Abstract:The Olympic weather support in Sydney and Atlanta could be regarded as the top level in the world. For learning from them and doing better for 2008 Beijing Olympic Games,the experiences of these two Olympic weather services are reviewed.

Abstract:The short-range climate prediction of the onset and the intensity of South China Sea summer monsoon are studied. The relationships between the South China Sea Monsoon Index (SCSMI) and the environmental fields, such as 850hPa wind, 500hPa height, SST, OLR, are examined. The possible mechanism of the relationship with the South China Sea Summer Monsoon (SCSSM) is discussed. The anomaly of the SCSMI in winter and the previous environmental fields may be used as a earlier signal to indicate the onset and intensity of SCSSM. Based on the above research results, a concept model is raised for the prediction of onset and intensity of SCSSM. The trial prediction in 1998—2001 got a satisfied assessment.

Abstract:Based on the monthly acid rain and meteorological data for recent years in Three Gorge reservoir area, the spatial and temporal distribution features of the intensity and frequency of acid rain are analyzed. By contrasting with relative meteorological elements, it can be found that the intensity of acid rain variation relates to precipitation, wind speed and fog days to a certain extent.

Abstract:Besed on the observation data,thermal effect of environmental conditions in Shijiazhuang is analyzed in detail.The results indicate that the greenbelt of city can adjust the local temperature.The ground temperatures of different underlying surface have obvious diversity.The building or underlying surface,such as asphaltum and cement surfaces have contributed to the increasing temperature of the city.The city enlarging,buildings and hard road surface increasing,and greenbelt reducing are the primary cause which makes the city form thermal island effect.

Abstract:By using conventional data,HLAFS grid point data and GMS-5 stationary satellite infrared cloud picture,the diagnosis and research on synoptic characteristics of typhoon heavy rainfall in the year of 2001 in China,a especially severe rainfall caused by tropical depression on 5th August in Shanghai and physical conditions of severe rainfall from typhoon Liulian (0103) are performed.The results suggested that the dynamics,thermodynamics,atmospheric stratifications stationary and other physical factors have played a major role in the processess of two severe rainfall events investigated.As a result,it will profit us to do real time operational forecast and research work as well.

Abstract:By using daily surface air temperature data of China′s 200 stations during 1951～1999,schemes of analyzing temperature extremum are designed. Firstly, a designed quality control procedure is performed for the daily data. Next, the thresholds of extremum are estimated in terms of the 95th and the 5th percentiles. Finally, spatial distribution of temperature extrema over China for 50 years is discussed and a new technique is proposed for detecting extreme events.

Abstract:The heavy rainfall occurred at Hong Kong and vicinity on Aug. 23,1999 was caused by typhoon ″Sam″. The rain rate and reflectivity distribution at 1km observed by TRMM/PR and HK radar are compared. Generally,they are consistent. Two methods, i.e. average and best match, are used in comparison. The correlation coefficients obtained from best match method are higher than average method. When the distance from HK radar is less than 100km the coefficient is higher. The difference of reflectivity from PR and HK radar has increased with the distance increasing from radar site. When the reflectivity from PR is less than 20dB the value observed by HK radar is larger. Otherwise, the reflectivity from PR is larger. The difference of reflectivity between the two radars increases when the reflectivity from PR becomes larger.

Abstract:The contribution of vertical helicity to heavy rainfall are analyzed by T106 fine grid multi element numerical forecast. A dynamic precipitation products stepwise regression equation is established and the coming 6-hour area rainfall forecast is developed by combining dynamical and thermodynamical physics parameters.

Abstract:An objective local county forecast system for hailfall in Shandong is established by using the multi indictor superposition the weighing coefficient method,the PP forecast method and the productions of the HLAFS numerical forecast.The results of forecast experiments and operational uses show that the system has a good forecast skill.

Abstract:By using the data measured by Mee-130 instrument in August 2000 and 2001,respectively in Maqu-Henan area in the Upper Reaches of Huanghe River,the CCN features of content variation, supersaturation ,visibility ,wind and weather conditions are discussed. By comparison with the results of some others regions, the content of natural condensation nucleus in the grasslands of Qinghai-Xizang Plateau is less than others, such as Qingdao the sea types with the CCN supersaturating spectra.

Abstract:The large scale circulation of Huaihe river basin drought event in the autumn of 2001 is analyzed, and further,the circulation features at 500hPa in flood/drought years are comparatively studied.It is shown that the west Pacific subtropical high is located more north,and its west ridge and stretches more west than the mean, which are main causes of Huaihe basin drought event in the autumn,2001.

Abstract:Based on the analysis of characteristic of circulation and meteorological variables,and comparing the effects of two ″cold of the late spring″ weather events on mountain fruit in the Weifang,Shandong Province,it is found that the warm temperature in the early spring is the key factor.Three methods to prevent the ″cold of the late spring″ weather are provided.This will be benefit to fruit industry of Weifang Region.