Archive > Volume 47 Issue 6 > 2019,47(6):976-985 Prev Next

Analysis of a Local Strong Hail Process in Early Spring of 2017 in Western Hubei Mountain Area

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    Abstract:
    Using the conventional ground and upperlevel synoptic charts and radar observation data, the cause of a local severe hail weather process in the Enshi mountain area of Hubei Province on 15 April 2017 is analyzed. The results show that the thermal effect of warm and low pressure systems on the ground before the front strengthened the convergence and the accumulation of the unstable energy on the ground, and made the warm and wet unstable stratification under the dry and cold condition more obvious. Under the action of the dynamic uplift of the mesoscale convergence line, the uplift of the lowlevel convergence triggered the release of convective unstable energy, and coupled with the uplift of the favorable bellshaped terrain of the mountainous area, the development of the severe convective weather was stimulated. In the process of the severe convective weather, the multicell storms had the feature of one’s strengthening companying with the weakening of another. Under the favorable atmospheric environment and terrain conditions, the development of multicell storms was strengthened and the strong storms were maintained for a long time, which were the important reasons for the local strong hail. The vertical structure of hailstorm cell reflects the typical characteristics of the lowlevel inflow, weak echo zone, highstrength echo overhang, etc., and the combined action of the middlelevel radial convergence and the divergence of the storm top made the storm cell maintain and develop, which is also an important cause of the local hailstorm. The monocell storm reflectance factor reflects that it maintained above 60 dBz for a long time and corresponded to a large VIL value. The strong hail weather had the characteristics of strong locality and small impact scope. The main reason is that the vertical wind shear of 0 to 6 kilometers was not large. At the same time, the middle and lowlevel wet layers were shallow, and the wet area on the ground was obviously southward.

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External LinksChina Meteorological AdministrationCMA Meteorological Observation CentreChinese Academy of Meteorological SciencesBeijing Meteorological ServiceNational Satellite Meteorological Center
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