Ch19_Lecture - Today's Epitome Roll Lab 5 returned...

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05/11/09 GEOL1401/tob 1 Today’s Epitome Roll Lab 5 returned Questions Take up Lab 6 Ch 18 review Describe air pressure, how it is measured, and how it changes with altitude. Explain how the pressure gradient force, Coriolis Effect, and friction influence wind. Describe the movements of air associated with the two types of pressure centers. Describe the idealized global patterns of pressure and wind. Discuss the general atmospheric circulation in the mid-latitudes. List the names and causes of the major local winds. Describe El Niño/La Niña and the global distribution of precipitation. Some lecture on Ch 19 Next time EXAM 1 Online
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05/11/09 GEOL1401/tob 2 G EOL1401 – Chapter 19 Weather Patterns and Severe Storms Dr. Thomas O. Bush Roberts 116 thomasbu@dbu.edu 214-333-5318
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05/11/09 GEOL1401/tob 3 Air Mass Characteristics  Large body of air 1600 km (1000 mi.) or more across Perhaps several kilometers thick Similar temperature at any given altitude Similar moisture at any given altitude Move and affect a large portion of a continent
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05/11/09 GEOL1401/tob 4 Air masses are classified on the  basis of their source region Figure 19.3
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05/11/09 GEOL1401/tob 5 Classification of an air mass By the latitude of the source region Polar (P) High latitudes Cold Tropical (T) Low latitudes Warm Continental (c) Form over land Likely to be dry Maritime (m) Form over water Humid air
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05/11/09 GEOL1401/tob 6 Classification of an Air Mass   By the characteristic of the source region Continental Maritime Four basic types of air masses Continental polar (cP) Continental tropical (cT) Maritime polar (mP) Maritime tropical (mT)
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05/11/09 GEOL1401/tob 7 Fronts  Boundary that separates air masses of different densities Air masses retain their identities Warmer, less dense air forced aloft Cooler, denser air acts as wedge
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05/11/09 GEOL1401/tob 8 Warm front
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05/11/09 GEOL1401/tob 9 Warm front Warm air replaces cooler air Shown on a map by a line with semicircles Small slope (1:200) Clouds become lower as the front nears Slow rate of advance Light-to-moderate precipitation
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05/11/09 GEOL1401/tob 10 Cold front
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05/11/09 GEOL1401/tob 11 Cold front Cold air replaces warm air Shown on a map by a line with triangles Twice as steep (1:100) as warm fronts Advances faster than a warm front Associated weather is more violent than a warm front Intensity of precipitation is greater Duration of precipitation is shorter Weather behind the front is dominated by Cold air mass Subsiding air Clearing conditions
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This note was uploaded on 04/15/2008 for the course GEOL 1401 taught by Professor Thomasbush during the Spring '08 term at Dallas Baptist.

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Ch19_Lecture - Today's Epitome Roll Lab 5 returned...

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