Development of a rapidly deepening extratropical cyclone over land. Part II: Thermodynamic aspects and the role of frontogenesis

The unusual case of a rapidly developing land cyclone that occurred on 15-17 November 1989 over the United States and Canada is investigated to determine the physical mechanisms responsible for its development. Hourly surface and 12-h upper-air data are analyzed for this storm for the 36-h period be...

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Veröffentlicht in:Monthly weather review 1996, Vol.124 (8), p.1633-1647
Hauptverfasser: RUSCHER, P. H, CONDO, T. P
Format: Artikel
Sprache:eng
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Zusammenfassung:The unusual case of a rapidly developing land cyclone that occurred on 15-17 November 1989 over the United States and Canada is investigated to determine the physical mechanisms responsible for its development. Hourly surface and 12-h upper-air data are analyzed for this storm for the 36-h period beginning on 0000 UTC 15 November. Findings reveal that surface-based frontogenetic forcing and the diabatic effects of latent heating were primarily responsible for the initial development of the system. Proper positioning of the surface low with respect to a 500-mb short-wave trough and 250-mb jet streak yields the greatest deepening of 13 mb in 12 h at a later time. It is suggested that frontogenetic mechanisms contribute to development of this system prior to any favorable organization of the large-scale upper-tropospheric dynamic forcing.
ISSN:0027-0644
1520-0493
DOI:10.1175/1520-0493(1996)124<1633:DOARDE>2.0.CO;2