The circulation background and its pattern evolution of 100hPa and 500hPa in October 2000 are analyzed from the angle of extended forecast.

The consecutive heavy fog occurred in most areas of Hebei Province from December 31,2006 to January 5,2007,was analyzed based on upper and low level circulation patterns,physical quantities and meteorological element fields,etc.

By analyzing the circulation at 500 hPa,four kinds of favorable circulation patterns are found:two troughs and one ridge,zonal circulation pattern,continental warm high,and subtropical high.

The circumfluence situations of rainstorm were divided.

A statistic is made on cold wave weathers in the recent 46 years according to the revised standard for cold wave, and analyzes the circumfluence situation of typical cold wave years.

They had a similar circulation situations,which had a strong convergence field in the lower and a divergence field in the upper,and physical field,such as distribution of vapor and instability,by comparing two heavy rainfalls.

The typical large-scale high temperature processes ,climatic characteristics,main influential systems and circulation situation are discussed by using the temperature data of 89 meteorological stations in the period of 1961 to 2004 over Guangxi.

This paper analyzed the following contents of this weather:circulation situation,numerical forecast product,physical quantity field,vapour flux and its divergence,vertical velocity,and divergence variety et al.