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Air Stagnation Advisory issued December 4 at 10:18PM PST until December 7 at 4:00AM PST by NWS Portland OR

6 months 3 weeks 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, 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.
NWS

Air Stagnation Advisory issued December 4 at 10:18PM PST until December 7 at 4:00AM PST by NWS Portland OR

6 months 3 weeks ago
* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in fog and freezing fog. 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. * WHERE...South Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Saturday. For the Freezing Fog Advisory, until 11 AM PST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous. With temperatures at or just below freezing, fog droplets may freeze on contact with surfaces, with slick spots on roadways possible overnight into early Thursday.
NWS

Freezing Fog Advisory issued December 4 at 10:18PM PST until December 5 at 11:00AM PST by NWS Portland OR

6 months 3 weeks ago
* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in fog and freezing fog. 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. * WHERE...South Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Saturday. For the Freezing Fog Advisory, until 11 AM PST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous. With temperatures at or just below freezing, fog droplets may freeze on contact with surfaces, with slick spots on roadways possible overnight into early Thursday.
NWS

Air Stagnation Advisory issued December 4 at 8:00PM PST until December 7 at 4:00AM PST by NWS Medford OR

6 months 3 weeks ago
* 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.
NWS

Air Stagnation Advisory issued December 4 at 8:00PM PST until December 7 at 4:00AM PST by NWS Medford OR

6 months 3 weeks ago
* 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 Douglas, Josephine, and Jackson County. This includes the Umpqua, Illinois, Applegate, and Rogue valleys. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Saturday. For the Dense Fog Advisory, until 1 PM PST 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 8:00PM PST until December 5 at 1:00PM PST by NWS Medford OR

6 months 3 weeks ago
* 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 Douglas, Josephine, and Jackson County. This includes the Umpqua, Illinois, Applegate, and Rogue valleys. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Saturday. For the Dense Fog Advisory, until 1 PM PST 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 7:39PM PST until December 5 at 10:00AM PST by NWS Seattle WA

6 months 3 weeks ago
* WHAT...Visibility one quarter to one half mile in areas of dense fog and localized freezing fog. * WHERE...Admiralty Inlet Area, Hood Canal Area, Western Skagit County, Western Whatcom County, Bremerton and Vicinity, Everett and Vicinity, Seattle and Vicinity, Southwest Interior, and Tacoma Area. * WHEN...Until 10 AM PST Thursday. * IMPACTS...Areas of low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Areas of sub-freezing temperatures into Thursday morning may cause localized freezing fog.
NWS

Air Stagnation Advisory issued December 4 at 5:04PM PST until December 5 at 4:00AM PST by NWS Portland OR

6 months 4 weeks 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, 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 Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.
NWS

Freezing Fog Advisory issued December 4 at 5:04PM PST until December 5 at 11:00AM PST by NWS Portland OR

6 months 4 weeks ago
* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in fog and freezing fog. 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. * WHERE...South Willamette Valley. * WHEN...For the Freezing Fog Advisory, until 11 AM PST Thursday. For the Air Stagnation Advisory, until 4 AM PST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous. With temperatures at or just below freezing, fog droplets may freeze on contact with surfaces, with slick spots on roadways possible overnight into early Thursday.
NWS

Air Stagnation Advisory issued December 4 at 5:04PM PST until December 5 at 4:00AM PST by NWS Portland OR

6 months 4 weeks ago
* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in fog and freezing fog. 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. * WHERE...South Willamette Valley. * WHEN...For the Freezing Fog Advisory, until 11 AM PST Thursday. For the Air Stagnation Advisory, until 4 AM PST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. Low visibility could make driving conditions hazardous. With temperatures at or just below freezing, fog droplets may freeze on contact with surfaces, with slick spots on roadways possible overnight into early Thursday.
NWS

Air Stagnation Advisory issued December 4 at 5:04PM PST until December 5 at 4:00AM PST by NWS Portland OR

6 months 4 weeks 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, 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 Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.
NWS

Hydrologic Outlook issued December 4 at 4:30PM PST by NWS Seattle WA

6 months 4 weeks ago
ESFSEW A stronger storm system will move though the area over much of the weekend that could produce enough rainfall to drive the Skokomish River above flood stage. There is still a fair amount of uncertainty regarding flooding since the precipitation forecasts have been quite variable from run to run. On the low end, it would not produce a flood, but on the high end minor flooding would be likely. Snow level during the storm will not be an issue since for most of the heavy precipitation, the snow level will be 7000 to 9000 feet. Please monitor the latest river forecasts from the National Weather Service for additional information.
NWS

Air Stagnation Advisory issued December 4 at 11:59AM PST until December 5 at 4:00AM PST by NWS Portland OR

6 months 4 weeks 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, 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 Thursday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.
NWS