Climatic Features of Thunderstorms in Altai Region
Using thunderstorm weather observational data from 1969 to 2008 in the Altai region that including seven meteorological stations,Jimunai,Habahe,Buerjin,Aletaishi,Fuhai,Fuyun and Qinghe meteorological station,we analyzed the spatial-temporal characteristics of thunderstorms in the area.The results showed that annually average occurrence of thunderstorms were from 12 to 24 days.The thunderstorm days were more in the western than eastern,more in the northern than southern,and more in alpines than plains.The thunderstorm mostly appeared from May to August.The intra-annual variation of thunderstorm days took on single-peak type,and July was of the high value period generally.The tendency of thunderstorm occurrence change was linearly reducing type.Wavelet analysis revealed the period of 16 years.Lightning disaster had been increasing with social and economic developments.