关键词: 天水市, 天水市, 云量, 气候要素, 影响, 研究

Abstract: In order to analyze the forming reasons of blizzard process in south central Shanxi Province, using conventional and unconventional weather observation and monitoring data, the author analyzed a blizzard process during 4- 6 February 2014 from aspects of sky and ground weather situation, mesoscale flow type configuration, the vertical profiles of radar echo and physical field. Results showed that the blizzard process was at 500 hPa westerly trough, influenced by the south trough, and controlled by the southeast airflow in front of the ground inverted trough. 500 hPa westerly trough, the 700 hPa southwest jet and crosscutting, and 850 hPa southeast jet was the mesoscale favorable configuration for blizzard. Echo intensity was in 15-30 dBz, belonged to the stability of continuous uniform snow echo. Physical quantity of wet air column under 200 hPa and 80% relative humidity, troposphere of consistent upward movement, high-level divergence and low-level convergence constituted the environmental conditions in favor of heavy snow.