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    A Diagnosis of the Explosive Development of Two Extratropical Cyclones

    Smith, Phillip J.
    Zwack, Peter
    Lupo, Anthony R., 1966-
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    [PDF] DiagnosisExplosiveDevelopmentTwo.pdf (2.074Mb)
    Date
    1992-08
    Contributor
    University of Missouri-Columbia. College of Agriculture, Food and Natural Resources (CAFNR). School of Natural Resources. Department of Soil, Environmental and Atmospheric Sciences.
    Format
    Article
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    Abstract
    This paper examines the 24-h explosive development periods of two extratropical cyclones, the first occurring over the Gulf Stream off the coast of New England from 18 to 19 January 1979 and the second occurring over the southeastern United States from 20 to 21 January 1979. The data used in this study are the First GARP (Global Atmospheric Research Program) Global Experiment (FGGE) level IIIb (SOP I) global analyses on a 4° latitude × 5° longitude grid. The parameter used to diagnose development is the geostrophic relative vorticity tendency calculated using an extended form of the Zwack-Okossi development equation. This development equation is similar to the Petterssen-Sutcliffe development equation, but is shown to be more complete by explicitly coupling surface development with forcing at all levels above the surface. Cyclonic-vorticity advection, warm-air advection, and latent heat release act to develop the two cyclones, while adiabatic cooling in the ascending air opposes development. Further, vertical profiles of the development quantities for these two cases reveal that vorticity and temperature advection maximize in the 200-300-mb layer, while the latent heat release maximum is typically below 500 mb.
    URI
    http://hdl.handle.net/10355/2408
    Citation
    monthly Weather Review Volume 120, Issue 8 pp. 1490-1523
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    • Soil, Environmental and Atmospheric Sciences publications (MU)

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