【摘要】 利用松花江、嫩江流域内 94个气象台站的观测资料和 NCAR/NCEP再分析资料 ,分析了 1 998年夏季降水集中期和主要暴雨过程发生时的天气形势特点。之所以会连续出现暴雨、大暴雨 ,归纳起来有以下天气特点 :( 1 )亚洲中高纬度阻塞形势稳定 ;( 2 )长时间受东北冷涡控制 ;( 3)西太平洋副热带高压短时间北进 ,位置适中 ;( 4)盛夏北方季风较强盛。更多还原

【Abstract】 The weather circulation pattern of the summer tight precipitation period and the main heavy rain course in 1998 were analyzed with the NCAR/NCEP and daily precipitation data from 94 surface stations in Songhuajiang and Nenjiang area.The continuous rainfall can be contributed to the following weather patterns:(1)the steady blocking pattern in the middle and high latitude of Asia,(2) controlled by cold vortex long term,(3)advancing north ward of the subtropical high over the west Pacific and its suitable position,(4)the strong monsoon in midsummer.更多还原