ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Trigger Role of the Lowlevel Jet for the Continuous Rainstorm in the Northwest Side of Subtropical High
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Abstract:
Using NCEP global 1°×1° finalanalysis data and the conventional highaltit ude and surface data，the formation mechanism of the continuous rainstorm in the northwest side of subtropical high is discussed. The results show that the he avy rain happened in the background of the exceptionally powerful subtropical h igh and the strong Typhoon “Hagupit” landing westward, and there is no lowva lue system impact on 500hPa during the course. The main trigger systems are the subtropical high and continued strong southeast wind of lowlevel jet out of the typhoon. Continuous southeast wind of lowlevel jet provides rainstorm area the continuous water vapor and instability energy. The largest rapid zonal convergence speed and terrain elevation for the formation of rainstorm provide a driving force for increasing convergence conditions. The heavy rain district is located in a stable branch of ascendant circulation. In addition, the cold air in the proc ess played an important role.
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