ANALYSIS OF THE CHARACTERISTICS AND CAUSES OF AN AUTUMN TYPHOON RAINSTORM IN HAINAN
LI Hui-qin
LI Jiang-nan
YU Yan
YANG Jin-chao
SONG Yun-tao
FENG Ye-rong
Abstract：ECMWF reanalysis,precipitation data of TRMM3B42 and TBB data of FY2E satellite are used to synthetically analyze the characteristics and causes of an autumn typhoon "Haiyan" caused heavy rain in Hainan.The results showed that:(1)The mesoscale cloud cluster in the typhoon is the direct affecting system which causes heavy rain in Hainan;the terrain lifting effect and the invasion of weak cold air increased the intensity of torrential rain in Hainan,the maximum precipitation of the rainstorm process occurred in the windward slope of Five Fingers Mountain;(2)The convergence of south and southeast airflows and the presence of a low-level jet are favorableto trigger and sustain heavy rain;(3) The heavy rain events occurred in the very stiff and dense section of the concentrated region,which can lead to the development of slantwise vorticity;The center of rainstorm has a very good correspondence with MPV1 and MPV2,the rainstorm will probably happen when MPV 1 ＜0 and MPV 2＞0 in the low troposphere;(4) The positive area of the helicity at 850hPa will be indicative in forecasting where the 6 h heavy precipitation will fall.
Keywords：rainstormHainanmoisture potential vorticityvertical helicity
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 133-144 )