URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE PENDLETON OR
351 AM PST MON FEB 6 2012
...DENSE FREEZING FOG OVER PORTIONS OF SOUTHEAST WASHINGTON AND
CENTRAL AND NORTHEAST OREGON THROUGH THIS MORNING...
...POOR AIR QUALITY THROUGH AT LEAST TUESDAY MORNING...
.HIGH PRESSURE OVER THE REGION ALONG WITH RELATIVELY LIGHT WINDS
WILL LIMIT THE AMOUNT OF DISPERSION OF POLLUTANTS NEAR THE
GROUND. THESE CONDITIONS MAY BRIEFLY IMPROVE EACH AFTERNOON.
WEATHER MODELS INDICATE THE POSSIBILITY FOR AIR QUALITY
IMPROVEMENT TUESDAY...BUT THERE IS A POTENTIAL FOR STAGNANT
CONDITIONS THROUGH MOST OF THIS WEEK. STRONG INVERSIONS ARE ALSO
RESULTING IN AREAS OF FOG AND LOW CLOUDS. DENSE FREEZING FOG WILL
OCCUR THIS MORNING IN THE LOWER ELEVATIONS OF CENTRAL AND
NORTHEAST OREGON AND SOUTHEAST WASHINGTON.
ORZ050-505-508-WAZ026-027-061900-
/O.CON.KPDT.AS.Y.0002.000000T0000Z-120207T1800Z/
WALLOWA COUNTY-JOHN DAY BASIN-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
KITTITAS VALLEY-YAKIMA VALLEY-
INCLUDING THE CITIES OF...ENTERPRISE...JOSEPH...WALLOWA...
DAYVILLE...JOHN DAY...MITCHELL...MONUMENT...SPRAY...HEPPNER...
CONDON...FOSSIL...ELLENSBURG...THORP...NACHES...SUNNYSIDE...
TOPPENISH...YAKIMA
351 AM PST MON FEB 6 2012
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
TUESDAY...
AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
TUESDAY.
* TIMING: FOR STAGNANT CONDITIONS...THROUGH AT LEAST TUESDAY
MORNING.
* LOCATIONS: MOST LOWER ELEVATIONS AND VALLEYS OF NORTHEAST
OREGON AND SOUTHEAST WASHINGTON.
* IMPACTS: AIR QUALITY WILL DECREASE OVER TIME. PEOPLE
SENSITIVE TO AIR QUALITY ISSUES SHOULD TAKE PRECAUTIONS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SPOKANE WA
1056 AM PST SUN FEB 5 2012
...PROLONGED PERIOD OF AIR STAGNATION THROUGH NEXT WEEK...
.STRONG HIGH PRESSURE WILL REMAIN OVER THE INLAND NORTHWEST
THROUGH AT LEAST NEXT TUESDAY. SEVERAL DAYS OF VERY LIGHT WINDS
ARE EXPECTED CONTRIBUTING TO THE POTENTIAL FOR AIR STAGNATION IN
THE VALLEYS OF NORTHERN WASHINGTON AND OVER MUCH OF CENTRAL
WASHINGTON.
WAZ034-035-037-038-041>044-061900-
/O.CON.KOTX.AS.Y.0002.000000T0000Z-120207T1800Z/
MOSES LAKE AREA-UPPER COLUMBIA BASIN-NORTHEAST MOUNTAINS-
OKANOGAN HIGHLANDS-WENATCHEE AREA-EAST SLOPES NORTHERN CASCADES-
OKANOGAN VALLEY-WATERVILLE PLATEAU-
INCLUDING THE CITIES OF...MOSES LAKE...EPHRATA...OTHELLO...
QUINCY...GRAND COULEE...WILBUR...COULEE CITY...COLVILLE...
DEER PARK...CHEWELAH...NEWPORT...KETTLE FALLS...REPUBLIC...
INCHELIUM...WAUCONDA...WENATCHEE...CHELAN...ENTIAT...CASHMERE...
LEAVENWORTH...MAZAMA...TWISP...WINTHROP...STEHEKIN...CONCONULLY...
OMAK...OKANOGAN...BREWSTER...BRIDGEPORT...OROVILLE...NESPELEM...
WATERVILLE...MANSFIELD
1056 AM PST SUN FEB 5 2012
...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
TUESDAY BELOW 4000 FEET...
AN AIR STAGNATION ADVISORY BELOW 4000 FEET REMAINS IN EFFECT
UNTIL 10 AM PST TUESDAY.
* TIMING: THROUGH AT LEAST TUESDAY MORNING.
* LOCATIONS INCLUDE: VALLEYS OF THE EAST SLOPES OF THE CASCADES
INCLUDING LEAVENWORTH...WINTRHOP...AND THE LAKE CHELAN AREA.
MUCH OF CENTRAL AND NORTH CENTRAL WASHINGTON INCLUDING
WENATCHEE...WATERVILLE...REPUBLIC AND OMAK. THE VALLEYS OF
THE NORTHEAST WASHINGTON MOUNTAINS INCLUDING COLVILLE...
CHEWELAH...AND CUSICK.
* IMPACTS: AIR QUALITY WILL LIKELY DECREASE THROUGH THE WEEKEND
INTO EARLY NEXT WEEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION HAS THE
POTENTIAL TO INCREASE TO DANGEROUS LEVELS. PLEASE CHECK WITH YOU
LOCAL AIR QUALITY AGENCY FOR POSSIBLE RESTRICTIONS IN YOUR AREA.
&&
$$
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
500 AM PST MON FEB 6 2012
ORZ041-042-044-049-050-502-503-505>509-WAZ024-026>030-520-521-
071215-
EASTERN COLUMBIA RIVER GORGE OF OREGON-NORTH CENTRAL OREGON-
LOWER COLUMBIA BASIN OF OREGON-GRANDE RONDE VALLEY-WALLOWA COUNTY-
NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-JOHN DAY BASIN-OCHOCO-
JOHN DAY HIGHLANDS-
FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
EAST SLOPES OF THE OREGON CASCADES-
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-KITTITAS VALLEY-
YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-
NORTHWEST BLUE MOUNTAINS OF WASHINGTON-
EAST SLOPES OF THE WASHINGTON CASCADES-SIMCOE HIGHLANDS-
500 AM PST MON FEB 6 2012
THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.
.DAY ONE...TODAY AND TONIGHT
DENSE FOG
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON, LOWER COLUMBIA
BASIN OF WASHINGTON, FOOTHILLS OF THE BLUE MOUNTAINS OF
WASHINGTON, EASTERN COLUMBIA RIVER GORGE OF OREGON, NORTH
CENTRAL OREGON, EAST SLOPES OF THE OREGON CASCADES, LOWER
COLUMBIA BASIN OF OREGON, FOOTHILLS OF THE NORTHERN BLUE
MOUNTAINS OF OREGON
FREEZING FOG WILL PERSIST AGAIN THIS MORNING ACROSS THE AREAS LISTED
ABOVE. THERE WILL BE LOCAL DENSE FREEZING FOG WITH VISIBILITIES LESS
THAN A QUARTER MILE AT TIMES IN THESE AREAS AS WELL. FOG DROPLETS
WILL FREEZE ON ROADWAYS AND OTHER SURFACES CREATING SLICK
CONDITIONS. A FREEZING FOG ADVISORY IS IN EFFECT UNTIL 11 AM THIS
MORNING FOR THESE LOCATIONS. PLEASE REFER TO NWS HAZARD PRODUCT ID
PDXNPWPDT FOR MORE DETAILS.
HIGH PRESSURE ALOFT WILL CONTINUE TO PRODUCE LIGHT SURFACE WINDS AND
STRONG LOW LEVEL TEMPERATURE INVERSIONS THROUGH TONIGHT. THIS WILL
RESULT IN CONTINUED POOR MIXING AND STAGNANT AIR CONDITIONS. AN AIR
STAGNATION ADVISORY REMAINS IN EFFECT THROUGH AT LEAST TUESDAY
MORNING FOR MUCH OF THE FORECAST AREA. PLEASE REFER TO NWS HAZARD
PRODUCT ID PDXNPWPDT FOR MORE DETAILS. FAIR CONDITIONS WILL CONTINUE
IN THE MOUNTAINS ABOVE THE LOW LEVEL TEMPERATURE INVERSIONS.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.
THE AIR STAGNATION ADVISORY WILL CONTINUE THROUGH AT LEAST TUESDAY
MORNING AND MAY BE EXTENDED BEYOND TUESDAY MORNING IF THE STAGNANT
CONDITIONS DO NOT IMPROVE MUCH OR AT ALL. A WEAKENING PACIFIC WEATHER
SYSTEM WILL MOVE INTO THE REGION AND MAY HELP TO MIX OUT THE TRAPPED
POLLUTANTS UNDER THE LOW LEVEL TEMPERATURE INVERSIONS AS THE PACIFIC
WEATHER SYSTEM WEAKENS THESE INVERSIONS. HOWEVER...IT IS UNLIKELY
THAT THE STAGNANT AIR WILL COMPLETELY MIX OUT SINCE THIS WILL BE A
WEAK WEATHER SYSTEM WITH VERY LITTLE WIND EXPECTED TO BE WITH IT. IN
ADDITION THERE MAY BE AREAS OF FREEZING FOG AND/OR LOW CLOUDS AGAIN
DURING THE LATE NIGHT AND MORNING HOURS EACH DAY THIS WEEK WITH
POSSIBLE ADDITIONAL FREEZING FOG ADVISORIES ISSUED.
PERIODS OF VERY LIGHT RAIN OR SNOW MAY OCCUR ALONG THE CASCADE EAST
SLOPES AND IN THE NORTHEAST MOUNTAINS AS THE WEATHER SYSTEM CROSSES
THE REGION TUESDAY AND WEDNESDAY...AND THEN ANOTHER WEATHER SYSTEM
POSSIBLY BY NEXT WEEKEND.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
GRAPHICAL FORECASTS OF WEATHER HAZARDS OUT TO SEVEN DAYS
ARE DISPLAYED ON THE WORLD WIDE WEB AT:
WWW.WRH.NOAA.GOV/PDT/CURRENTHAZARDS/HWO.HTML
ALL LETTERS IN THE ABOVE URL ARE LOWER CASE.
$$
