Table 2 - uploaded by Ajay Raghavendra
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Tropical cyclones are a diverse phenomenon coming in many shapes, sizes and strengths. Our research is aimed at analyzing the structure and evolution of tropical cyclones in the North Atlantic Ocean. Using the Extended Best Track (EBT) dataset we have documented the size, structure, and time evolution of the wind field associated with tropical cycl...
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... 2 to 78.5 Km 2 ; also three orders of magnitude difference. These results are also shown graphically in Figure 2. Table 2 lists the 5 largest and smallest tropical cyclones recorded in the data set. For this analysis, only the observation showing the maximum tropical storm force wind area during each storm's recorded existence was considered. ...
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Citations
This study presents an extension of the ground-based velocity track display (GBVTD)-simplex tropical cyclone (TC) circulation center-finding algorithm to further improve the accuracy and consistency of TC center estimates from single-Doppler radar data. The improved center-finding method determines a TC track that ensures spatial and temporal continuities of four primary characteristics: the radius of maximum wind, the maximum axisymmetric tangential wind, and the latitude and longitude of the TC circulation center. A statistical analysis improves the consistency of the TC centers over time and makes it possible to automate the GBVTD-simplex algorithm for tracking of landfalling TCs. The characteristics and performance of this objective statistical center-finding method are evaluated using datasets from Hurricane Danny (1997) and Bret (1999) over 5-h periods during which both storms were simultaneously observed by two coastal Weather Surveillance Radar-1988 Doppler (WSR-88D) units. Independent single-Doppler and dual-Doppler centers are determined and used to assess the absolute accuracy of the algorithm. Reductions of 50% and 10% in the average distance between independent center estimates are found for Danny and Bret, respectively, over the original GBVTD-simplex method. The average center uncertainties are estimated to be less than 2 km, yielding estimated errors of less than 5% in the retrieved radius of maximum wind and wavenumber-0 axisymmetric tangential wind, and;30% error in the wavenumber-1 asymmetric tangential wind. The objective statistical center-finding method can be run on a time scale comparable to that of a WSR-88D volume scan, thus making it a viable tool for both research and operational use.
