weather.gov     
National Weather Service

Watches, Warnings & Advisories
NWS Homepage

Air Stagnation Advisory


URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE PENDLETON OR
1011 AM PST WED DEC 17 2014

...STAGNANT CONDITIONS TO CONTINUE THROUGH THE WEEK...

.INVERSIONS WILL RESULT IN STAGNANT CONDITIONS WITH LOW CLOUDS
AND DENSE FOG AT TIMES.

WAZ026>028-181800-
/O.CON.KPDT.AS.Y.0004.000000T0000Z-141219T1800Z/
KITTITAS VALLEY-YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
INCLUDING THE CITIES OF...ELLENSBURG...THORP...NACHES...
SUNNYSIDE...TOPPENISH...YAKIMA...CONNELL...PROSSER...TRI-CITIES
1011 AM PST WED DEC 17 2014

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
FRIDAY...

AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
FRIDAY.

* TIMING: THROUGH AT LEAST MIDDAY FRIDAY.

* LOCATIONS: VALLEYS IN AND AROUND THE LOWER COLUMBIA BASIN OF
  WASHINGTON INCLUDING THE YAKIMA AND KITTITAS VALLEYS

* IMPACTS: POLLUTANTS TRAPPED NEAR THE SURFACE CAN NEGATIVELY
  AFFECT THOSE WITH RESPIRATORY CONDITIONS.

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
942 AM PST WED DEC 17 2014

..LIGHT WINDS AND INVERSIONS WILL PERSIST THROUGH MUCH OF THE
WORKWEEK. THIS WILL LEAD TOWARD STAGNANT AIR CONDITIONS OVER MUCH
OF CENTRAL AND NORTHEAST WASHINGTON.

WAZ034-035-037-038-041>044-181745-
/O.CON.KOTX.AS.Y.0004.000000T0000Z-141219T2000Z/
MOSES LAKE AREA-UPPER COLUMBIA BASIN-NORTHEAST MOUNTAINS-
OKANOGAN HIGHLANDS-WENATCHEE AREA-EAST SLOPES NORTHERN CASCADES-
OKANOGAN VALLEY-WATERVILLE PLATEAU-
942 AM PST WED DEC 17 2014

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON PST
FRIDAY...

* AIR QUALITY...LIGHT WINDS AND STABLE CONDITIONS WILL INCREASE
  THE POTENTIAL FOR BUILD UP OF POLLUTANTS NEAR THE SURFACE.

* TIMING...HIGH PRESSURE WILL PERSIST THROUGH FRIDAY MORNING.

* IMPACTS...PROLONGED PERIODS OF STAGNANT AIR CAN LOCK FINE
  PARTICULATE MATTER CLOSE TO THE GROUND AND DEGRADE AIR QUALITY.

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. PERSONS WITH
RESPIRATORY ILLNESS SHOULD FOLLOW THEIR PHYSICIANS ADVICE FOR
DEALING WITH HIGH LEVELS OF AIR POLLUTION.

&&

$$

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE