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16 - Pressure gradient change of atmospheric pressure...

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Local Wind Patterns Wind is defined as air moving horizontally over the Earth’s surface. Winds are identified by the direction from which the wind comes – a west wind blows from west to east. Pressure Gradients Wind is caused by differences in atmospheric pressure from one place to another Air tends to move from regions of high pressure to regions of low pressure Isobars: lines on a map drawn through all points having the same atmospheric pressure
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Unformatted text preview: Pressure gradient: change of atmospheric pressure measured along a line at right angles to the isobars Variations in Atmospheric Pressure Cells of High and Low Pressure Low (Cyclone) = L Air is ascending (rising) Low pressure Convergence at surface High (anticyclone) = H Air is descending (subsidence) High pressure Divergence at surface...
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