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NOAA Current Watches-OR

Air Stagnation Advisory issued December 4 at 2:36AM PST until December 5 at 4:00AM PST by NWS Portland OR

2 weeks 5 days ago
* WHAT...For the Air Stagnation Advisory, 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. For the Freezing Fog Advisory, areas of fog and freezing fog, with visibility one quarter mile or less at times. * WHERE...Central and Southern Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday. For the Freezing Fog Advisory, until noon PST today. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous. With freezing temperatures, moisture in the fog could freeze on bridges and overpasses, making slick and icy spots.
NWS

Air Stagnation Advisory issued December 4 at 2:36AM PST until December 5 at 4:00AM PST by NWS Portland OR

2 weeks 5 days ago
* 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.
NWS

Freezing Fog Advisory issued December 4 at 2:36AM PST until December 4 at 12:00PM PST by NWS Portland OR

2 weeks 5 days ago
* WHAT...For the Air Stagnation Advisory, 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. For the Freezing Fog Advisory, areas of fog and freezing fog, with visibility one quarter mile or less at times. * WHERE...Central and Southern Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday. For the Freezing Fog Advisory, until noon PST today. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous. With freezing temperatures, moisture in the fog could freeze on bridges and overpasses, making slick and icy spots.
NWS

Air Stagnation Advisory issued December 4 at 3:05AM MST until December 7 at 5:00PM MST by NWS Boise ID

2 weeks 5 days ago
* 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.
NWS

Air Stagnation Advisory issued December 4 at 3:05AM MST until December 7 at 5:00PM MST by NWS Boise ID

2 weeks 5 days ago
* WHAT...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. For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. * WHERE...Lower Treasure Valley Zones. * WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday. For the Dense Fog Advisory, until 2 PM MST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.
NWS

Dense Fog Advisory issued December 4 at 3:05AM MST until December 5 at 2:00PM MST by NWS Boise ID

2 weeks 5 days ago
* WHAT...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. For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. * WHERE...Lower Treasure Valley Zones. * WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday. For the Dense Fog Advisory, until 2 PM MST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.
NWS

Air Stagnation Advisory issued December 3 at 11:23PM PST until December 6 at 4:00PM PST by NWS Medford OR

2 weeks 5 days ago
* 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.
NWS

Air Stagnation Advisory issued December 3 at 6:38PM MST until December 7 at 5:00PM MST by NWS Boise ID

2 weeks 5 days ago
* 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.
NWS

Air Stagnation Advisory issued December 3 at 6:38PM MST until December 7 at 5:00PM MST by NWS Boise ID

2 weeks 5 days ago
* WHAT...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. For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. * WHERE...Lower Treasure Valley Zones. * WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday. For the Dense Fog Advisory, until 2 PM MST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.
NWS

Dense Fog Advisory issued December 3 at 6:38PM MST until December 5 at 2:00PM MST by NWS Boise ID

2 weeks 5 days ago
* WHAT...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. For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. * WHERE...Lower Treasure Valley Zones. * WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday. For the Dense Fog Advisory, until 2 PM MST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous.
NWS

Air Stagnation Advisory issued December 3 at 5:08PM PST until December 5 at 4:00AM PST by NWS Portland OR

2 weeks 5 days ago
* 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.
NWS

Air Stagnation Advisory issued December 3 at 5:08PM PST until December 5 at 4:00AM PST by NWS Portland OR

2 weeks 5 days ago
* WHAT...For the Freezing Fog Advisory, areas of fog and freezing fog, with visibility one quarter mile or less. For the Air Stagnation Advisory, poor air quality will continue. This is due to an inversion and stagnant air conditions near the surface that will continue to trap pollutants. * WHERE...Central and Southern Willamette Valley. * WHEN...For the Freezing Fog Advisory, until noon PST Wednesday. For the Air Stagnation Advisory, until 4 AM PST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Fog will be reforming this evening. Low visibility could make driving conditions hazardous. With freezing temperatures, moisture in the fog could freeze on bridges and overpasses, making slick and icy spots.
NWS

Freezing Fog Advisory issued December 3 at 5:08PM PST until December 4 at 12:00PM PST by NWS Portland OR

2 weeks 5 days ago
* WHAT...For the Freezing Fog Advisory, areas of fog and freezing fog, with visibility one quarter mile or less. For the Air Stagnation Advisory, poor air quality will continue. This is due to an inversion and stagnant air conditions near the surface that will continue to trap pollutants. * WHERE...Central and Southern Willamette Valley. * WHEN...For the Freezing Fog Advisory, until noon PST Wednesday. For the Air Stagnation Advisory, until 4 AM PST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Fog will be reforming this evening. Low visibility could make driving conditions hazardous. With freezing temperatures, moisture in the fog could freeze on bridges and overpasses, making slick and icy spots.
NWS
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