Using the conventional and unconventional meteorological observation data, flow pattern configuration, the physical diagnosis of the satellite and radar data for the heavy snowstorm process occurred in Shanxi region from 9 to 12 November 2009 were comprehensively analyzed. The results showed that the durative heavy snowstorm weather process presented against backgrounds of two kinds of circulation, which influenced by 3 middle-α scale snowstorm cloud systems during the heavy snowstorm, the occurring, developing and moving of the heavy snowstorm cloud system were closely linked with 700 hPa shear line and jet flow in low altitude. The analysis results indicate that the three jet flows from northeast, southwest and westwards below 400 hPa were strong and prosperous, and turn around with altitude, which is the main characteristic of the rare heavy snowstorm process flow pattern configuration. The atmosphere stratification below 200 hPa was in instable status and wet layer thickness reaches 200 hPa, the vertical distribution of divergence presented obvious symmetrical structure of convergence in lower level and divergence in upper level, the water vapor convergence quantity below 400 hPa was a fold increase in the period of heavy snowstorm. This kind of configuration of the physical quantity field accelerated the convergence of wet air in lower level and their raising upwards movement, and which provides the advantageous condition for the occurring of snowstorm and heavy snowstorm. The snowfall is positive proportion to the divergence field, the high-low divergence and convergence intensity of vapor flux field, and the wet layer thickness against the background of two kinds of circulation. The increasing of divergence variability has perfect corresponding relationship to the appearing of the snowstorm peak value, and it is an initial lead of 12～18 h.
Key words
Shanxi /
Heavy snowstorm /
Flow pattern configu /
Physical quantity di
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