Abstract:

In order to understand the climatic characteristics of thunderstorm in Linfen City, the thunder and lightning protection and disaster reduction to provide scientific basis for prediction. The author utilized the thunderstorm observation data from the ground meteorological observatory in Linfen nearly 57 years from 1954 to 2011, statistically analyzed the thunderstorm climate characteristic of Linfen City by mathematical statistics, linear fitting, climate trend rate method and M-K- mutations inspection, wavelet analysis and so on. The results showed that annual average days of the thunderstorm was 26.2 days, the year appearing thunderstorm most happened in 1959, while the year appearing least happened in 2009, the thunderstorm months in Linfen City presented a parabolic unimodal change, its peak value happened in July, the average day of beginning thunderstorm on April 29, while average for ending thunderstorm on September 25 in Linfen, the average duration of thunderstorms lasted 148 days, In most cases thunderstorm happened at the same time with precipitation appear, wet thunderstorm accounted for 79% of the total number. It was concluded that the number of thunderstorm had a decreasing trend, there was an obvious seasonal thunderstorm, summer most, winter no thunderstorms, the thunderstorm days happened these years had a wavy change.The thunderstorm months in linfen city present a parabolic unimodal change,its peak value happened in July, the next happened in August.Except January and February,there have thunderstorms from March to November . The most mouths of thunderstorms days occured in July 1974, which lasts for 16 days; The average day of beginning thunderstorm on April 29, while average for ending thunderstorm on September 25 in linfen. The thunderstorm days happened these years have an wavy change, the average duration of thunderstorms lasts 148 days;the position of producing and settleing thunderstorm happened in NW direction most. In most cases thunderstorm happende at the same time with precipitation appear, wet thunderstorm has a percent of 79 of the total number.