Composite Analysis of Five Hail Events
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Abstract:
Hail events occurred in Handan on 10 May 2005, 11 and 28 June 2005, 13 July 2005 and 20 June 2004, respectively, are analyzed by means of the conventional observation data and radar echo data to analyze compositely the five hail events from the aspects of weather situation, physical vector fields, and evolution features of radar echoes. The results show that the hail weather appeared under the unstable stratification of convection conditions: the middle or top layer is dry and cold, but the low layer is humid; there existed a mesoscale convergent shear on the ground; the heights of the 0 ℃ layer, -20 ℃ layer and strong vertical wind shear were favorable. The findings conclude that Doppler radar can properly monitor and measure the development and evolution processes of the mesoscale weather systems; the variation of echo intensity, echo top heights, wind speed, the emergence of adverse wind areas, and the sudden increase of OHP (OneHour Precipitation accumulation) and VIL (Vertical Integration of Liquid water) values can be the indicators of hail emergence.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.