(Hillsboro, OR)  --  Washington County fire agencies are enacting a high-fire danger burn ban starting on Monday.  It means all yard debris burning is prohibited along with agricultural burning and fires to clear land.  The ban does not stop outdoor cooking, warming or recreational fires.  Fires in fire pits are allowed as long as they have a three-foot clearance and flames are no higher than two feet.  Barbecue grills, smokers and other outdoor cooking appliance are also allowed.