000 WWUS75 KMSO 221214 NPWMSO URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MISSOULA MT 515 AM MST MON DEC 22 2003 MTZ001-003>005-043-221800- KOOTENAI/CABINET REGION-FLATHEAD/MISSION VALLEYS- LOWER CLARK FORK REGION-MISSOULA/BITTERROOT VALLEYS-BLACKFOOT REGION- INCLUDING...DRUMMOND...SEELEY LAKE...HAMILTON...DARBY...KALISPELL... POLSON...ST. IGNATIUS...LIBBY...EUREKA...NOXON...THOMPSON FALLS... SUPERIOR ...DENSE FOG ADVISORY CONTINUES FOR THE VALLEYS OF NORTHWEST AND WEST CENTRAL MONTANA THROUGH 11 AM TODAY... LOCAL REPORTS FROM DISPATCH AND AIRPORT OBSERVATIONS INDICATE DENSE FOG IS REDUCING VISIBILITIES TO ONE QUARTER MILE OR LESS ACROSS MOST VALLEYS OF NORTHWEST AND WEST CENTRAL MONTANA. DENSE FOG IS EXPECTED TO CONTINUE THROUGH THE MORNING HOURS...THEREFORE A DENSE FOG ADVISORY CONTINUES THROUGH 11 AM. MANY TEMPERATURES ARE AT OR BELOW FREEZING SO AREAS OF BLACK ICE ARE POSSIBLE. MOTORISTS SHOULD USE EXTREME CAUTION...REDUCE SPEEDS AND ALLOW EXTRA TIME TO REACH DESTINATIONS AND PLENTY OF SPACE BETWEEN VEHICLES. $$