Simulation and Diagnosis of the Evolution Characteristics of a Mesoβ Scale Heavy Rainstorm Event in Hubei in 2013
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Abstract:
Based on a variety of densely observed data from automatic surface weather observation system, NCEP/GFS 0.5°×0.5° analysis data, the temperature of black bold (TBB) observed by FY2E satellite, the evolution of the heavy rainstorm process in Hubei Province during 5-6 July 2013 is analyzed. Using the highresolution output from WRF model, the evolution of the mesoβ scale systems is diagnosed. The results show that the severe convection took place in the overlay zone of positive vorticity in front of trough at 500 hPa, the shear line of low layer near jet flow nucleus, the upper divergence and the instability energy. There were three mesoβ scale systems in the largescale favorable weather situations, and the heavy rainfall groups were associated with the development of the convective systems. Considering the coalescence growth of droplets of the saturated water vapor, cloud water and cloud ice, the WRF model diagnosis is discussed through the precipitation rate of flux divergences. We have found four mesoγ scale systems in rainbands from the evening of 5 July to the morning of 6 July 2013, and the physical quantity value could quantitatively estimate the hourly rainfall intensity to some extent. Maximum probable convective precipitation rate could be a better physical quantity value to reflect the relations of the vapor condition in mesoscale rain cluster, thermodynamic condition and rainfall. Thus, it could be applied to the Doppler weather radar nowcasting.