On 19-21 July 2016 North China experienced an extreme rainfall event, which is characterized by wide influence range, large accumulated rainfall, long duration and locally large rainfall intensity.In terms of the rainfall amount, it is the most severe rainfall event since August 1963.The intensity and duration of rainfall in Hebei province and Beijing exceeded that of "7.21" in 2012.The characteristics of the weather system development, the path of the Yellow River cyclone are analyzed with the data of ground automatic station, satellite and NCEP data.The deep low vortexes over North China, the westerly trough associated with the low vortex, the subtropical high and the Yellow River cyclone induced by the low vortex are the direct influencing systems of the rainstorm.Because of the blocking of the subtropical high, the cyclone moved very slowly.Additionally, the path appears counterclockwise rotation twice during the movement.It is found that the surface cyclone center always moves along the warm advection in the middle and lower layers and the region with large differential vorticity advection in the lower and upper layers.Meanwhile the positive feedback generated by the latent heat release and the vercital movement, guides the cyclone moving to the place where the vertical movement is strong.The latent heat plays an important role in the growth of low level potential vorticity, which is beneficial to the generation of cyclone.At the same time, the high-altitude vortex is coupled with the low-altitude system, and has a positive feedback effect with the warm advection over the surface cyclone, which leads to the rapid development of the surface Yellow River cyclone.The dry zone in the dark region of water vapor in satellite water vapor image has the characteristics of high vortex, which is analyzed by combining it with the high level potential vortex field, which is helpful to judge the development and evolution of high-altitude dynamic characteristics in the water vapor image, and provides reference for the monitoring of extratropical cyclones.
Yale ZHANG
,
Xiaoding YU
. Analysis on the Causes of Development and Evolution of the Yellow River Cyclone Rainstorm Process[J]. Plateau Meteorology, 2021
, 40(1)
: 74
-84
.
DOI: 10.7522/j.issn.1000-0534.2019.00103
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