Doppler Radar Characteristics of a Multistorm Severe Convective Weather Event in Middle Zhejiang Province
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Abstract:
A severe convection process on 18 May 2018 is studied by the conventional observation data, GFS analysis field data with the spatial resolution of 0.25°×0.25° and temporal resolution of 6 hours, automatic weather station data, and SB Doppler radar data in the middle part of Zhejiang Province. It is demonstrated that this process triggered three types of storms: pulse storm, multicell storms and squall line. These storms were accompanied by the hail shortterm heavy rain, thunderstorm and gale, respectively. The corresponding characteristics of the radar echoes of three storms are as follows: (1) The radar echoes of the pulse storm were in lumpy pieces. The initial height was 6 to 9 km and the heights of strong echoes were around the isotherm of -10 ℃. The strong intensity was up to 60 dBz. The VIL value increased rapidly and the maximum value was 50 kg·m-2. The small hail and gale appeared after the rapid decrease of reflectivity and VIL. (2) The mediumtostrong multicell storms were in a beltlike distribution. The train effect and high precipitation efficiency were responsible for the wide range heavy precipitation. The gale was in relation to MARC (MidAltitude Radial Convergence) of the velocity product and strong convergence. (3) The squall line appeared to be a bow echo. It moved with high speed and caused the extreme gale and thunderstorm. This multistorm severe convective process is of important significance for shortterm weather forecasting in the future.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.