Drift Smoke 3 : Smoke that has drifted from its point of origin and lost its original billowing form. Drift smoke can fill in canyons under stable air masses and make it difficult to see spot fires
National Wildfire Coordinating Group (NWCG), Glossary of Wildland Fire Terminology, NWCG Program Management Unit, National Interagency Fire Center, Boise, ID, USA 2014. http://www.nwcg.gov/pms/pubs/glossary/pms205.pdf, (For Fr - Amer) {45}