Evaluation of an interactive regional wind analysis procedure for the tropics
Jeffries, Richard Allen.
Elsberry, Russell L.
Carr, Lester E., III
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An interactive tropical wind analysis technique is developed that combines the best features of the automated and subjective analyses over a limited region. An automated, large-scale analysis is used as a first-guess field. Composite observations over two 6-hour synoptic times and synthetic observations are added as increments to the first-guess field. Complete sets of synthetic observations are introduced to represent the upper- and lower-level structure of tropical cyclones, Tropical Upper Tropospheric Trough cells, upper-level anticyclonic cells, weak low- level cyclones, and point outflows from convective clusters. Point synthetic observations are inserted to represent satellite-observed features such as confluent asymptotes, or offset bad observations. A Multi-Quadric interpolation technique that draws closely to the wind observations effectively and efficiently provides an analysis on a 10 lat./long. grid. A sequence of 200 mb and 850 mb interactive analyses that includes Typhoon Robyn and Tropical Storm Steve is used to demonstrate changes from the first-guess and especially the vertical wind shear when synthetic observations are added.
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