(1) Project background and main scientific and technological innovation contents
The 2010 Shanghai World Expo is held during a period of frequent sudden and severe weather in Shanghai in summer. The complex underlying surfaces of large cities have a significant impact. More than 70 million visitors and more than 20,000 various activities have raised the issue of research and development of refined weather forecasting technology. Huge challenges and rigid needs.
The research of this project belongs to the field of atmospheric science. Aiming at the outstanding problems of refined meteorological element forecasting, it breaks through key technologies such as dual-Doppler weather radar three-dimensional wind field inversion, dynamic quantitative precipitation estimation and multi-source observation data fusion, forming an internationally advanced comprehensive urban observation data dynamic fusion analysis system; systematically studied the mechanism of the occurrence and development of strong convective weather in Shanghai and surrounding areas, and established a conceptual model and objective forecast method for heavy rain weather in Shanghai; It has solved the key technologies of objective interpretation of multiple models, and the accuracy of short-term (0-72 hours) time-sensitive forecast of common meteorological elements has increased by 10%-20% on average compared with the direct output of the model; innovatively carried out weather effects on urban transportation, electricity, etc. Research on impact forecast technology provides full-scale, all-round and embedded tracking services for the guarantee of major activities and the safe operation of the city in recent years; An integrated long-term, medium and short-term forecast production system for large cities with independent intellectual property rights has been established to achieve refined forecasts of the city's 5-kilometer grid resolution and more than 110 townships, towns, streets, and key functional areas.
(2) Technical and economic indicators

1. Dual-Doppler radar wind field inversion was put into operation for the first time, and the dynamic fusion analysis system of urban comprehensive observation data reached the international advanced level;2) For the first time, the activity laws, evolution characteristics and conceptual model of occurrence and development of strong convective weather in Shanghai were systematically studied., realizing classified forecast of strong convective weather. For two consecutive years, the warning time limit for strong convective weather was 33.9 minutes and 31.7 minutes respectively, with a hit rate of 100%, ranking among the leading level in China; 3) The accuracy of refined weather forecasts has been significantly improved. In recent years, the quality of refined urban forecasts has ranked among the best in all provinces in the country. Among them, in 2013, the minimum temperature forecast ranked second in the country, the highest temperature ranked first in the country, and the precipitation forecast ranked 18th in the country;4) It took the lead in establishing a rainstorm forecast and early warning service based on urban exposure and vulnerability, with an average forecast error of urban hourly electricity load of about 4%; 5) An integrated forecast production system for large cities with independent intellectual property rights has been established, ranking among the leading domestic level in grid forecast correction and intelligent product generation technology;6) The project has published a total of 33 papers (3 SCI or EI, 28 core papers), participated in 3 international conferences, obtained 3 software copyrights, and trained 3 senior engineers.
   (3) Promotion and application and economic and social benefits

1. Achievements In major meteorological support services such as the 2010 Shanghai World Expo, the 14th FINA World Championship, and the F1 Grand Prix, the service benefits are remarkable. The project supporting unit was awarded the "Advanced Collective of the Shanghai World Expo" by the Central Committee of the Communist Party of China and the State Council, the "Advanced Collective of the World Expo Work" by the Shanghai Municipal Party Committee and the Municipal Government, the "Pioneer Advanced Collective of the World Expo Guarantee" by the Shanghai Municipal Party Committee Federation of Trade Unions and others, and the "Advanced Collective of the World Expo Science and Technology" Award was awarded by the Ministry of Science and Technology.
2. The results have been applied in flood season forecast services in recent years and have played an active role in urban safe operation and disaster prevention and reduction. In 2011 and 2012, it was rated as an "Advanced Collective in Major Meteorological Services" by China Meteorological Administration for two consecutive years. In 2013, it was awarded the title of "Shanghai City Flood Control Work Model Collective" by Shanghai City Flood Control Headquarters.
3. The complete set of results has been promoted and applied in meteorological stations in various districts and counties in Shanghai City. Relevant results have been promoted and applied and provided service guarantees in Shanghai City Flood Control Headquarters, Taihu Basin Administration Bureau, Shanghai City Electric Power Company, Shanghai Electric Group and other units, with good feedback from users.
4. The refined grid point forecast editing system has participated in the China-Australia Meteorological Science and Technology Cooperation Project (China-Australia JWG-14), and related technologies for grid point forecast correction and intelligent forecast generation have been recognized by international counterparts.
5. The public satisfaction rate has improved significantly. Since 2005, citizens 'scores on weather forecasts have increased year by year, reaching 98.5 points during the 2010 World Expo.