Analysis of Continued Cloudy-rainy Weather during Wheat Harvest Season in the North

Based on precipitation data of 30 meteorological stations in the north wheat farming area from 1980 to 2004 from May to June, daily situation chart of 500hPa over Asia-Europe during the cloudy-rainy days and average geopotential height chart of 500hPa, the synoptic and climatically feature and the character of synoptic pattern of the continuous cloudy-rainy weather during the wheat harvest season in recent 25 years are analyzed. The relationship between the continuous cloudy-rainy process, the synoptic pattern and influencing system are studied. The result shows that block high with the cold vortex near the Baikal characterizes the synoptic pattern of continuous cloudy-rainy weather, in geostrophic wind filed of 500hPa, the wheat harvest area mainly locates in the boundary of south and north wind, during long cloudy-rainy days, south wind prevails in meridional wind field of 850hPa.

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