2024年6月大气环流和天气分析

Analysis of the June 2024 Atmospheric Circulation and Weather

2024年6月北半球极涡总体呈多极型,中高纬西风带环流为“四槽四脊”型分布,锋区位置总体偏北,低纬度地区西太平洋副热带高压强度明显偏强、位置偏西。6月全国平均气温较常年同期(20.4℃)偏高0.6℃,出现4次大范围高温天气,主要发生在西北、华北、黄淮等地。随着印度季风爆发以及6月17日长江中下游地区入梅,全国平均降水量较常年同期(102.8 mm)偏多11.9%,南方大部地区共发生5次强降水过程。累计降水量显著偏多地区主要位于江淮及其以南地区,部分地区降水量突破历史同期极值。

The main characteristics of the general circulation of atmosphere in June 2024 are as follows.There were four polar vortex centers in the Northern Hemisphere.The circulation of the mid-high latitude westerlies was distributed in the pattern of four upper-level troughs and four ridges of high pressure,and the position of frontal zone was generally by north.The western Pacific subtropical high was obviously stronger,located more westward than normal during this month.The monthly mean temperature of China was 0.6℃higher than the normal June temperature(20.4℃).During this month,four high temperature processes were experienced in Northwest China,North China and the Yellow River and Huaihe River regions.With the outbreak of the Indian monsoon and the middle and lower reaches of the Yangtze River into the Meiyu season on 17 June,the monthly average precipitation of China was more than the usual precipitation 102.8 mm by 11.9%.Totally,five regional torrential rain events occurred in most parts of southern China,especially in the south regions of the Yangtze River and Huaihe River where the accumulated precipitation was more excessive clearly.In addition,precipitation in some regions broke the record of extreme precipitation for the same period.