One product issued by NWS for: Waterville WA
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. && $$