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UIUC
ATMS 120 -
Feb_2_2016_Pressure_compass
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University of Illinois at Urbana, Champaign
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PowerPoint PresentationSlide 2Slide 3Slide 4Slide 5Slide 6PressureDefinition: equivalent to…Typical values: Avg. Sea Level Pressure =High Sfc pressure = Low Sfc pressure =Pressure Measurement: BarometerIntended flying altitudeactual path9 km (300 mb)8 km (300 mb)Barometer and surface pressureLow Surface Pressure (<~1000 mb) =High Surface Pressure (>~1000 mb) =Pressure Variations: It’s Why The Wind BlowsVertical:Horizontal:Air moves because of horizontal pressure differences. llllAir pressure decreases rapidly with height Surface of the EarthVertical Pressure Variations1000 mb850 mb700 mb500 mb300 mbPressure (mb)Key Point:30%70%Horizontal Pressure VariationsIsobars = lines of constant pressure on a wx map (4 mb increment)Key
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