UIUC
ATMS 120 -
Feb_2_2016_Pressure_compass
School name
University of Illinois at Urbana, Champaign
Pages 6
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Pressure Definition equivalent to Typical values Avg Sea Level Pressure High Sfc pressure Low Sfc pressure Pressure Measurement Barometer Intended flying altitude actual path 8 km 300 mb 9 km 300 mb Barometer and surface pressure Low Surface Pressure 1000 mb High Surface Pressure 1000 mb Pressure Variations It s Why The Wind Blows Vertical Air pressure decreases rapidly with height ll Surface of the Earth Horizontal Air moves because of horizontal pressure differences Vertical Pressure Variations Key Point 30 70 Pressure mb 300 mb 500 mb 700 mb 850 mb 1000 mb Horizontal Pressure Variations Isobars lines of constant pressure on a wx map 4 mb increment Key relationship
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