Abstract:Pearson-Ⅲ distribution,Lognormal distribution,Exponential distribution,and Gumbel-Ⅰ distribution are used to fit precipitation extreme of short period (5min,10min,15min,20min,30min,45min,60min,90min,120min) from 1959 to 2000 in Guangzhou. The fitness is checked up by Kolmogorov test. The results show that short-period precipitation extreme of Guangzhou is subject to the Pearson-Ⅲ distribution.

Abstract:Rotated empirical orthogonal function (REOF) method is carried out for body comfortability of 90 stations in Shandong Province from 1971 to 2000.The results indicate that the body comfortability fields are spatially divided into 2 subregions. Based on this result,the trend of body comfortability in each region is analyzed. Coastal region is the most comfortable one and the hot uncomfortable feeling mainly exits in the mid and west region and the cold uncomfortable feeling in the other regions. In recent 30 years,body comfortability in Shandong tends to be hotter.

Abstract:Obvious urban heat island effect has been developed at the Pearl River Delta urban group for the last ten years. The annual urban heat island intensity rose from 0.1℃(1983) to 0.5℃(1993). The urban heat island intensity of the Pearl River Delta urban group has obvious monthly difference and daily difference,it is the strongest in November,but the weakest in April. The urban heat island intensity during the nighttime is stronger than that during the daytime for annual-average. For spatial distribution,the intensity in the center part is stronger than that in the ambient part,which closely correlated with economical activity.

Abstract:The medium-range numerical weather forecast system T213 became an operational one on 1 September 2002 in the National Meteorological Center. As the core of the new system,the global model T213L31 uses some new numerical techniques and time integration scheme,which include the introduction of the semi-Lagrangian treatment of advection,the use of a reduced Gaussian grid,improvements to the model's basic architecture,the application of distributed memory and shared memory parallelization,realizing the running of high resolution model on the computers now available in National Meteorological Center. It is even more important that,T213L31 uses some new physical parametrization schemes with more realistic physical concept,for example,the schemes for radiation,subgrid-scale orographic drag,convection,clouds and land surface parametrization,therefore overcomes a lot of problems that T106L19 suffers and enhances the forecast skill obviously.

Abstract:The explanation and reanalysis and appraise method of dynamical extended range forecast products are used at 58 stations in Gansu Province. Comparison makes clear that the rate of accurate of explanation and reanalysis method of dynamical extended range forecast products is fairly higher for continued forecast and vocational work mark. Analysis of good/fault forecast of the circulation features in Jan. and Jul.,and forecast appraise in different areas of Gansu Province are made.

Abstract:Precipitation and temperature data of 41 years at 123 stations in Shandong Province is analyzed. Evaluation principles of operational precipitation and temperature forecast are made based on statistics. An evaluation method of precipitation forecast characterized by χ²(n) distribution and an evaluation method of temperature forecast characterized by normal distribution are put forward.

Abstract:The predictions of three urban air pollution methods,statistical method,numerical model and empirical prediction,are compared against the daily SO₂,NO₂ and PM₁₀ ground mean concentrations observed in Tianjin urban area. The emphasis is on the objective evaluation of prediction effects of these urban air pollution prediction methods in Tianjin urban area.

Abstract:Distribution and variation characteristics of mesoscale precipitation of tropical cyclones landed in Guangdong are studied with the data of hourly precipitation from satellite and surface observation. The results indicate that the distinct variation of mesoscale precipitation distribution between before and after tropical cyclones landfall occurs. Mesoscale precipitation distribution became more asymmetrical after tropical cyclones landfall varies with time. The mesoscale precipitation distributes quasi-symmetrically near the center of tropical cyclones in 10 hours after landfall. But it happens after 10 hours that mesoscale precipitation distributes asymmetrically near the center of tropical cyclones or far away center of tropical cyclones.

Abstract:The information of the heavy rainfall and mountain torrent in Zhangjiajie,8—10 July 2003,such as the main influential system,the physical diagnosis field data,the data of Doppler radar echo and automatic weather stations,is analyzed. The primary emphasis is especially put on the favorable effect of special terrain and more night heavy rainfall in Zhangjiajie. It provides some helpful instructions for the forecast of rainfall and mountain torrent in the northwest of Hunan Province.

Abstract:An enormous mud-rock flow calamity broke out in Min and Dangchang County,Gansu Province on May 31,2000. The loss of the event are 76% of the total of the landslide and mud-rock flow calamity in Longnan in the last 20 years(1980—1999). The formation causes and climate conditions of geological calamity in Longnan are analyzed.

Abstract:Based on the monitoring data of everyday air quality of Weifang Environmental Monitoring Center and the observations of Weifang Meteorological Bureau from 1993 to 2002,the temporal-spatial characteristics,the variation tendency of the urban air quality and their relations with the meteorological conditions are analyzed. Results indicate that the TSP is concluded as the primary pollutant in those three matters (SO₂,NO_Xand TSP,which affect the urban air quality of Weifang),those three matters are more in the winter half year and less in the summer half year,and their densities have decreased with years. According to the grading of National Unified Standard,the air quality grades of 33.5% of the days are above the third grade (API>100) ,which decrease 5.96 days per annum. In accordance with the urban air quality,the relationships between the height of the mixed layer,fog and the other weather phenomenon (soot,floating dust and flying sand) and the air pollution are analyzed.

Abstract:An Internet network weather forecast consultation system of Yunnan Province based on Internet network covering all counties and cities of Yunnan is introduced. In the system,the network technology and the data base technology are adopted. The ability of system has realized for the weather forecast issues of the whole Yunnan Province,for weather forecast BBS,system management and weather forecast consultation and online short news transmission,etc.