Abstract:Some advances in the field of tropical cyclone motion without considering the influence of the environmental basic current were described, including effects of the asymmetric structure, the nonlinear interaction,the topographic,and diabatic forcing on its motion and so on.

Abstract:The cause of aircraft engine icing is analysed. It is showed that the engine intake duct icing is due to the decrease in air flow temperature for air flow acceleration. Finally, the aircraft icing forecast problem has been discussed.

Abstract:Based on the method of the Non-adjacent average value creation,the process of the precipitation sudden change values of Suzhou city from June to August (1953—1994) and the method of the grey incomplete difference recognition, the GM (1,1) models of the grey process of the precipitation sudden change can be established to forecast the years of the waterlogging, normal, drought of Suzhou and the values of the precipitation quantity in future.

Abstract:In 1996 the period of the Jianghuai meiyu was longer, its precipitation was more and the heavy rain during the meiyu period also happened frequently. The situation is a flooding year in the middle and lower reaches of the Yangtze River. The West Pacific subtropical high, westerly jet,the blocking patterns of high and middle latitude,and the evolution of superlong wave and long wave were analysed. The subdivision of the meiyu period in 1996 was given. The non-integer power spectrum of the total meiyu rainfall M in the middle and lower reaches of the Yangtze River in 40 years was studied, where M is the flood and drought index. It is indicated that the regional heavy flood year in 1996 is coincident with the evolution of the drought/flood periods.

Abstract:The variational characteristics of Tibet temperature are analysed by using the monthly mean temperature data of eighteen weather stations from 1961 to 1990. The results show that monthly mean temperature is coldest during the 1960's,and is warmest during the 1980's. The variation of summer temperature is different in three areas. In Tibet, the anomalous warm may occur in different seasons, but anomalous cold is seldom. The periodicity of 22-year, 11-year, 4. 4-year and 2—3-year is significant. There is a good persistence of Tibet temperature in the late winter and summer. Temperature is easily changed in October and November.

Abstract:A rainstorm weather process on July 14 1995 with mean radial velocity data obtained from 3824-type Doppler weather radar was analysed. The boundary layer Jetstream (SE) measured by the radar was accompanied by stronger precipitation. The fact indicates that the Doppler weather radar can play a warning role in mesoscale and microscale weather system watches and severe weather predictions.

Abstract:In view of application and consultation,a series of methods were proposed to collect,manage, analyse and assess drought data by using NOAA meteorological satellite data.

Abstract:The computer decision system about artificial precipitation stimulation and hail suppression was developed by use of the routine meteorological data, satellite image and radar data. The system can give the optimisation about a variety of factors,such as the weather systems in favor of seeding operation,the target cloud system,the operation time and height selection and so on. The system programming structure and the features of the subsystems were described.

Abstract:The key to develop the meteorological information management system involving image data is the acquirement, storage and display of the meteorolog;ical PCX diagram format file. It is suggested that PCX diagram format file may be acquired by the dynamic picture storage software. The PCX file is stored in the remark field of the meteorological data base,and then displayed a-gain by the special UCDOS display Command.

Abstract:By use of the dekad rainfall and isochronal yield data,the relationship between natural rainfall and the rice yield was analysed by the integral regression and multiple regression equations. The results confirm that the increament of early rice yield and late rice yield by the artificial rain enhancement may by averaged to per mu 2. 46kg/mm. ha^-1 and 1. 65kg/mm. ha^-1,respectively.

Abstract:The correlation analysis between the sea temperaturn of the Pacific Ocean and the Holiothis Armigera Hübner generation degree was made, 12 correlation fields were established,2 favourable areas were obtained. The forecast equations were given by use of the principal component analysis and forecast variables. The preper forecast can be made 2 to 3 months in advance. The opera-tionnal forecast from 1993 to 1995 was proved to be coincident with the actual situation.

Abstract:Using live data of ten tropical cyclones and 500hPa upper weather charts,which effected the South China Sea from June to October in 1995,the forecast ability with regard to tropical cyclone track of Japan's 24hr surface numerical forecast and Europe Center of Meteorological Weather Forecast (ECMWF) 500hPa numerical weather forecast were tested and analysed. The results in-dicate: (1) Janpan's 24hr surface numerical weather forecast has some forecast ability to tropical cyclone track tendency,and it is better to the stable track of tropical cyclone,but not good to the sudden changing and recuruing tropical cyclone; (2)ECMWF 500hPa numerical weather forecast has good forecast ability to tropical cyclone track. It can forecast tropical cyclone moving tendency , recurving and sudden changing, landing place efficieritly, and has good reference worth in practice.

Abstract:Since the pressure of VSAT antenna has an effect on the roof of the building,the reason of the pressure and the way of calculating the pressure are explored. The way also can be used to calculate the pressure of another satellite's antenna.