"We've got a couple of very challenging days ahead of us," fire operations manager Mark Goeller said late Thursday. "You're going to see a lot of smoke in the air and a lot of ash fallout."
Montana wildfire grows, destroys 2 homes →
Oklahoma Forestry Commission fire management chief Mark Goeller says the largest fire burned about 390 square miles in Beaver County.
The Latest: Wildfires prompt Oklahoma emergency declaration →