>>1613573Well if you know where the wind’s blowing you know where the smoke’s going. In that instance, it was mainly trapped west of the higher terrain east of the Los Angeles area, improving around Palm Springs. The visibility around smoke also depends on vertical mixing; if it’s stable and smooth out the visibility will drop, whereas if the atmosphere is unstable it will mix vertically and improve lateral visibility, to a point. That was a smooth flight, and a very clear layer of smoke existed on the way.