Observations of Tropical Cyclone Low-level Wind Maxima

Ian M. Giammanco, John Schroeder, Mark D. Powell, Douglas Smith

Research output: Contribution to conferencePaperpeer-review

Abstract

Mean wind profiles computed from Global Positioning System (GPS) dropsonde data[1] have exhibited a wind speed maximum located near 500 m above ground level (agl); however the wind profile observed by individual GPS dropsonde profiles is highly variable [2][3][4][5]. A group of 1131 GPS sondes were analyzed from the Atlantic and Eastern Pacific basins from 1997-2005 with an emphasis placed on evaluating the characteristics of low-level wind maxima below 200 m agl. Approximately 10% exhibited a maximum wind speed below 200 m agl, with nearly 40% containing the maximum below 500 m agl. A radial and storm relative dependence in the height of the wind speed maximum was also noted. The log-wind profile performed well when compared to mean composite wind profiles for sonde grouped by wind speed bin. In an effort to identify features observed by GPS dropwindsondes, Doppler Weather Surveillance Radar 1988 (WSR-88D)data were used to derive vertical wind profiles using the Velocity Azimuth Disp
Original languageEnglish
StatePublished - Jun 2009

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