The Observations of the Huanghai Sea, Bohai Sea and the Sea of Japan Highs and the Heavy Rain in North China in Summer.

This article makes use of day by day 500hPa circulation charts for summers June-August 1966-1987. It takes high pressure processes occurring in the range 30-50 deg N, 110-140 deg E and divides them into five types in accordance with their formation properties, that is, the five types of high pressure processes--westerly high pressure, plateau high pressure, subtropical high pressure, combinations of westerly high pressure and subtropical high pressure, as well as combinations of plateau high pressure and subtropical high pressure. It analyzes time periods associated with the five types of high pressure processes described above as well as the geographical distribution of climatic characteristics. In conjunction with this, it points out that, in the North China region in the height of summer July and August--in particular, in the eastern sections of the North China area and the southern Manchuria region--there is an extremely close relationship existing between rainstorm and heavy rainstorm weather processes which appear and these stable high pressure configurations. AN