Variation Characteristics of Gale in Tuokexun County

Using the data of gale in Tuokexun County from 1971 to 2009,the variation characteristics of gale were analyzed,the results showed that the gale's times decrease obviously in recently 39 years,and the gale happened mainly from Mar.to Nov.,the prevailing wind direction is west to northwest,the frequency of which is 44%,and the secondary wind direction is east to southeast with frequency of 18%.Gale often starts after 14 o'clock,most frequently at 18 o'clock and happened 355 times from 16 to 19 o'clock,which is 58.6% of the total times of gale.