This loop of GOES-8 visible channel imagery shows smoke over Idaho and Montana on 14 August 2000. During the morning hours (early in the loop), the smoke over central Idaho is restricted to the deep valleys within the Salmon River Mountain region; as winds increase in response to daytime solar heating, the smoke is then ventilated from the valleys and mixed upward into the boundary layer, where the southwesterly flow transports the smoke northeastward across Montana. Smoke plumes can also be seen from several fires in Wyoming.