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Luo Y.,Shanghai Jinshan Meteorological Bureau | Zhang J.,Shanghai Jinshan Meteorological Bureau
Journal of Soochow University Engineering Science Edition | Year: 2011

In this paper, the 5-day average critical air temperature on the first and last thunderstorm days is computed based on observations of the first and the last thunderstorm days in Jinshan from 1959 to 2008. The Results indicate that: the mean annual number of thunderstorm days is comparatively large, and intramural thunderstorm variability is great, the annual number of thunderstorm days has a decreasing trend, the average tendency rate is 1.2 days per 10 years. The obvious seasonal variation of thunderstorm can also be detected, and the period of March to October is the most frequent months for thunderstorm, and over 70% thunderstorm occurs in the four month of June, July, August and September. The initial thunderstorm is often occurring around the middle ten days of March, the ending date of thunderstorm is carnally around October, and the thunderstorm period varies with the geographic regions. The critical temperature of initial thunderstorm days is defined: the 5-day average air temperature rises to 6°C steadily and end drop to 18°C steadily. In addition, thunderstorms in Jinshan have significant syntonic scales of 1~2a, qausi-3a and qausi-6a. Source

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