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wwus76 kotx 281614

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

* 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 

* 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 

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.


wwus76 kpdt 291340

urgent - weather message
national weather service pendleton or
640 am pdt thu oct 29 2020

kittitas valley-yakima valley-
east slopes of the washington cascades-simcoe highlands-
including the cities of ellensburg, thorp, naches, sunnyside, 
toppenish, yakima, appleton, cle elum, cliffdell, goldendale, 
and bickleton
640 am pdt thu oct 29 2020

...air stagnation advisory remains in effect until 11 am pdt

* what...poor air quality.

* where...simcoe highlands, east slopes of the washington 
  cascades, kittitas valley and yakima valley.

* when...until 11 am pdt friday.

* impacts...poor air quality may cause issues for people with 
  respiratory problems.

precautionary/preparedness actions...

people with respiratory illness should follow their physician's
advice for dealing with high levels of air pollution during
periods of stagnant air.

state air quality agencies highly recommend that no outdoor
burning occur and that residential wood burning devices be
limited as much as possible. according to state air quality
agencies, prolonged periods of stagnant air can hold pollutants
close to the ground where people live and breathe. check with
your local burn agency for any current restrictions in your area.



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