ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
The Synthetic Diagnostic Analysis of a Rainstormcausing MCC on Middle Yellow River
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Abstract:
In order to improve the capability of forecasting and warning of rainstormcaus ing MCC, the diagnostic analysis was made on the synoptic cause and the 3dimen sional flow struc ture of MCC on 2 July 2006 on the Middle Yellow River by using the satellite ima ge, MICAPS and NCEP and Doppler radar data. The result shows that the MCC was t he direct influence system, the formation of warm and wet shear convergence in t he middlelow level, the αscale divergence in the higher level, and the lifting force from low level caused by the cold air mass frontogenesis, all thes e circulation background are favorable to the MCC. The MCC occurred on high ener gy and weak convective instability zone, where the southwest jet on 700hPa and s outh flow on 850 hPa provide plenty of water vapor and energy for MCC. The coupl ing of divergence field and vorticity field and the formation of updraft is the driving mechanism of MCC. The velocity images of Doppler radar show that the low southeast jet develops and maintains, the low jet to flow into the convergence line maintains and the bowlike αscale divergence belt on middle high le vel develops and maintains, all these constitute the 3dimensional flow structu re of the MCC.
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