ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Research on Tropical Cyclone Fine Nowcasting System Based on Doppler Radar
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Abstract:
Typhoon and local rainstorm are the primary meteorological disaster in summer fl ood season in Zhejiang. The principal method is based on the primary radar infor mation in the threedimensional variation assimilation for typhoon nowcasting t echnique and research. Automatic echo identification, echotracking and precipi tation estimation are developed by researching the radar information of last yea rs and modulating the parameter for local. The crosscorrelation technique and centroid method are used for strong convection echo identification and tracking. The moving direction tendency of the mesoscale convective cloud clusters and th e realtime data of autoprecipitation station are considered. The dynamic pre cipitation is evaluated by applying the bestprobabilitywindows to get the mo st suited ZI relationship. Through the retrieved variation correction, the rainstorm nowcasting within 1 hour is made by use of linear extrapolation. Cons idering the requirement of typhoon shorttime forecast service, the system cont ains the rapid diagnostic analysis for typhoon center and mesoscale circulation pattern based on GBVTD (Groundbase Velocity Track Display method). As a workin g platform，the system can be used for disaster weather forecasting and service.
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