Characteristics of NewGeneration Doppler Weather Radar Echoes for a Severe Vortex Rainstorm
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Abstract:
On the basis of the atmospheric circulation background and the objective diagnosis of physical quantities with newgeneration weather radar data at Xifeng, an analysis is made of the shorttime severe rainstorm event, induced by the Hetao vortex, in Huanxian of Gansu Province on 24 July 2007. The results show that there existed a deep positive vorticity field corresponding to the Hetao vortex in the vertical section; the echo reflectivity factor is greater than 50 dBz before the hail storm, with the strong echo center in the vicinity of the 0 ℃ layer, and there was no obvious “jumping” feature with altitude; the high value centers of horizontal convergence on the radial velocity echo image (≥±20 m/s) were highly active in the layer of 2 to 7 km; there were significant “jumps” of cloud top heights; the area of VIL being greater than 45 kg〖DK〗·m-2 expanded quickly, which has indicative significance for the earlywarning and monitoring of shortrange severe weather and hail suppression operation.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.