Patterns of Extreme Precipitation and Characteristics of Related Systems in the Northern Xinjiang Region

Based on 40 years of daily precipitation, 272 extreme precipitation days in the Northern Xinjiang region are defined. Using data these days, four spatial patterns were obtained through principal component analysis. Then, daily-averaged reanalysis used to analyze variations synoptic systems and two before after. The rainfall centers shifted with influential at 500 hPa. Water vapor western Tianshan type (Type WT) north NN) comes from west, while Central CT) mainly east. In east EN), water converges both sides. upper-level jets located west 80° E Type WT CT. However, they other types. This article summarizes hPa, South Asia High, westerly jet, transport between surface hPa types patterns, builds conceptual model for each type. models built can be applied heavy forecast Xinjiang.