.NOW... AREAS OF FOG ARE DEVELOPING ONCE AGAIN TONIGHT ACROSS PORTIONS OF THE WILLAMETTE VALLEY AND ALONG THE INTERSTATE 5 CORRIDOR IN SOUTHWEST WASHINGTON. VISIBILITY DOWN TO ONE QUARTER MILE HAS BEEN REPORTED AT SEVERAL VALLEY AIRPORTS AND ALSO LOCALLY ON AREA WEB CAMS. VISIBILITY MAY LOCALLY BE REDUCED TO LESS THAN ONE QUARTER MILE AT TIMES OVERNIGHT...BEFORE FOG GRADUALLY LIFTS TUESDAY MORNING. BE SURE TO SLOW DOWN AND DRIVE MORE CAUTIOUSLY IN FOGGY AREAS TONIGHT.