| Abstract: | Based on the conventional data ,hourly regional automatic station observation data, and NCEP 1°× 1°reanalyzes data every 6 hours during the heavy rain occurred in Anshun City, Guizhou Province on June 5-11 and September 5-10, 2019.The results show that:(1)The weather process was mainly caused by the continuous eastward movement of short wave trough between the two highs, resulting in the generation from June 5-11,and the weather was mainly caused by the stable and less movement of the subtropical high, the stable maintenance of the southwest vortex around the subtropical high from September 5-10.(2)The larger the vertical integral of vertical helicity, the more favorable it is to produce strong short-term heavy rainfall,and the higher the development height of the strong center of vertical helicity, the more conducive to the continuous generation of short-term heavy rainfall.(3)The moisture vertical helicity has a good indication of the occurrence and intensity of short-term heavy precipitation in the two continuous rainstorm weather processes.The moisture vertical helicity increases 6 hours before the occurrence of short-term heavy precipitation, and the larger the value, the stronger the short-term heavy precipitation, and the moisture vertical helicity decreases rapidly during the occurrence of short-term heavy precipitation.(4)During the weather process from June 5 to 11, the more the mass vertical helicity increases and decreases, the stronger the short-term heavy rainfall intensity. |
