policy statement A policy statement of the American Meteorological Society as adopted by the Executive Committee on 23 April 1993 1. Introduction evolve into tropical cyclones. In this sense, the hurri- cane is a rare phenomenon. Our ability to understand and deal effectively with The initiation of a vortex with winds of moderate hurricanes is tested yearly in the United States and strength (cyclogenesis) can occur very rapidly, often in worldwide. In 1992, three major hurricanes—Andrew, less than a day. The climatology of Atlantic tropical Iniki, and Omar—caused extensive damage to the cyclogenesis suggests that formation is favored when United States. As these hurricanes approached our a strong convective disturbance occurs in a region coastline, the importance and need for accurate fore- where the air is already "spinning" in a cyclonic (counter- casting of hurricane movement and intensity and for clockwise) direction. Other favorable factors, such as improved emergency preparedness planning and re- weak vertical wind shear, low-level inflow, and high- sponse was made clear to the nation. level outflow, have also been identified. Interactions Hurricanes (typhoons in the western North Pacific) between incipient disturbances and upper-tropospheric are a member of a class of systems referred to as systems
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Jul 1, 1993
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