Analysis of Two Typhoons Landing on Western Guangdong

TC precipitation prediction based on corresponding track-similar TC precipitation is one of operational TC precipitation forecasting methods.Typhoon Imbudo (0307),Krovanh (0312) and a Tropical Depression have similar tracks and both brought about heavy rainfall in Shenzhen,but their precipitation intensity have different features.The analysis shows that when typhoon Imbudo moved westward to the Jiangnan area, the Huanan area and the South China Sea were gradually controlled by the subtropical anticyclone. In this process the subtropical anticyclone becomes stronger and extends west. The easterly jet stream subsides, and the θ_se value is low. These factors are unsuitable to the development of Imbudo's precipitation cloud system.However, the South China Sea is controlled by a convergence zone before Typhoon Krovanh enters the area. In Krovanh's westward process, the subtropical anticyclone subsides, and the easterly jet stream becomes stronger. These factors are conducive to the development of the spiral band on the right front side of Krovanh. This is the reason that Krovanh brings more rainfall to Shenzhen than Imbudo though it is farther than the latter from the city.

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