The paper discusses wildfire growth simulated by the FARSITE model using high-resolution wind fields over complex terrain extracted from operational runs of the MM5 weather forecast model supported by the USDA FS Rocky Mountain Center (RMC: http://www.fs.fed.us/rmc/). The original 12-km resolution wind field (simulated by MM5) has been scaled down to 100 m using diagnostic scaling routines from the Local Analysis and Prediction System (LAPS). This approach provides the opportunity to better model conditions sensed by real fires. We use the August - September 2003 Snow-Talon fire in Montana to illustrate this new capability.