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Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Spokane WA
1053 AM PST Sat Dec 5 2020

WAZ034>036-043-060900-
/O.EXP.KOTX.FG.Y.0005.000000T0000Z-201205T1900Z/
/O.CON.KOTX.AS.Y.0003.000000T0000Z-201208T1800Z/
Moses Lake Area-Upper Columbia Basin-Spokane Area-Okanogan Valley-
Including the cities of Moses Lake, Ephrata, Othello, Quincy,
Ritzville, Grand Coulee, Odessa, Wilbur, Coulee City, Spokane,
Cheney, Davenport, Rockford, Omak, Okanogan, Brewster,
Bridgeport, Oroville, and Nespelem
1053 AM PST Sat Dec 5 2020

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
TUESDAY...
...DENSE FOG ADVISORY WILL EXPIRE AT 11 AM PST THIS MORNING...

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

* WHERE...Moses Lake Area, Upper Columbia Basin, Spokane Area
  and Okanogan Valley. More specifically...the West Plains of
  Spokane, North Spokane, Highway 26 from Royal City to
  Washtucna, along the Columbia River from Grand Coulee to
  Bridgeport and along Highway 97 from Mallott to Omak.

* WHEN...Air Stagnation Advisory until 10 AM PST Tuesday. The
  Dense Fog Advisory will expire at 11 AM PST Saturday.

* 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...Low visibility due to fog will persist
  through early afternoon with improving visibilities. Driving
  conditions may change rapidly with changing conditions. Roads
  may be slick in the freezing fog.

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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