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Trade Winds • Move east to west with tropical air • Doldrums • Warm trade winds meet, forcing air upwards, low pressure • Little to no wind, but lots of storms • ‘Dead water’ for sailors • Hard to sail across the Equator Prevailing Westerlies • Move west to east *Influences our weather in the US Horse Latitudes • Air forced downwards – creates areas of high pressure • Little rain, little wind, helps form deserts Polar Easterlies • Move east to west • Very cold air The Jet Stream • Fast moving band of wind in the upper atmosphere. • Found between the boundaries of the global wind systems, High and Low Pressure Areas • High pressure often associated with good weather • Low pressure often associated with bad weather High and Low Pressure Areas • High Pressure (Good Weather) • Air moves downwards, spins clockwise • Low Pressure (Bad Weather) • Air moves upwards, spins counter - clockwise Isobars Isobars – lines that show the same air pressure Lines can get close, but they don’t touch Lines close together = more wind Lines more spread out = less wind Winds in general move from H to L, but cycle appropriately
