15 Mid-Latitude Cyclones

15 Mid-Latitude Cyclones - Middle-latitude cyclones GEOG...

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Middle-latitude cyclones GEOG 345 October 26 2006 Textbook: chapter 12
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Middle-latitude cyclones synoptic scale eddies first described by a Norwegian group of meteorologists (Bjerknes, Solberg, Bergeron) based on the polar front theory Fig. 12-CO, p. 308
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Fig. 12-1, p. 311 Polar front theory a. polar front separates the cold polar air and the warm subtropical air b. cyclonic wind shear leads to a frontal wave c. open wave develops d. warm sector narrows as the cold front catches up with the warm front e. occlusion f. old cyclone dissipates; now cut off cyclone (secondary low) may form
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Front occlusion cold type warm type also chronosequence
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Fig. 12-2, p. 312 Family of cyclones frontal wave open wave advanced occlusion
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Fig. 12-3, p. 312 Family of cyclones advanced occlusion fontal wave stationary front
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Fig. 12-4, p. 313 Cyclogenesis: lee-side lows Lee cyclogenesis often occurs on the leeward side of Sierra Nevada and the Rockies.
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Fig. 12-5, p. 313 Typical paths of winter cyclones and anticyclones cyclogenesis often occurs in areas where there is a contrast between surface conditions
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Fig. 1, p. 314 Nor’easters Nor’easters are characterized by strong winds and large amounts of precipitation. In some ways Nor’easters resemble tropical storms.
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Fig. 12-6, p. 315 Vertical structure of cyclones and anticyclones: simple model systems would rapidly dissipate “piling up of air” “removal of air”
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Fig. 9-21, p. 237 Thermal highs and thermal lows A thermal high at the surface is a thermal low aloft.
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  • Fall '06
  • Csiszar
  • Precipitation, Tropical cyclone, Cyclone, Extratropical cyclone, Atmospheric dynamics, (planetary vorticity)

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