An attempt is ongoing at the Hong Kong Observatory to use high-resolution numerical weather prediction (NWP) model to support aviation weather service at the Hong Kong International Airport (HKIA). The NWP model, called Aviation Model (AVM), has a spatial resolution down to 200 m for simulations in the region around HKIA. Two possible models have been tested as tentative candidates of AVM, namely, Weather Forecasting and Research (WRF) model and Non-hydrostatic Model (NHM) adopted from Japan Meteorological Agency. Based on selected case studies, it was found that WRF has lower root-mean-square-error for wind forecasting up to 9 hours ahead, and its efficient modelling code makes it a possible NWP model for real-time execution of AVM in the future. The performance of WRF in the simulation of significant windshear at HKIA is also studied by considering a number of typical windshear cases. The simulation of sea-breeze related windshear is quite successful, and the headwind change as observed from flight data could be reproduced in the model results. For terrain-induced windshear, WRF is able to capture the salient wind patterns, though the simulated headwind profiles may not capture the abrupt changes of the wind at times.