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A radar reflectivity observation operator with ice‐phase hydrometeors was employed for the assimilation of the real radar observations of a squall line on June 14, 2009, over Anhui and Jiangsu provinces in China. The three‐dimensional variational (3DVAR) data‐assimilation system along with the Weather Research and Forecasting (WRF) model was applied. The impact of assimilating radar radial velocity...
The background error covariance is an important component in data assimilation systems, which largely dominates the error correlations between different analysis variables. This study aimed to assess the impact of the determination of the background error length and variance scale factors on the track and intensity forecast of hurricane systems for radar radial velocity (Vr) data assimilation. To...
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