Analysis of a Downburst Event with Gust Fronts
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Abstract:
Using the AWS data of Hubei Province, conventional observation data and Doppler data, a downburst with gust fronts happened under the control of a subtropic high in the summer of 2017 is analyzed. The results indicate: (1) This downburst with a distinct gust front was caused by a pulse thunderstorm. (2) The interaction of topography and local thermal condition made the strong echo move to the southwest. (3) The gust front was very close to the echo at the beginning, so the strong echo made the local heavy precipitation last for a long time, and the strong downward flow and heavy precipitation led to a wide range of gale that mainly distributed near the front of the moving direction of the strong echo. (4) In the later stage, the gust front moved faster than the echo, so the echo weakened rapidly and the strong downward flow caused the ground gale. Then two gust fronts appeared and met each other. At this time, the gale mainly appeared at the intersection of the two gust fronts and the place with the strongest cold outflow of the thunderstorm. The conclusions can provide a useful reference to nowcasting.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.