| Abstract: | This article will use conventional survey data, NCEP reanalysis data, and Doppler radar data to analyze the circulation situation characteristics and causes of the snowstorm process in Tongren City on December 29-30, 2018. The results show that this snowstorm process occurred Under the background of the circulation of the high altitude south branch trough, multi-fluctuation trough eastward, 700hPa southwestern warm and wet rapids transport, and 850hpa northeast return cold pad, it has the characteristics of long duration, wide range, high intensity, and deep snow; strong snowfall stage The lower layer of the troposphere has a steady stream of water vapor transport from the Meng Bay, the thickness of the wet layer is enhanced, and there is a strong water vapor convergence; the strong vertical ascending movement of 700 hpa and the strong vertical wind shear in the middle and lower layers of the troposphere are conducive to the occurrence of snowstorm weather ; Cold advection over the blizzard area at the time of heavy snowfall superimposed on low-level warm advection, near 800hpa is the intersection of cold and warm advection; this snowfall has convective and continuous characteristics, and the radar reflectivity echo cloud has train effect. |
