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One product issued by NWS for: Waterville WA
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Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Spokane WA
914 AM PDT Wed Oct 28 2020

WAZ037-038-041>044-301800-
/O.CON.KOTX.AS.Y.0001.000000T0000Z-201030T1800Z/
Northeast Mountains-Okanogan Highlands-Wenatchee Area-
East Slopes Northern Cascades-Okanogan Valley-Waterville Plateau-
Including the cities of 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, and Mansfield
914 AM PDT Wed Oct 28 2020

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 11 AM PDT
FRIDAY...

* WHAT...An extended period of stagnant air, with light winds
  and little vertical mixing.

* WHERE...Northeast Mountains, Okanogan Highlands, Wenatchee
  Area, East Slopes Northern Cascades, Okanogan Valley and
  Waterville Plateau.

* WHEN...Until 11 AM PDT Friday.

* IMPACTS...Periods of air stagnation can lead to the buildup of
  pollutants near the surface. This can be harmful to those
  sensitive to air pollution including people with lung and
  heart problems, people with diabetes, children, and the
  elderly.

* ADDITIONAL DETAILS...Strong inversions will linger into the
  late morning or early afternoon hours. The arrival of a cold
  front on Friday should bring increasing winds and help push
  stagnant air out of the valleys of central and northern
  Washington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If possible, reduce or eliminate activities that contribute to
air pollution, such as outdoor burning, and the use of
residential wood burning devices. Reduce vehicle trips and
vehicle idling as much as possible. Check with local agencies for
possible restriction in your area.

&&

$$




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