Drift smoke describes smoke that has drifted away from the area in which it originated, and is no longer dominated by convection. Drift smoke has the potential to give the false impression of a fire in areas where the smoke has drifted.
Source: National Wildfire Coordinating Group. 2012. Glossary of Wildland Fire Terminology. PMS 205. Accessed on 9 September 2013. Available at http://www.nwcg.gov