Analysis of Two Heavy Rainstorms in Southern Jiangsu
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Abstract:
On 10 June 2011 (for short, Process 1106) and on 10 June 2017 (Process 1706), there occurred two rainstorms in the south of Jiangsu Province. With the conventional observational and FNL reanalysis data and radar data, the two processes are analyzed. The results show that the anomalous high and low latitudinal circulation conditions provided a favorable circulation background for the occurrence of the heavy precipitation. There were great differences between the two processes in the physical quantity fields of the representative stations: the maximum divergence of Process 1706 was about twice as big as that of Process 1106; the maximum vertical velocity and maximum water vapor flux divergence of Process 1706 were about 1.8 and 1.3 times as big as that of Process 1106; and the large values were maintained for a long time. Both processes were characterized by strong tropical precipitation in the warm region; but the strong echo of 1106 was dispersing, the extensional height was low, the intensity was weak, and there was no obvious “train effect” of strong echoes. The strong echoes of Process 1706 arranged closely; the extension height was high, the intensity was obviously strong; and the “train effect” of strong echo was obvious. The change of helicity was generally ahead of that of precipitation, which was predictable and can be used as a predictor of the start, maintenance, and ending of largearea precipitation in shorttime forecasting (nowcasting). The change of the bottom height of the high wind zone in VWP (Vertical Wind Profiles) products was helpful to judge the changing trend of precipitation around the radar station.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.