Formation and Characteristics of a Summertime Hailstorm over Northern Taiwan

概要

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Hailstorm is a rather unusual weather phenomenon in Taiwan particularly in the summer season. The hailstorm event occurring over northern Taiwan on 2 July 1998 was investigated using conventional data, Doppler radar observations, and satellite cloud winds. Results showed that an upper-level cold vortex provided favorable conditions for the development and evolution of the storm. The storm appeared to be triggered by the low-level convergence associated with local circulations coupled with the upper-level divergence forced by a jet streak of cold vortex. Backing of winds and vertical shears with height provided by cold vortex appears to be instrumental for the westward propagation and intensification of the convective system. A couplet of mesoscale vortices was observed in the low- and mid-troposphere and was found to be generated by the tilting process on the vertical wind shear through a strong updraft in the convection.
社団法人日本気象学会の論文
2004-04-23