TYPHOON FORMATION WITHIN THE ZONE OF THE INTERTROPICAL CONVERGENCE

Abstract

A case study of the early development of typhoon Marie (October 1966) revealed that this storm formed and intensified within the zone of the ITC. Satellite photographs, including infrared read-out during the night-time hours were obtained over the area of formation successively every 12 hr. with only one missing observation. 700- and 200-mb. streamline analyses are presented in relationship to these observations which include reconnaissance data obtained by the author as a pilot on flights into the storm. The development of Marie suggests a sequence of events which may be applicable to the development of other storms, particularly those occurring in early spring or the fall of the year. Four separate stages of development are shown covering the period prior to generation of vortical centers to that time when near typhoon intensity was attained.