(Okanogan County, WA)  --  Sixteen large wildfires that are burning across central and eastern Washington are covering an estimated 920 square miles.  More than 200 homes have been destroyed and another 12-thousand remain under threat.  Smoke is lifting over some areas of north-central Washington, but fire officials warn that smoke often works as a ceiling on fire activity and when it lifts, fire activity often increases because of decreased humidity and rising temperatures.  Three firefighters who were injured where three others were killed near Twisp are now recovering at home, but a fourth remains in a Seattle hospital.