An efficient weighted interpolation technique is used to generate a time series of wind fields from the measurements of seven strategically located weather stations in Greater Hong Kong. This wind-field model, HKWIND, is integrated with the atmospheric dispersion/consequence model RADIS to form a complete off-site nuclear accident analysis package. A study is also performed that compares the calculational results of accident consequences with and without wind-field models. The inclusion of the wind-field model has a drastic effect on the puff trajectory and subsequently increases the frequencies of early fatality, early injuries, and latent cancers for Hong Kong.