Watch for smoke near Prineville tomorrow as fire officials plan another prescribed burn. Specialists with the Prineville Bureau of Land Management will be burning 100 acres of piles along the George Millican Road several miles south of the Prineville Airport. The project is expected to begin tomorrow and take two days to complete, depending on weather.   The piles are leftover from a juniper thinning project designed to restore habitat and remove hazardous fuels. Most of the woody material was made available to the public for firewood cutting; but some smaller limbs and branches remain. No road closures are anticipated with this project, but smoke could affect visibility in the area so you are asked to drive carefully.