We thank Arlene Laing and John Tuttle for reviews of the draft manuscript and comments. The station data and Doppler radar data were provided by the National Meteorological Center, China Meteorological Administration. This research was supported by the National Natural Science Foundation of China under Grants 41075032 and 40930951, the China Meteorological Administration under Grant GYHY200906004, and the National Key Basic Research and Development Project of China under Grant 2012CB417201.
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