Accession Number : ADA302690

Title :   Repetitive Tropical Cyclogenesis During TCM-93.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Kalafsky, Michael S.

PDF Url : ADA302690

Report Date : JUN 1995

Pagination or Media Count : 106

Abstract : The small Tropical Storm (TS) Ofelia developed in the wake of Typhoon (TY) Nathan, and just prior to the development of TY Percy, during a small field experiment called Tropical Cyclone Motion (TCM-93) that was conducted in the western North Pacific from 20 July 1993 to 12 August 1993. Two Aircraft Observing Periods, AOP-1A and AOP-1B, provided flight level winds and Omega Dropwinsonde (ODW) data in a region of north oriented confluent flow between the monsoon gyre and the subtropical ridge on the two days prior to the formation of TS Ofelia. The ODW data and the flight-level winds are used in a multiquadric interpolation technique to define the mesoscale structure on a 100 km grid. A mid-tropospheric mesoscale cyclonic circulation with a horizontal scale of about 400 km is documented during AOP-1lA and AOP-1B. The mesoscale cyclonic circulation extended between 700 mb and 400 mb during AOP-1A and then extended down to the surface in AOP-1B. Visible imagery on the day following AOP-1B indicates a vortex of tightly curved low level cumulus clouds that then developed deep convection that subsequently led to the formation of TS Ofelia. This is considered to be the best data set of the preexisting environmental structure in which a "midget" typhoon forms.

Descriptors :   *TYPHOONS, *CYCLOGENESIS, DATA BASES, WIND, THESES, MARINE ATMOSPHERES, INTERPOLATION, WAKE, HORIZONTAL ORIENTATION, CIRCULATION, NORTH PACIFIC OCEAN, CONVECTION(ATMOSPHERIC), SUBTROPICAL REGIONS.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE