AIR STAGNATION ADVISORY FOR: Eastern Columbia River Gorge of Washington Foothills of the Blue Mountains of Washington Kittitas Valley Lower Columbia Basin of Washington Simcoe Highlands Yakima Valley ...STAGNANT CONDITIONS EXPECTED THROUGH THE WEEK... .A RIDGE OF HIGH PRESSURE ALOFT WILL REMAIN NEARLY STATIONARY OVER THE AREA THROUGH TUESDAY THEN SHIFT WEST TO OFF THE COAST ON WEDNESDAY. THIS WILL HELP WEAKEN THE TEMPERATURE INVERSION WEDNESDAY THROUGH FRIDAY. HOWEVER...THE WEAKENED INVERSION WILL STILL TRAP POLLUTANTS NEAR THE SURFACE. PATCHY DENSE FOG OR FREEZING FOG WILL ALSO BE POSSIBLE AT TIMES DURING THIS PERIOD. ...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST FRIDAY... AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST FRIDAY. * TIMING: THE AIR STAGNATION ADVISORY WILL CONTINUE THROUGH THE WEEK. THERE COULD BE SOME RELIEF MIDWEEK AS A WEAK WEATHER SYSTEMS PASSES OVER THE REGION BUT OVERALL THE INVERSION IS EXPECTED TO REMAIN IN PLACE BUT BE WEAKER AFTER WEDNESDAY. OCCASIONAL BREEZY WINDS MAY BRIEFLY IMPROVE CONDITIONS AT THE SOUTH END OF THE GRANDE RONDE VALLEY IN OREGON. * IMPACTS: POLLUTION NEAR THE GROUND WILL CONTINUE TO BE TRAPPED BY THE INVERSION...RESULTING IN DEGRADED AIR QUALITY. AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT OF AN AIR MASS 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.
Posted on: Tue, 21 Jan 2014 02:40:31 +0000