Preliminary Analysis on the Wind Retrieval Method in Nowcasting

Extrapolation nowcasting of radar echoes is implemented based on reflectivity data and radial velocity data of Doppler weather radars. VAD algorithm is used to retrieve wind fields, which are used as motion vectors to implement the extrapolation for the reflectivity data within 60 mins. Extrapolation nowcasting results of a weather case by the method agree well with the fact according to radar echo images and statistics. However, nowcasting accuracy decreases as the extrapolation time increases.