2013年7月大气环流和天气分析

Analysis of the July 2013 Atmospheric Circulation and Weather

2013年7月环流特征如下:欧亚中高纬呈西低东高异常分布型,我国中高纬多短波槽活动,西太平洋副高强度较常年偏强,西南季风较常年偏强。7月全国平均降水量138.9 mm,较常年同期(120.6 mm)偏多15.2%,为1951年以来第四多雨年;全国平均气温为22.4℃,较常年同期(21.9℃)偏高0.5℃。月内共出现11次强降水过程,多站出现极端日降水量。7月共有4个热带气旋在南海和西北太平洋活动,并有"温比亚"、"苏力"、"西马仑"等3个热带气旋登陆。江南、江淮、江汉及重庆等地出现持续高温天气,全国100个气象观测站发生极端高温事件。

The main characteristics of the general atmospheric circulation in July 2013 are as follows： the circulation presented an unusual pattern of higher pressure in the east and lower pressure in the west over Eurasia and the upper troughs were active. The northwestern Pacific subtropical high was stronger than normal. The monthly mean precipitation amount was 138.9 mm, which is 15.2% more than normal （120.6 mm）. The monthly mean temperature was 22.4℃, being 0.5℃ higher than normal. There were 11 heavy rainfall processes with extreme precipitation records observed at some stations. Four tropical cyclones appeared over the South China Sea and the northwestern Pacific Ocean with three of them landed on China. Long lasting high temperature weather occurred in south and southwest of China while extreme high temperature events happened at 100 meteorological observing stations.