摘要
[Objective] The aim is to expound the abrupt rainstorm in the central Hunan Province on May 6 in 2010.[Method] By dint of NCEP 1°×1° reanalysis data,routine observation data,auto-station precipitation and FY-2C satellite data,the large-scale circulation background and physical condition during the large rainstorm period from the night on May 5 to 6 in 2010 were analyzed.The large scale environment,meso-scale characteristics and potential causes for the formation of large precipitation were revealed.By dint of FY-2D satellite and water-vapor cloud image,infrared cloud image,4 black light temperature,the variation characteristics of heavy rainstorm convection system were analyzed.[Result] Under the favorable environment background,the rainstorm was induced by the meso-scale convection system,and it had close relation with the upper-air trough,shear line in the middle and low layer,ground weak and cold air and the torrent in the upper and low latitude.The result of all kinds of physical quantities suggested that the meso-scale rainstorm above the air had distinct characteristics and the heavy precipitation was in the middle Hunan Province.It was caused by meso-system.The dynamic dry belt above the satellite,TBB=-60℃ center and the large value area of the gradient could provide references for the forecast and pre-warning of large rainstorm.[Conclusion] The study accumulated experiences for the forecast and report of rainstorm in Hunan Province.
[Objective] The aim is to expound the abrupt rainstorm in the central Hunan Province on May 6 in 2010.[Method] By dint of NCEP 1°×1° reanalysis data,routine observation data,auto-station precipitation and FY-2C satellite data,the large-scale circulation background and physical condition during the large rainstorm period from the night on May 5 to 6 in 2010 were analyzed.The large scale environment,meso-scale characteristics and potential causes for the formation of large precipitation were revealed.By dint of FY-2D satellite and water-vapor cloud image,infrared cloud image,4 black light temperature,the variation characteristics of heavy rainstorm convection system were analyzed.[Result] Under the favorable environment background,the rainstorm was induced by the meso-scale convection system,and it had close relation with the upper-air trough,shear line in the middle and low layer,ground weak and cold air and the torrent in the upper and low latitude.The result of all kinds of physical quantities suggested that the meso-scale rainstorm above the air had distinct characteristics and the heavy precipitation was in the middle Hunan Province.It was caused by meso-system.The dynamic dry belt above the satellite,TBB=-60℃ center and the large value area of the gradient could provide references for the forecast and pre-warning of large rainstorm.[Conclusion] The study accumulated experiences for the forecast and report of rainstorm in Hunan Province.
基金
Supported by Key Project of Hunan Meteorological Bureau "Study on Formation Mechanism and Report Method Based on Comprehensive Meteorological Data"
