MODIS imagery from NASA Worldview gave us a clear view of the Fort McMurray forest fires on 6 May 16 with and extensive smoke plume extending towards the south east of the area.
Surface winds appear to be light-ish. The smoke plume is streaming down the flow in the middle atmospheric layers at 5000 ft.
The Worldview system also allows us to analyse the concentration of the combustion product, CO. The following split image, covering exactly the same area, shows the more intense area of carbon monoxide in the white and red arc.