Abstract:Three horizontal patterns of moisture transport are studied during the heavy rain of Mei-Yu.It is pointed out that the process of mean moisture field transfered by disturbance wind hasthe dominate role regardless of low or middle troposphere and 00 or 12 GMT data.Therefore,theeffect of disturbance wind are more important for the regional forecast of precipitation.

Abstract:The variation of wind speed with the altitude is taken into account in the diffusion equationof catalytic agents in stratiform cloud.With the finite-difference method a numerical solution ofdiffusion equation of catalytic agents is sought.In addition,comparition with constant wind speedwith height is made.

Abstract:Eleven longer-term data series are selected from various climate regions in China.The adap-tability of Weibull,Pearson Ⅲ and Gumbel distributions to maximum and extreme wind speed isstudied.It is shown that the Gumbel distribution is the optimum model and the weibull distribu-tion is the worst model for all climate region in China.

Abstract:Moisture transfer associated with the sustained heavy rain in 1991 over the Jianghuai valleyis analyzed,It is shown that 2/3 of the moisture that entered to the Jianghuai Valley during July1—10 1991 came from the Bay of Bangal and the remaining 1/3 from the South China Sea.The evolution of moisture transfer during May 1 to July 10 1991 shows that both the mois-ture transfer from the Bay of Bangal and from the South China Sea are enhanced simultanouslyand they are corresponding to the heavy rain over the Jianghuai Valley.

Abstract:Assessments of ability to typhoon forecast with ECMWF BAF prediction charts from1990—1992 and forecast examples of the three typhoons 9215,9216 and 9219 are made,and theresults show that NWP is more trustworthy than the empirical one.It is indicated that good effectcan be gotten with NWP products and satellite image.

Abstract:Based on the meteorological elments,phenodata and spring maize yield at 30 agrometeo-rological stations from 1981 to 1990,the statistical relationship between climatic resources and theyield variation is established,and the adaptability indexes and classes for planting spring maize aredetermined.

Abstract:The diagnoses of vorticity and energy of severe tropical storm 9216,which landed on China,moved northward and caused the heavy disaster in Shandong Province,are made.The resultsshow that the tropical storm always moved along the positive vorcity center and high energy axis,the heavy rain cores lay near the tip of high energy tongue,and near the centre of positive vortici-ty.

Abstract:Water quantity drained off with wind pump is measured with flowrator and the saltness vari-ation in soil is obtained.An evaluation of economic benefit of draining off salt with wind pump,and a new way to transform salt-alkali land is proposed.

Abstract:The mathematical model of water consumption of spring corn was grven (?)sumption in each developmental stage was calculated.Forthermore,the dynamic model,estimatingirrigating amount of spring corn in different stages,was designed based on water balance equationof farmland so as to judge the developing trend of drought in the future through synthetical con-sideration of weather trend and soil character.Finally,the drought-resistent strategy was made.