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一、过程概况 2002年8月17日下午15时左右,成都地区出现了一次雷雨天气,其中双流机场雷暴持续了近6个小时,同时,在成都市的东北出现了冰雹,严重地威胁了双流机场进出港航班的安全。二、大气环流形势分析 1.500hPa西高东低的位势场 8月上旬以来副高一直维持在日本以东的海洋上,势力较弱,从8月11日起副高开始明显西伸,与此同时,贝加尔湖高压脊形成;12日副高西伸至南京—武汉—河内—线,长春经西宁至敦煌为一低压槽,西宁为580低涡;13日副高南侧有所减弱,西宁低涡的范围扩大,西宁—孟加拉弯为一低压槽,成都地区处在槽后的西北气流中;14日西宁低涡进一步加深,中心数值为576,低涡北部伴有
I. Process Overview At about 15:00 on August 17, 2002, a thunderstorm occurred in Chengdu. Among them, the thunderstorm in Shuangliu Airport lasted for nearly 6 hours. At the same time, hail occurred in the northeast of Chengdu and seriously threatened Shuangliu Airport flight safety in and out. Atmospheric Circulation Situation Analysis The geopotential height field of 1.500hPa West-East low has been maintained in the ocean to the east of Japan since early August. The subtropical high has been weak since August 11, At the same time, Baikal high ridge formation; on the 12th subtropical high stretch to Nanjing - Wuhan - Hanoi - line, Changchun from Xining to Dunhuang a trough of low pressure, Xining 580 low vortex; on the 13th south side of the subtropical high weakened, Xining low Xining - Bengal bend into a low-pressure trough, Chengdu area in the northwest after trough airflow; 14 Xining low vortex further deepened, the center value of 576, the north vortex is accompanied by