Comparative Analysis of Doppler Weather Radar Data from Two Cold Vortex Weather Events
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Abstract:
By means of conventional weather data and new generation weather radar data in June 2008 at Chengde, two coldvortex weather events are compared and analyzed. It is found that an upperlevel cold vortex and a lowerlevel mesoscale shear line are the common influencing systems; severe convective weather caused by the easternMongolia cold vortex is related to the moving track of the cold vortex; the configuration of the wind fields at lower and upper levels and the chimney index are used to determine the size of the vertical wind shear; such factors are highly indicative to severe weather warning as the shape, strength, moving speed, vertical structure characteristics of Doppler radar basic reflectivity, as well as the moving directions of the mesoscale convergence lines, adverse wind areas, vertical shear lines, zerospeed lines on the average radial velocity fields; the jumps and drastic reduction of VIL values have also great significance, VIL increasing gradually with development at the convection stage and decreasing after the beginning of convective weather.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.