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Nowcasting of severe convective weather in the northcentral region of Ningxia within 0 to 1 hour based on radar tracking and extrapolation is realized by using the Yinchuan Doppler Weather Radar data, by means of the TREC algorithm with the localized quality control of radar data. The webbased Ningxia nowcasting system is established on the basis of Google Maps with highresolution geographic information. This system can display multisource meteorological data, such as data of radar, satellites, lightning position finders, etc.， as well as various derived and forecasted products. It can also provide forecasters with technical support according to the distributional characteristics of terrain conditions, population, industry and agriculture.