502 WWUS76 KPDT 011811 NPWPDT URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE PENDLETON OR 1011 AM PST MON DEC 1 2008 WAZ026-012000- /O.EXP.KPDT.FG.Y.0009.000000T0000Z-081201T1800Z/ /O.CON.KPDT.AS.Y.0003.000000T0000Z-081201T2000Z/ KITTITAS VALLEY- INCLUDING THE CITY OF...ELLENSBURG 1011 AM PST MON DEC 1 2008 ...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY... ...DENSE FOG ADVISORY WILL EXPIRE AT 10 AM PST THIS MORNING... THE DENSE FOG ADVISORY WILL EXPIRE AT 10 AM PST THIS MORNING. AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY. CONDITIONS HAVE IMPROVED THIS MORNING IN THE KITTITAS VALLEY. WHILE LOCALIZED AREAS WILL SEE VISIBILITIES DOWN TO ONE HALF MILE IN FOG THROUGH THE REMAINDER OF THE MORNING...DENSE FOG IS NO LONGER WIDESPREAD. THEREFORE THE DENSE FOG ADVISORY WILL BE ALLOWED TO EXPIRE. STRONG TEMPERATURE INVERSIONS IN THE LOWER LEVELS HAVE RESULTED IN MIXING HEIGHTS BELOW 1500 FEET. RELATIVELY LIGHT WINDS AND A LACK OF MIXING WILL RESULT IN POLLUTANTS BEING TRAPPED NEAR THE GROUND. A PACIFIC WEATHER SYSTEM WILL BRING A SLIGHT INCREASE IN WINDS LATER THIS AFTERNOON WHICH WILL ENABLE BETTER MIXING...AND HELP TO IMPROVE AIR QUALITY. AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT OF AN AIRMASS ACROSS THE ADVISORY AREA...POLLUTION WILL INCREASE. CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE RESTRICTIONS IN YOUR AREA. FOR ADDITIONAL WEATHER INFORMATION... CHECK OUR WEBSITE AT WWW.WEATHER.GOV/PENDLETON. $$ ORZ501-WAZ029-012000- /O.EXT.KPDT.FG.Y.0009.000000T0000Z-081201T2000Z/ /O.CON.KPDT.AS.Y.0003.000000T0000Z-081201T2000Z/ FOOTHILLS OF THE BLUE MOUNTAINS OF OREGON- FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON- INCLUDING THE CITIES OF...HEPPNER...PENDLETON...DAYTON... WAITSBURG...WALLA WALLA 1011 AM PST MON DEC 1 2008 ...DENSE FOG ADVISORY NOW IN EFFECT UNTIL NOON PST TODAY... ...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY... THE DENSE FOG ADVISORY IS NOW IN EFFECT UNTIL NOON PST TODAY. AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY. AREAS OF DENSE FOG CONTINUE IN THE FOOTHILLS OF THE BLUE MOUNTAINS. VISIBILITIES WILL BE ONE QUARTER MILE OR LESS AT TIMES THIS MORNING. A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN... USE LOW BEAM HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU. FOR ADDITIONAL WEATHER INFORMATION...CHECK OUR WEB SITE AT WWW.WEATHER.GOV/PENDLETON. STRONG TEMPERATURE INVERSIONS IN THE LOWER LEVELS HAVE RESULTED IN MIXING HEIGHTS BELOW 1500 FEET. RELATIVELY LIGHT WINDS AND A LACK OF MIXING WILL RESULT IN POLLUTANTS BEING TRAPPED NEAR THE GROUND. A PACIFIC WEATHER SYSTEM WILL BRING A SLIGHT INCREASE IN WINDS LATER THIS AFTERNOON WHICH WILL ENABLE BETTER MIXING...AND HELP TO IMPROVE AIR QUALITY. AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT OF AN AIRMASS ACROSS THE ADVISORY AREA...POLLUTION WILL INCREASE. CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE RESTRICTIONS IN YOUR AREA. FOR ADDITIONAL WEATHER INFORMATION... CHECK OUR WEBSITE AT WWW.WEATHER.GOV/PENDLETON. $$ WAZ027-020215- /O.EXT.KPDT.AS.Y.0003.000000T0000Z-081202T2300Z/ YAKIMA VALLEY- INCLUDING THE CITIES OF...SUNNYSIDE...YAKIMA 1011 AM PST MON DEC 1 2008 ...AIR STAGNATION ADVISORY NOW IN EFFECT UNTIL 3 PM PST TUESDAY... THE AIR STAGNATION ADVISORY IS NOW IN EFFECT UNTIL 3 PM PST TUESDAY. STRONG TEMPERATURE INVERSIONS IN THE LOWER LEVELS CONTINUE TO KEEP MIXING HEIGHTS BELOW 1500 FEET TODAY. WINDS WILL REMAIN LIGHT TODAY AND OVERNIGHT...LIMITING MIXING AND KEEPING POLLUTANTS TRAPPED NEAR THE GROUND IN THE YAKIMA VALLEY. COLDER AIR MOVING IN BEHIND A DEPARTING WEATHER DISTURBANCE TOMORROW WILL HELP WEAKEN THE INVERSION AND ALLOW FOR BETTER MIXING AND IMPROVED AIR QUALITY BY THE AFTERNOON. AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT OF AN AIRMASS ACROSS THE ADVISORY AREA...POLLUTION WILL INCREASE. CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE RESTRICTIONS IN YOUR AREA. FOR ADDITIONAL WEATHER INFORMATION... CHECK OUR WEBSITE AT WWW.WEATHER.GOV/PENDLETON. $$ ORZ041-042-044-504-WAZ024-028-502-012000- /O.CON.KPDT.AS.Y.0003.000000T0000Z-081201T2000Z/ EASTERN COLUMBIA RIVER GORGE OF OREGON-NORTH CENTRAL OREGON- LOWER COLUMBIA BASIN OF OREGON- NORTHERN WHEELER AND SOUTHERN GILLIAM COUNTIES- EASTERN COLUMBIA RIVER GORGE OF WASHINGTON- LOWER COLUMBIA BASIN OF WASHINGTON- EAST SLOPES OF THE SOUTHERN CASCADES OF WASHINGTON- INCLUDING THE CITIES OF...THE DALLES...DUFUR...MADRAS...MAUPIN... MORO...ARLINGTON...BOARDMAN...HERMISTON...CONDON...FOSSIL... SPRAY...WHITE SALMON...CONNELL...PROSSER...TRI-CITIES... GOLDENDALE...APPLETON...TROUT LAKE...BICKLETON 1011 AM PST MON DEC 1 2008 ...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY... AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY. STRONG TEMPERATURE INVERSIONS IN THE LOWER LEVELS HAVE RESULTED IN MIXING HEIGHTS BELOW 1500 FEET. RELATIVELY LIGHT WINDS AND A LACK OF MIXING WILL RESULT IN POLLUTANTS BEING TRAPPED NEAR THE GROUND. A PACIFIC WEATHER SYSTEM WILL BRING A SLIGHT INCREASE IN WINDS LATER THIS AFTERNOON WHICH WILL ENABLE BETTER MIXING...AND HELP TO IMPROVE AIR QUALITY. AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT OF AN AIRMASS ACROSS THE ADVISORY AREA...POLLUTION WILL INCREASE. CHECK WITH YOUR LOCAL AIR QUALITY AGENCY FOR POSSIBLE RESTRICTIONS IN YOUR AREA. FOR ADDITIONAL WEATHER INFORMATION... CHECK OUR WEBSITE AT WWW.WEATHER.GOV/PENDLETON. $$