The National Weather Service in Norman has issued a Cold Weather Advisory for a majority of the state this weekend. The only counties not in the Cold Weather Advisory are three counties within the Oklahoma panhandle. The Cold Weather Advisory is set to go into effect at midnight Friday and will last through 11 a.m. Saturday. National Weather Service in Norman National Weather Service in Norman loading... National Weather Service in Norman National Weather Service in Norman loading...Oklahoma Cold Weather Checklist Those first big cold fronts always seem to catch Oklahoma by surprise.