云浮地区灾害性大风的特征

Characteristics of Destructive High Winds in Yunfu Area

利用云浮地区16个气象站2008—2016年的大风资料,从大风的发生时间、时段、风向和风力等方面分析大风的空间和时间分布规律及特征,结果表明:(1)大风分布与地形有一定关系,罗定大风最多,郁南最少。(2)大风日变化非常明显,白天出现大风的机率远远大于夜间,下午明显大于上午;大风日数的月和季节分布变化特征也非常明显,汛期4—9月是高发期。(3)强对流天气引起的大风占比最大,其次是热带气旋影响,而冷空气引起的占比极少。

The data of high winds from 16 meteorological stations of Yunfu area from 2008 to 2016 are used to study,from the viewpoints of onset time and duration,wind direction and force,the patterns and characteristics of spatiotemporal distribution of high winds. The result is shown as follows.（1） The distribution of high winds was somewhat related to terrain,so that they appeared the most in Luoding but the least in Yv＇nan.（2） The diurnal variation of high winds was quite significant with the probability much larger in the daytime and morning than at night and afternoon. Besides,the monthly and seasonal distributions of days with high winds were also remarkable,having the highest frequency from April to September,the flood season.（3） The high winds caused by intense convection took up most of the total,followed by that by tropical cyclones,and then by cold air,the least.