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DO NOW: Force that is exerted by air, it presses down on Earth’s surface •Measured with a Barometer • Higher elevation = less pressure • Bc molecules are farther apart….. Because of denisty Highs are regions of cold, heavy air (high air pressure) Lows are regions of warm, light air (low air pressure) •“Highs” •Center of air masses •Clear skies, dry weather, gentle winds •Air currents will move out •Winds blow clockwise in northern hemisphere •“Lows” •Edges of air masses •Cloudy, wet, strong, gusty wind •Air currents will move in •Winds blow counterclockwise in northern hemisphere When air moves from HIGH pressure to LOW pressure, winds are created •Horizontal movement of air •Cool, dense air moves toward warm, less dense air •Direction from which air is COMING FROM •Wind vane = points in the direction wind is coming from Wind •How fast air is moving Speed •Wind speed increases when difference in air pressure is high •Up & Down movements of Air air Current WARM COOL Global •Large system of winds around Earth Winds •Caused by changes in air pressure Equator = warm air rises & moves toward poles (low) Poles = cool air sinks & moves toward equator (high) •Curve as they move from high low regions bc of Earths rotation Coriolis •Due to Earth’s Rotation •Northern Hem = winds & Effect ocean currents curve RIGHT •Southern Hem = winds & ocean currents curve to LEFT In the Northern Hemisphere what a sight. A moving object drifts to the right. If all this seems a bit too much to rehearse, Remember, the Southern Hemisphere does it all in reverse. Prevailing •Blow in same direction at a latitude Winds •Westerlies = blow from the west in the middle latitude •Trade winds = blow from the east, in the tropics. Jet Streams •Global winds •Belts of high speed air in upper atmosphere •West East Sea breeze •Breeze from sea land •Cooler & heavier •Pushes warmer & lighter air above land UP •Breeze from land sea Land •At night, land cools faster breeze than water air becomes cooler & heavier •Moves to water & pushes warmer, lighter air UP