Air Stagnation Advisory issued December 5 at 2:58PM PST until December 7 at 4:00AM PST by NWS Medford OR
* WHAT...A ridge of high pressure will lead to a strong inversion and stagnant air conditions near the surface that will continue to trap pollutants. This could worsen air quality over time. * WHERE...Valley locations across southern Oregon. West of the Cascades, this includes the Umpqua, Illinois, Applegate, and Rogue valleys. East of the Cascades, this includes Klamath Falls, Sprague River, Chiloquin, Chemult, Silver Lake, Paisley, and surrounding areas. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Low visibility could make driving conditions hazardous. Watch for icy spots on roads. Poor air quality may cause issues for people with respiratory problems.
Air Stagnation Advisory issued December 6 at 1:25AM MST until December 7 at 5:00PM MST by NWS Boise ID
* WHAT...An extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants in valleys. * WHERE...Portions of south central, southwest, and west central Idaho and northeast and southeast Oregon. * WHEN...Until 5 PM MST /4 PM PST/ Saturday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.
Air Stagnation Advisory issued December 4 at 10:18PM PST until December 7 at 4:00AM PST by NWS Portland OR
* WHAT...Light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...Foothills of the Northern and Central Oregon Cascades, North and Central Coast Range Valleys of Oregon, Lower Columbia River and Cowlitz River Valleys, Central Willamette Valley, Tualatin Valley, Outer Southeast Portland Metro, Willapa and Wahkiakum Lowlands, North Clark County Lowlands, and South Washington Cascade Foothills. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.
Air Stagnation Advisory issued December 4 at 8:00PM PST until December 7 at 4:00AM PST by NWS Medford OR
* WHAT...Valley locations may see poor air quality. This is due to an inversion and stagnant air conditions near the surface that will continue to trap pollutants. * WHERE...Valleys in central and northern Lake County and Klamath County. This includes Klamath Falls, Sprague River, Chiloquin, Chemult, Silver Lake, Paisley and surrounding areas. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.
Air Stagnation Advisory issued December 4 at 9:16AM MST until December 7 at 5:00PM MST by NWS Boise ID
* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory in valleys, an extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants. * WHERE...Treasure Valley Zones. * WHEN...For the Dense Fog Advisory, until 2 PM MST Friday. For the Air Stagnation Advisory, until 5 PM MST Saturday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Fog could produce patchy
Air Stagnation Advisory issued December 3 at 11:23PM PST until December 6 at 4:00PM PST by NWS Medford OR
* WHAT...A ridge of high pressure will lead to a strong inversion and stagnant air conditions near the surface that will continue to trap pollutants. This could worsen air quality over time. * WHERE...Valley locations across southern Oregon. West of the Cascades, this includes the Umpqua, Illinois, Applegate, and Rogue valleys. East of the Cascades, this includes Klamath Falls, Sprague River, Chiloquin, Chemult, Silver Lake, Paisley, and surrounding areas. * WHEN...Until 4 PM PST Friday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.
Air Stagnation Advisory issued December 3 at 5:08PM PST until December 5 at 4:00AM PST by NWS Portland OR
* WHAT...Light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...Foothills of the Northern and Central Oregon Cascades, North and Central Coast Range Valleys of Oregon, Lower Columbia River and Cowlitz River Valleys, Tualatin Valley, Outer Southeast Portland Metro, Willapa and Wahkiakum Lowlands, North Clark County Lowlands, and South Washington Cascade Foothills. * WHEN...Until 4 AM PST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.
Air Stagnation Advisory issued December 3 at 6:38PM MST until December 7 at 5:00PM MST by NWS Boise ID
* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory in valleys, an extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants. * WHERE...Upper Treasure Valley. * WHEN...For the Dense Fog Advisory, until noon MST Wednesday. For the Air Stagnation Advisory, until 5 PM MST Saturday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.
Air Stagnation Advisory issued December 2 at 8:14PM PST until December 5 at 4:00AM PST by NWS Portland OR
* WHAT...Light winds and limited air movement will lead to a period of stagnant air conditions. This scenario could result in the build up of air pollutants over time. * WHERE...Foothills of the Northern and Central Oregon Cascades, North and Central Coast Range Valleys of Oregon, Lower Columbia River and Cowlitz River Valleys, Tualatin Valley, Outer Southeast Portland Metro, Willapa and Wahkiakum Lowlands, North Clark County Lowlands, and South Washington Cascade Foothills. * WHEN...Until 4 AM PST Thursday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.
Air Stagnation Advisory issued December 2 at 4:53PM MST until December 6 at 9:00PM MST by NWS Boise ID
* WHAT...For the Dense Fog Advisory, visibility a quarter mile or less in dense fog is expected for the Tuesday morning. For the Air Stagnation Advisory in valleys, an extended period of stagnant air, with light winds and little vertical mixing. This is due to an inversion near the surface that will continue to trap pollutants. * WHERE...Treasure Valley Zones. * WHEN...For the Dense Fog Advisory, until 11 AM MST Tuesday. For the Air Stagnation Advisory, until 9 PM MST Friday. * IMPACTS...Low visibility could make driving conditions hazardous especially for the morning commute between Ontario, Oregon and Mountain Home.