ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
The MultiScale Characteristic Analysis of a Meiyu Front Heavy Rainfall in Eastern North Jiangsu
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Abstract:
In this paper, a most severe Meiyu front heavy rainfall was analyzed by use of the satellite imagery, Doppler radar and groundbased observations data, and the characteristics at different scales of the this weather system were revealed.The results are summarized as follows: (1) This process is an atypical Meiyu front convective storm, with the Baikal blocking high as background conditions. (2) Synoptic scale highaltitude trough, southwest vortex, lowlevel jet and ground cyclone provided the heavy rainfall with strong impetus and moisture conditions. (3) On mesoα scale, the vertical structure of the storm system was the strong lowlevel convergence and upperlevel divergence, with a strong updraft in its center. At the same time, in the highlevel, on the north side of the system there was a highaltitude jet which forces to produce a secondary circulation. And the secondary circulation of ascending branch, caused by jetstream of many mesoscale vortices on ground, provides the heavy rainfall with persistently necessary power, water vapor and unstable conditions. (4) There was an evolution of MCS on the cloud imagery. The “counterwind zone” and mesocyclone on the speed map corresponding to the bow echo of radar were just the mesoγ system of tornadoes leading to the shortterm heavy rainfall.
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