CU-Boulder ATOC 1050 - ATOCch10 (21 pages)

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ATOCch10



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ATOCch10

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Pages:
21
School:
University of Colorado at Boulder
Course:
Atoc 1050 - Weather and the Atmosphere
Weather and the Atmosphere Documents

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1 CHAPTER 10 EXTRATROPICAL CYCLONES FORMING EAST OF THE ROCKY MTS Where will a low pressure system center form at the surface relative to an upper air trough and ridge On the EAST side of the trough under the LEFT EXIT region of the jetstreak Consider a situation in which upper level divergence exceeds low level convergence There is a surface low that is weakening Left entrance region Convergence Sinking motion Increasing surface pressure Right entrance region Divergence Rising motion Decreasing surface pressure Left exit region Divergence Rising motion Decreasing surface pressure Right exit region Convergence Sinking motion Increasing surface pressure 2 Moveme nt from trough to ridge Air speeds up Diverge nce Rising motion Decreasi ng surface pressure Moveme nt from ridge to trough Air slows down Converg ence Sinking motion Increasin g surface pressure Both curvature and jetstreak influence flow Effects of Heating and development of highs and Diabatic processes and cooling usually dude 1 Conduction surface 2 Convection rising 3 Radiation 4 Latent heat release cooling on lows involve heating to solar heating contact with plumes 3 Warming of the atmosphere will lead to the formation of low pressure at the surface Cooling of the surface will lead to the formation of high pressure at the surface Low pressure centers over the ocean tend to be stronger then low pressure centers over continents More evaporation occurs over the oceans then over land leading to more latent heating in the could and a reduction in surface pressure Friction is reduced over water so frictional dissipation of the low occurs at a slower rate If an air column is heated through latent heat release how will the surface pressure change The surface pressure will LOWER when an air column is heated When air pressure is rising due to a surface low pressure system any latent heat release will INTENSIFY the surface low SUMMARY 1 Divergence Convergence wind speed and direction in upper level flow 2 Cyclonic



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