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Chinese Agricultural Science Bulletin ›› 2017, Vol. 33 ›› Issue (24): 101-105.doi: 10.11924/j.issn.1000-6850.casb16070090

Special Issue: 农业气象

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Diagnosis Analysis of a Vortex Snowstorm Process in Late Spring in Northern Hami

  

  • Received:2016-07-16 Revised:2017-01-16 Accepted:2017-01-17 Online:2017-09-05 Published:2017-09-05

Abstract: To study the causes of snowstorm weather in eastern Xinjiang, improve the forecast level of similar disaster weather, and provide references for forecasting snowstorm, the authors analyzed the regional automatic weather station data and NCEP/NCAR reanalysis data of Junmachang (north of Hami) from May 20 to 21, 2016. The results showed that: the snowstorm was formed by the influence of low vortex and ground cold front in the north of Xinjiang, under the background of the polar front jet stream with obvious south extension; a strong upward motion between 550 and 750 hPa provided power for snowstorm and continuous water vapor flux divergence below 600 hPa provided water vapor for snowstorm; the warm advection of the early stage provided thermal conditions for the appearance of precipitation, and then the strong cold advection decreased the temperature, leading to snowfall; the vertical distribution of the middle to low frontogenesis and frontolysis made a good correlation with the duration of precipitation; significant southward movement of polar front rapid zone provided favorable circulation conditions.