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One product issued by NWS for:

Air Stagnation Advisory

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.

&&

$$




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