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551 Frontogenesis

551 Frontogenesis. 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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551 Frontogenesis

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  1. 551 Frontogenesis

  2. 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)

  3. Using Garp software

  4. Numerical Simulation of the Dec. 14-16, 1987 event • Mass and Shultz, 1993 • Shultz and Mass, 1993 • Monthly Weather Review

  5. Note fracture in frontogenesis along northern portion of CF

  6. Important issue we will discuss in depth:Frontogenesis generally accompanies cyclogenesis

  7. Surface-based fronts typically weaken with height

  8. How do we explain this?

  9. Classic Paper That First Applied Frontogenesis Diagnosis 3D for a real case: Sanders 1955

  10. 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.

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