Theweather systems and a relatedmesoscal convective systems, causing severe heavy rain in the south-eastGansu Province during 27-28 Aug 2006, are successfully simulatedwithMM5 models. Trumpet-shaped topography prominently increased rainfall in Gangu county. The rise of the terrain enhanced the low level convergence and verticalmovementover thewindward side of the terrain.The dynamical enforced rise of the terrain emerged at the prophase and the time of the rainfal.l
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The main functions of Surfer software，ActiveX automation technique and the interface of VB application and Surfer are introduced in this paper．It is also introduced how to combine the strong ability of development using VB software and the strong mapping in  Surfer based on the interface．and the key program to Ca／Ty out the interface technique and a case of application automatic mapping are presented．

The large range rare fog process which occurred in East China from November 30 to December 4 in 2004 was analyzed, including the circulation background, its adjustment and evolvement, the climatic background, the atmospheric stratification condition and the vapor condition near surface, etc. Results show that the warm advection at the low level, the stable atmospheric stratification and the abundant vapor condition resulted in this rare fog process, and fog dissipation needs the cold air invasion with the cold front.