front • Warm air replaces cold • Air normally more humid afterwards Warm Front Stationary Front • Warm and cold fronts meet and get stuck • Starts to move as one of the masses wins out Occluded Front • Cold front takes over a warm front • Forces warm air up, often results in rain Good/Bad Weather Clouds • Types/Heights of clouds? Wind Systems • Weather influenced by convection currents • Each hemisphere has 3 convection zones Polar Easterlies Prevailing Westerlies Trade Winds (northeast) *Hadley, Ferrel, & Polar Cells
