On the role of ?hot towers? in tropical cyclone formation (original) (raw)

1998, Meteorology and Atmospheric Physics

ON TROPICAL CYCLONES Topic 2 . 1 : Tropical-Cyclone Formation : Theory and Idealized modelling

2010

This report summarizes work completed since IWTC-VI that contributes to an improved understanding of tropical-cyclone formation and a p otentially useful perspective for forecasters and researchers. The topic of tropical cyclone formatio n has been the subject of considerable active research in the past four years. Much of the recent research reviewed here points to a unified view of the genesis and intensification process. It provide s also a basis for some new tools to aid in forecas ting tropical-cyclone formation.

Observational analysis of tropical cyclone formation

1979

This study investigates the genesis of tropical cyclones through a combination of the compositing approach and the case study approach. Twelve composite data sets are analyzed from the tropical Northwest Pacific and tropical Northwest Atlantic Oceans. Each data set is a composite average of approximately 80 individual disturbances. Four different types of non-developing oceanic tropical disturbances are composited. They are compared with pre-hurricane and pre-typhoon disturbances in each ocean composited at four different stages of intensification. In total 912 different tropical weather systems go into the composites and approximately 40,000 rawinsonde observations are used. The main findings from the analysis of the composite fields are: (i) pre-typhoon and pre-hurricane systems are located in large areas of high values of low level relative vorticity. The low level vorticity in the vicinity of a developing cloud cluster is approximately twice as large as that observed with non-de...

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