Chapter12b - Middle-Latitude Cyclones II Review and Outline...

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Middle-Latitude Cyclones - II
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Review and Outline The polar front model (Norwegian model) of a developing mid-latitude cyclonic storm represents a simplified but useful model of how an ideal storm progresses through the stages of birth, maturity and dissipation. Cyclogenesis, lee-side lows, northeasters, bombs. For a surface mid-latitude cyclonic storm to form, there must bean area of upper-level divergence above the surfacelow. For the surface storm to intensify, this region of upper level divergencemust be greater than surfaceconvergence. When the polar-front jet stream develops into a looping wave, it provides an area of upper- level divergencefor the development of surface mid-latitude cyclonic storms. The curving natureof the polar-front jet stream tends to direct surface mid-latitude cyclonic storms northeastward and surface anticyclones southeastward. Skip thesections on “Vorticity, Divergence, and Developing Mid-Latitude Cyclones” and “Polar Lows”
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The life of a mid-latitude (wave) cyclone
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Satellite image from Chapter 1: Fig. 1.13.
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