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Comparative Analysis of Two Rainstorms in the Southwest of Hunan Province

Meteorological and Environmental Research 2012年第12期3卷 20-28,32页

作者： LV Xiao-hua DAI Jin YANG Ke ZHU He-xiang Shaoyang Meteorological Bureau in Hunan Province Shaodong County Meteorological Bureau in Hunan Province

Using NCEP 1° × 1° reanalysis data within 6 h, conventional observational data, data from regional automatic rainfall stations, satellite cloud pictures and Doppler radar data, we compared the physical conditions, dynamic and thermodynamic characteristics of two rainstorms in the southwest of Hunan Province on May 12 and June 15 in 2011. The results showed that the first process was triggered by strong cold air under unstable potential, while the second process was caused by shear line appearing from the east; during the first process, cold air divided into many parts and moved towards south, rainfall was uniform and lasted for a long time, while rainfall was relatively concentrated and strong, and lasted for a short time during the second process; the peak of K index appeared only during the second process; no sign of heavy rainfall was found from satellite cloud pictures and radar echo pictures during the first process, while obvious cloud cluster and echo ribbons could be found from satellite cloud pictures and radar echo pictures during the second process, which were the sign of heavy rainfall; slow movement of echo or little movement resulted in the second rainstorm, and constant echo intensity was the main reason for the occurrence of the second rainstorm. In addition, there was low-level southwest jet during the two processes, which provided favorable conditions for the transportation of water vapor and energy during the two processes. However, there was a great difference between the two rainstorms in the intensity and thickness of low-level jet, that is, the intensity and thickness of low-level jet during the first process were obviously weaker than these during the second process.

关键词： Rainstorm influence system Comparative analysis Water vapor conditions Southwest jet Radar echo China

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Analysis on the Heavy Snowstorm Process in Northeast China during March 3-5 in 2007

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Meteorological and Environmental Research 2010年第11期1卷 15-19页

作者：効碧鸿宋长远张晶张凯荣辽宁省本溪市气象局辽宁本溪117000 辽宁省营口市气象局辽宁营口115000

Based on the routine observation data,the satellite cloud images and so on,the synoptics analysis and the diagnostic analysis of physical quantity field were used to analyze the heavy snowstorm process which happened in Northeast China during March 3-5 in *** results showed that the main influence systems in the process were the eastward shift and up north of southern cyclone,the combination of south and north branches upper troughs in 500 *** dynamic mechanisms of heavy snowstorm formation were the strong ascending movement which was caused by the configuration of high-layer divergence and low-layer convergence,the generation and maintenance of deep and thick positive vorticity in the middle and low *** sufficient water vapor in the East China Sea and the South China Sea which was brought by 700 hPa by south low-level jet stream reached Northeast *** falling zones of strong precipitation were consistent with the big value zones of 850 hPa positive vorticity and 200 hPa positive ***,the intensity of temperature advection and the position of cold warm transition zone could reflect well the intensity and falling zone of precipitation.

关键词： Snowstorm Large-scale circulation situation influence system Diagnostic analysis China

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Analysis on Formation Reason of the " 7.28" Regional Rainstorm in Zhongwei

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Meteorological and Environmental Research 2011年第11期2卷 37-41页

作者： NIE Jing-xin 1,BAI Ling 2,LI Bao-hua 2,ZHANG De-you 2,YANG Yuan 2 1.Ningxia Meteorological Observatory,Yinchuan 750002,China 2.Zhongwei Meteorological Bureau in Ningxia,Zhongwei 755000,China

[Objective] The research aimed to analyze formation reason of the ' 7.28' regional rainstorm in Zhongwei City.[Method] NCEP /NCAR reanalysis data and Micaps routine data were used to analyze formation reason of the regional rainstorm in Zhongwei City on July 28,2011.[Result]Under the east-high-west-low circulation situation,factors which caused this rainstorm included westerly jet at 200 hPa,cold trough at 500 hPa,low vortex and shear line at 700 hPa,quick alternation of the warm and cold airs at 850 hPa,stable northward movement of the subtropical *** zone of the rainstorm was located at the right of the upper jet,the left of the low-level jet and the south of 700 hPa shear *** on the each physical quantity field showed that water vapor condition,vertical motion,energy,vorticity,divergence and wind field distribution over the rainstorm area were all beneficial for rainstorm *** the rainstorm occurred,radar echo mainly presented as mixed-cloud precipitation *** echo intensity was from 30 to 45 dBz,and top height of the echo was from 7 to 8 km.[Conclusion]The research provided some experiences and theoretical guidance for future rainstorm forecast in Zhongwei City.

关键词： Regional rainstorm influence system Diagnostic analysis Radar echo China

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