Aggregator

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portland Metro Hills, Tualatin Valley, Cascade Foothills of Marion and Linn Counties, and North Clark County Lowlands. * WHEN...Until 1 PM PST this afternoon. * IMPACTS...Low visibility could make driving conditions hazardous.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Harrington, Wilbur, Creston, Ritzville, Coulee City, Grand Coulee, and Odessa. * WHEN...Until 10 AM PST this morning. * IMPACTS...Low visibility will make driving conditions hazardous. Freezing temperatures could lead to slick conditions on untreated roadways.

* WHAT...Visibility one quarter mile or less in freezing fog. * WHERE...Foothills of the Northern Blue Mountains of Oregon. * WHEN...Until 11 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous.

* WHAT...Light winds and limited air movement will lead to a period of stagnant air conditions. * WHERE...Central Willamette Valley. * WHEN...Until 10 AM PST Friday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.

* WHAT...For the Air Stagnation Advisory, light winds and limited air movement will lead to a period of stagnant air conditions. For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. * WHERE...South Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 10 AM PST Friday. For the Dense Fog Advisory, until 10 AM PST this morning. * IMPACTS...For the Dense Fog Advisory, low visibility could make driving conditions hazardous. For the Air Stagnation Advisory, deteriorating air quality may cause issues for people with respiratory problems.

* WHAT...For the Air Stagnation Advisory, light winds and limited air movement will lead to a period of stagnant air conditions. For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. * WHERE...South Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 10 AM PST Friday. For the Dense Fog Advisory, until 10 AM PST this morning. * IMPACTS...For the Dense Fog Advisory, low visibility could make driving conditions hazardous. For the Air Stagnation Advisory, deteriorating air quality may cause issues for people with respiratory problems.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Lane County Cascade Foothills. * WHEN...Until 10 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous.

* WHAT...A moderate risk of sneaker waves is expected. * WHERE...Beaches along Curry, Coos, and Douglas Counties. The highest risks will be to west-facing beaches. * WHEN...From Saturday afternoon through Sunday afternoon. * IMPACTS...Sneaker waves can run up significantly farther on beaches than normal, including over rocks and jetties. These waves can suddenly knock people off of their feet and quickly pull them into the cold ocean waters, resulting in serious injury or death. Waves may also lift driftwood logs, trapping anyone caught underneath. * View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory, moderate air quality will continue. This is due to an inversion and stagnant air conditions near the surface that will continue to trap pollutants. * WHERE...Valleys in central Douglas County. This includes Roseburg, Sutherlin, Elkton, Camas Valley, Canyonville, Glendale and surrounding areas. * WHEN...For the Air Stagnation Advisory, until noon PST Friday. For the Dense Fog Advisory, until 10 AM PST this morning. * IMPACTS...Moderate air quality may cause issues for people with respiratory problems. * ADDITIONAL DETAILS...Strong valley inversions, very shallow mixing layers of less than 1000 feet, and calm winds are expected throughout the advisory time, especially during the overnight and morning hours. A weak front Thursday night into Friday may allow for a brief period of improved mixing and particulate dispersion.

* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in freezing fog and fog. 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...Valleys in eastern Curry County and Josephine County and Jackson County. This includes, the Illinois, Rogue and Applegate valleys, including Grants Pass, Selma, Cave Junction, Applegate, Rogue River, Medford, Eagle Point, Jacksonville, Ashland and surrounding areas. * WHEN...For the Air Stagnation Advisory, until noon PST Friday. For the Freezing Fog Advisory, until 10 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. Freezing fog may allow spots of ice to develop on roadways. Poor air quality may cause issues for people with respiratory problems. * ADDITIONAL DETAILS...Strong valley inversions, very shallow mixing layers of less than 1000 feet, and calm winds are expected throughout the advisory time, especially during the overnight and morning hours. A weak front Thursday night into Friday may allow for a brief period of improved mixing and particulate dispersion.

* WHAT...Moderate air quality will continue. This is due to an inversion and stagnant air conditions near the surface that will continue to trap pollutants. * WHERE...Valleys across Lake County and eastern Klamath County, South Central Oregon Coast, Eastern Douglas County Foothills, and Klamath Basin. * WHEN...Until noon PST Friday. * IMPACTS...Moderate air quality may cause issues for people with respiratory problems.

* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in freezing fog and fog. 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...Valleys in eastern Curry County and Josephine County and Jackson County. This includes, the Illinois, Rogue and Applegate valleys, including Grants Pass, Selma, Cave Junction, Applegate, Rogue River, Medford, Eagle Point, Jacksonville, Ashland and surrounding areas. * WHEN...For the Air Stagnation Advisory, until noon PST Friday. For the Freezing Fog Advisory, until 10 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. Freezing fog may allow spots of ice to develop on roadways. Poor air quality may cause issues for people with respiratory problems. * ADDITIONAL DETAILS...Strong valley inversions, very shallow mixing layers of less than 1000 feet, and calm winds are expected throughout the advisory time, especially during the overnight and morning hours. A weak front Thursday night into Friday may allow for a brief period of improved mixing and particulate dispersion.

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory, moderate air quality will continue. This is due to an inversion and stagnant air conditions near the surface that will continue to trap pollutants. * WHERE...Valleys in central Douglas County. This includes Roseburg, Sutherlin, Elkton, Camas Valley, Canyonville, Glendale and surrounding areas. * WHEN...For the Air Stagnation Advisory, until noon PST Friday. For the Dense Fog Advisory, until 10 AM PST this morning. * IMPACTS...Moderate air quality may cause issues for people with respiratory problems. * ADDITIONAL DETAILS...Strong valley inversions, very shallow mixing layers of less than 1000 feet, and calm winds are expected throughout the advisory time, especially during the overnight and morning hours. A weak front Thursday night into Friday may allow for a brief period of improved mixing and particulate dispersion.

* 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. * WHERE...Portions of south central, southwest, and west central Idaho and northeast and southeast Oregon. * WHEN...Until 11 AM MST /10 AM PST/ Friday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in freezing fog and fog. 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...Valleys in eastern Curry County and Josephine County and Jackson County. This includes, the Illinois, Rogue and Applegate valleys, including Grants Pass, Selma, Cave Junction, Applegate, Rogue River, Medford, Eagle Point, Jacksonville, Ashland and surrounding areas. * WHEN...For the Freezing Fog Advisory, until 10 AM PST this morning. For the Air Stagnation Advisory, until noon PST Friday. * IMPACTS...Low visibility could make driving conditions hazardous. Freezing fog may allow spots of ice to develop on roadways. Poor air quality may cause issues for people with respiratory problems. * ADDITIONAL DETAILS...Strong valley inversions, very shallow mixing layers of less than 1000 feet, and calm winds are expected throughout the advisory time, especially during the overnight and morning hours. A weak front Thursday night into Friday may allow for a brief period of improved mixing and particulate dispersion.

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory, moderate air quality will continue. This is due to an inversion and stagnant air conditions near the surface that will continue to trap pollutants. * WHERE...Valleys in central Douglas County. This includes Roseburg, Sutherlin, Elkton, Camas Valley, Canyonville, Glendale and surrounding areas. * WHEN...For the Dense Fog Advisory, until 10 AM PST this morning. For the Air Stagnation Advisory, until noon PST Friday. * IMPACTS...Low visibility could make driving conditions hazardous. Poor air quality may cause issues for people with respiratory problems. * ADDITIONAL DETAILS...Strong valley inversions, very shallow mixing layers of less than 1000 feet, and calm winds are expected throughout the advisory time, especially during the overnight and morning hours. A weak front Thursday night into Friday may allow for a brief period of improved mixing and particulate dispersion.

* WHAT...Moderate air quality will continue. This is due to an inversion and stagnant air conditions near the surface that will continue to trap pollutants. * WHERE...Valleys across Lake County and eastern Klamath County, South Central Oregon Coast, Eastern Douglas County Foothills, and Klamath Basin. * WHEN...Until noon PST Friday. * IMPACTS...Moderate air quality may cause issues for people with respiratory problems.

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory, moderate air quality will continue. This is due to an inversion and stagnant air conditions near the surface that will continue to trap pollutants. * WHERE...Valleys in central Douglas County. This includes Roseburg, Sutherlin, Elkton, Camas Valley, Canyonville, Glendale and surrounding areas. * WHEN...For the Dense Fog Advisory, until 10 AM PST this morning. For the Air Stagnation Advisory, until noon PST Friday. * IMPACTS...Low visibility could make driving conditions hazardous. Poor air quality may cause issues for people with respiratory problems. * ADDITIONAL DETAILS...Strong valley inversions, very shallow mixing layers of less than 1000 feet, and calm winds are expected throughout the advisory time, especially during the overnight and morning hours. A weak front Thursday night into Friday may allow for a brief period of improved mixing and particulate dispersion.

* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in freezing fog and fog. 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...Valleys in eastern Curry County and Josephine County and Jackson County. This includes, the Illinois, Rogue and Applegate valleys, including Grants Pass, Selma, Cave Junction, Applegate, Rogue River, Medford, Eagle Point, Jacksonville, Ashland and surrounding areas. * WHEN...For the Freezing Fog Advisory, until 10 AM PST this morning. For the Air Stagnation Advisory, until noon PST Friday. * IMPACTS...Low visibility could make driving conditions hazardous. Freezing fog may allow spots of ice to develop on roadways. Poor air quality may cause issues for people with respiratory problems. * ADDITIONAL DETAILS...Strong valley inversions, very shallow mixing layers of less than 1000 feet, and calm winds are expected throughout the advisory time, especially during the overnight and morning hours. A weak front Thursday night into Friday may allow for a brief period of improved mixing and particulate dispersion.

Patchy dense freezing fog will continue into late evening hours across the Blue Mountain Foothills of WA and OR. Visibilities of less than 1/2 mile are possible in spots, especially along Highway 11 near Athena, Interstate 84 near Pendleton and in portions of Walla Walla. Drivers should expect sudden reductions in visibility. Slow down and allow for extra space between yourself and other vehicles if you encounter dense fog.