Abstract:
This paper aims to analyze strong convective weather process under the typhoon Vicente, Ramma-sun and Hato in Yunnan Province, through the conventional observation data, National Centers for Environmental Prediction (NCEP) 1° ×1° reanalysis data and Madden—Julian Oscillation (MJO). Results indicated that when the typhoon was about to come but had not yet entered key influence areas of Yunnan, the strong convective weather varied depending on the typhoon landing location, typhoon intensity, MJO phase, MJO strength, and the thermal conditions in early ground.In the westbound process of typhoon, when the MJO is in the 2—6 phases and behaves as strong MJO (in the cases of Rammasun and Hato), it will be beneficial to the formation of strong convection weather in Yunnan region.For the typhoon Hato, the MJO was in the 2 phase (dry window) and had an explosive enhancement, further combing with the high thermal condition in early ground, all the unstable conditions were more favorable to trigger the strong convective weather in Yunnan. Otherwise, when MJO was in the 4—6 phases (wet window), the precipitation would be more prominent in Yunnan.