Abstract
Abstract A climatological analysis, based upon operational surface and upper-air data from 1957 to 1994, of the wind and temperature profiles composited with respect to each quadrant of surface cyclones and anticyclones, is presented for the eastern two-thirds of the United States. The cyclones and anticyclones are located via an objective procedure. Hodographs and soundings are also composited with respect to season, geographic region, time of day, and, for cyclones only, intensity. Vertical profiles of the static-stability parameter are composited with respect to season and quadrant for both cyclones and anticyclones. The structures of mean cyclones and anticyclones are shown and discussed. A diurnal variation in hodographs (vertical shear) is found, which shows up in both cyclones and anticyclones as a rotation in the counterclockwise direction between 0000 and 1200 UTC above the boundary layer. The effect is greater in cyclones than in anticyclones. This variation is hypothesized to be in part due to ...
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