AbstractThe principal rainband in tropical cyclones is currently depicted as a solitary and continuous precipitation region. However, the airborne radar observations of the principal rainband in Typhoon Hagupit (2008) reveal multiple sub-rainband structures. These sub-bands possess many characteristics of the squall lines with trailing stratiform in the middle latitudes and are different from those documented in previous principal rainband studies. The updraft and reflectivity cores are upright and elevated. The updraft is fed by a lowlevel radial outflow from the inner side. The tangential wind speed shows a clear mid-level jet on the inner side of the reflectivity core. Except for the structural similarities, the dynamics of the sub-bands is also similar to the squall lines. The local environment near the sub-bands shows little convective inhibition, modest instability and vertical wind shear. The temperature retrieval shows a cold pool structure in the stratiform precipitation region. The estimated vertical wind shear induced by the cold pool is close to that of the local environment. The structural and dynamic similarities to the squall lines implies that the variation of principal rainband is subjected to convective-scale dynamics related to the local environment in addition to storm-scale dynamics. The sub-bands show positive impacts to the vortex intensity in terms of potential vorticity redistribution and absolute angular momentum advection. The positive impacts are closely related to specific structural characteristics of the sub-bands which suggests the importance of understanding the convectivescale structure and dynamics of the principal rainband.
Monthly Weather Review – American Meteorological Society
Published: Nov 28, 2017
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