![]() ![]() It is found that the vertical wind shear is a dominant factor for the rainfall asymmetry when shear is >5 m s −1. The analysis is further extended to examine the storm motion and the vertical wind shear and their collective effects on TC rainfall asymmetries. As TC intensity increases, the asymmetry maximum shifts upwind to the left. Large asymmetries are usually observed away from the TC centers. The rainfall asymmetry maximum is predominantly downshear left for shear values > 7.5 m s −1. The rainfall asymmetry decreases (increases) with storm intensity (shear strength). The wavenumber-1 maximum rainfall asymmetry is downshear left (right) in the Northern (Southern) Hemisphere. ![]() The environmental vertical wind shear is defined as the difference between the mean wind vectors of the 200- and 850-hPa levels over an outer region extending from the radius of 200–800 km around the storm center. This study uses a similar approach to investigate the relationship between the structure of TC rainfall and the environmental flow by computing the rainfall asymmetry relative to the vertical wind shear. The mean TC rainfall distribution and the wavenumber-1 asymmetry vary with storm intensity and geographical location among the six oceanic basins. ![]() Global TC rainfall structure, in terms of azimuthal distribution and asymmetries relative to storm motion, has been previously described using the Tropical Rainfall Measuring Mission Microwave Imager rainfall estimates. Vertical wind shear and storm motion are two of the most important factors contributing to rainfall asymmetries in tropical cyclones (TCs). ![]()
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