Lack of winds and the fact that the fire "lays down" overnight makes for some very hazardous air quality in the Sisters area.
Frank Messina with the Department of Environmental Quality says they need to remind people that the air quality, especially in the early morning is very bad. "It’s sorta like an inversion, when you get those cool mornings, and you have that warm air on top, it will just sock down and it will prevent a lot of wind. And it's great for firefighting, because hopefully, the dew and everything, you can try to help put it out. But it does affect low lying areas, and sisters happens to hit that area."
Messina says the Sisters area is hit the hardest because they are close to the fire, and recommends everyone stay inside as much as possible.
He says the weather forecast indicates there will be several mornings when the smoke will be particularly bad, but Bend and Redmond should be spared the dangerous levels.