关键词: 强对流, 天气型, 福建省

Abstract: Based on the meteorological data from 1991 to 2008 in Fujian province, the temporal and spatial distributions of severe convective weather and its formation reason as well as the dominantly synoptic patterns were analyzed. The results indicate that the monthly change of severe convective weather presents a typical bimodal pattern with the higher one from March to June and the other from July to August. A majority of severe convective weathers occur during 14:00 to 20:00 and life time is normally less than one day, and its influencing areas are often within two weather stations. The spatial distributions of severe convective weather in different seasons are different. The regional character of severe convective weather in spring is obvious.  For example, the most severe convective weather events occur in the inland mountain, the middle and north areas rather than in the coastal area and in the south areas. In comparison, the distributions are even in other seasons. Severe convective weather often occurs under severe shear weather situation and mainly happens in spring, autumn and winter. The rates of severe convective weather situations accompanying with low-level southwest jets are 66.5%, and the majority are types of moderate or slightly northward jet. The dominant synoptic situations are low trough and low-vortex shear or upper-level trough which influences areas covering more than three stations or ten stations. The severe convective weather of weak shear type often occurs during July to September, and the dominant synoptic patters are subtropical high edge type and typhoon periphery type. There are not southwest jets in low level, so a wide severe convective weather rarely happens.

Key words: Severe convective, Synoptic patterns, Fujian province