551 frontogenesis. three main frontogenetical areas in a typical developing cyclone deformation...
TRANSCRIPT
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551 Frontogenesis
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Three main frontogenetical areas in a typical developing cyclone
• Deformation frontogenesis with cold front• Deformation (confluence)frontogenesis with
warm front• Convergence frontogenesis near low center
(generally on portion of warm front closest to the low center)
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Using Garp software
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Numerical Simulation of the Dec. 14-16, 1987 event
• Mass and Shultz, 1993• Shultz and Mass, 1993• Monthly Weather Review
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Note fracture in frontogenesis along northern portion of CF
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Important issue we will discuss
in depth:Frontogenesis
generally accompanies cyclogenesis
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Surface-based fronts typically weaken with height
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How do we explain this?
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Classic Paper That First Applied Frontogenesis Diagnosis 3D for a
real case: Sanders 1955
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Surface-basedFronts Weakening With Height
• Rising motion and adiabatic cooling on warm side.
• Sinking and adiabatic warming on on cold side.
• Vertical motions increase with height…therefore vertical motions increasingly work against frontogenesis with height.