ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
The Correlation Analysis between Cloudtoground Lightning Character and Precipitation of 070729 Super Rainstorm
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Abstract:
With the realtime data minutely measured by the lightning locator, and the pre cipitation data minutely measured from the encrypted precipitation station, as w ell as the satellite cloud picture, the cloudtoground lightning character in a super rainstorm occurred in the south of Shanxi on July 29-30, 2007 was anal yzed. The results show that the cloudtoground lightning appeared in the area of 500hPa, between 5840gpm and 5880gpm, and TBB≤-43℃. The areas surrounded by 3 longitude distance, the left side of low jet flow, and 2 - 3 latitude distance, the south side of 700hPa warm shear, enclosed by the area o f TBB≤-63℃ or the south of cloud cluster, big value zone of TBB horizontal gra ds, are the high frequency and dense areas of the cloudtoground lightning. T here is a good correspondence between these areas and rainstorm falling area. T hree meso βscale convective cloud cluster and one MCC are the main convective systems, which resulted in the super rainstorm. The analysis result indicates t hat the time when a couple of meso βscale cloud cluster incorporates is the t ime when the frequency of lightning is higher. The position where a couple of me so βscale cloud cluster incorporates is the area where the frequency of light ning is higher and the precipitation is stronger. There is a good relationship b etween the minutely cumulated number of cloudtoground lightning from single station and the minute precipitation from the encrypted precipitation station. I t can be used to identify mesoγ scale convective system, remotely survey smal l scale strong precipitation, and forecast the coming of rain intensity peak val ue ahead of 3540 minutes. Only in favorable allocation of upper and lower air system configuration, there will be a perfect correspondence between the local c loudtoground lightning frequency and rain intensity change along with time.
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