In this paper, the synoptic process of convective heavy rain in Pingxiang and heavy rain in some areas from July 9 to 10, 2020 is analyzed by using high-altitude weather maps, automatic regional station data, sounding...In this paper, the synoptic process of convective heavy rain in Pingxiang and heavy rain in some areas from July 9 to 10, 2020 is analyzed by using high-altitude weather maps, automatic regional station data, sounding data maps and satellite cloud pictures. The results show that (1) The high pressure in the upper atmosphere is maintained, the circulation situation of "two troughs and one ridge" in the middle and high latitudes is stable, the large trough in East Asia is stable and less moving, and the low trough in Lake Baikal is deepening southward to guide cold air southward;The subtropical high at low latitudes strengthened westward and remained stable with little movement. The warm and humid air flow at the northwest side provided continuous water vapor transportation for Pingxiang. The strong convergence of the southward dry and cold air and the southward warm and humid air, combined with the favorable conditions of convergence in the lower level and divergence in the upper level, constituted the basic circulation situation of the rainstorm. (2) The warm and humid air flow in the middle and low levels transports a large amount of unstable energy and abundant water vapor, and the convergence line on the ground triggers the release of unstable energy, which, in combination with the uplift of the shear system in the lower level, results in obvious convective precipitation in Pingxiang. (3) Convective monomer is continuously generated and developed near the shear line, and moves and merges along the system direction. The region matching degree between the highlight area and the short-term strong precipitation on the cloud image is very high. The highlight area and the system development direction have good reference function for the short-term and imminent forecast of the precipitation process that is occurring.展开更多
文摘In this paper, the synoptic process of convective heavy rain in Pingxiang and heavy rain in some areas from July 9 to 10, 2020 is analyzed by using high-altitude weather maps, automatic regional station data, sounding data maps and satellite cloud pictures. The results show that (1) The high pressure in the upper atmosphere is maintained, the circulation situation of "two troughs and one ridge" in the middle and high latitudes is stable, the large trough in East Asia is stable and less moving, and the low trough in Lake Baikal is deepening southward to guide cold air southward;The subtropical high at low latitudes strengthened westward and remained stable with little movement. The warm and humid air flow at the northwest side provided continuous water vapor transportation for Pingxiang. The strong convergence of the southward dry and cold air and the southward warm and humid air, combined with the favorable conditions of convergence in the lower level and divergence in the upper level, constituted the basic circulation situation of the rainstorm. (2) The warm and humid air flow in the middle and low levels transports a large amount of unstable energy and abundant water vapor, and the convergence line on the ground triggers the release of unstable energy, which, in combination with the uplift of the shear system in the lower level, results in obvious convective precipitation in Pingxiang. (3) Convective monomer is continuously generated and developed near the shear line, and moves and merges along the system direction. The region matching degree between the highlight area and the short-term strong precipitation on the cloud image is very high. The highlight area and the system development direction have good reference function for the short-term and imminent forecast of the precipitation process that is occurring.
