Spokane County Sheriff Ozzie Knezovich may very well cancel school tomorrow. He's holding a press conference this afternoon. I'll post after he's done (I think the press conference is at 4:30, so I'll try to post soon after that.) Here's the Spokesman blurb about it.
Central Valley, West Valley, Nine Mile Falls, Medical Lake, Liberty, Mead, East Valley, Freeman, Great Northern, Orchard Prairie and Spokane districts will comply. Cheney and Riverside districts already had made the decision to close for the day. In Lincoln County, the Reardan-Edwall School District will be closed.
Update: He has 'strongly recommended' the closure of all schools in Sookane County for tomorrow, and officials are checking if he can order the schools closed. The link above is still good, and the grey box above shows school closures as told in that Spokesman story. Prep and St. Georges are closed, also.