The U.S. Army Cold Regions Research and Engineering Laboratory (CRREL) supported unmanned aircraft flights in a specified airspace domain at Yuma Proving Ground (YPG) in November and December 2007. The Battlefield Environment Division of the Computational and Information Sciences Directorate (CISD), Army Research Laboratory (ARL), was asked to provide real-time meteorological modeling support and weather products such as low-level wind and turbulence forecasts at YPG to help determine areas and ...