Washington wildfires: Old Trails fire, evacuations, air quality alerts

Old Trails fire has destroyed 640 structures, 60k evacuated. Arson suspect arrested in Chelan Hills; Spokane arsonist admits to 25 fires. Air Quality Alerts across Puget Sound, expanded to Whatcom/Skagit. Lightning sparks new fires. Federal emergency declared. Pinpoint Alert for Saturday thunderstorm threat.