Aggregator

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory, light winds and limited air movements will lead to a period of stagnant air conditions. * WHERE...Lane County Lowlands. * WHEN...For the Dense Fog Advisory, until noon PST today. For the Air Stagnation Advisory, until 10 AM PST Thursday. * IMPACTS...Low visibility could make driving conditions hazardous.

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Air Stagnation Advisory, light winds and limited air movements will lead to a period of stagnant air conditions. * WHERE...Lane County Lowlands. * WHEN...For the Dense Fog Advisory, until noon PST today. For the Air Stagnation Advisory, until 10 AM PST Thursday. * IMPACTS...Low visibility could make driving conditions hazardous.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portland Metro Lowlands, Greater Vancouver Metro, and Portland West Hills and Chehalem Mountain. * WHEN...Until noon PST today. * IMPACTS...Low visibility could make driving conditions hazardous.

Patchy dense freezing fog has been observed across north central Oregon as well as the Lower Columbia Basin of Oregon and the Blue Mountain Foothills. The visibility is less than one half mile in places. This includes Highway 11 near Weston, Interstate 84 in Hermiston, and Highways 97 and 197 north of Madras. Drivers should expect a sudden reduction in visibility as well as black ice on the roadways.

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

Patchy dense freezing fog has been observed across north central Oregon as well as the Lower Columbia Basin of Oregon and the Blue Mountain Foothills. The visibility is less than one half mile in places. This includes Highway 11 near Weston, Interstate 84 in Hermiston, and Highways 97 and 197 north of Madras. Drivers should expect a sudden reduction in visibility as well as black ice on the roadways.

* 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...Visibility one quarter to one half mile in freezing fog. * WHERE...Foothills of the Blue Mountains of Washington. * WHEN...Until noon PST today. * IMPACTS...Low visibility could make driving conditions hazardous. Slick spots on roadways possible under freezing fog.

* WHAT...Visibility one quarter to one half mile in freezing fog. * WHERE...Lower Columbia Basin of Washington. * WHEN...Until noon PST today. * IMPACTS...Low visibility could make driving conditions hazardous. Slick spots on roadways possible under freezing fog.

* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in freezing 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 10 AM PST Thursday. * 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 on Thursday may allow for a brief period of improved mixing and particulate dispersion.

* WHAT...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 near the South Central Oregon Coast and in the Eastern Douglas County Foothills, and east of the Cascades in Klamath and Lake Counties. This includes the cities of Coquille, Myrtle Point, Steamboat, Klamath Falls, Chiloquin, Crescent, Lakeview, Paisley, Silver Lake and surrounding areas. * WHEN...Until 10 AM PST Thursday. * IMPACTS...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 on Thursday 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, 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 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 10 AM PST Thursday. * 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 on Thursday 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, 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 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 10 AM PST Thursday. * 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 on Thursday 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. 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 10 AM PST Thursday. * 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 on Thursday may allow for a brief period of improved mixing and particulate dispersion.

Dense freezing fog across Walla Walla county is slowly expanding west towards the Columbia River and the Tri-Cities area, with low visibilities being observed near the confluence of the Snake and Columbia Rivers. This area of fog is expected to gradually extend west through the overnight hours, with visibilities of one half mile or less expected.

Dense freezing fog has been slow to expand south this evening, but is still expected to continue to grow in area through the overnight hours. Visibility a half mile or less will continue to impact Oregon Highway 11 north of Adams and areas from Helix to the state border.

A narrow band of freezing fog extending from Dufur to Lexington has developed this evening. The fog is expected to gradually expand across the southern Blue Mountain Foothills as North Central Oregon through the overnight hours, with visibilities of a mile or less possible.

* WHAT...Visibility one quarter mile or less in freezing fog. * WHERE...Foothills of the Blue Mountains of Washington. * WHEN...Until noon PST Wednesday. * IMPACTS...Low visibility could make driving conditions hazardous. Slick spots on roadways possible under freezing fog.

Dense freezing fog with visibilities at a half mile or less is beginning to extend along Oregon Highway 11. Observations show the fog has extended at least as far south as Athena. The fog bank is expected to continue expanding south along the northern Blue Mountain foothills, impacting the Pendleton area and portions of Interstate-84 later tonight.

* WHAT...Poor air quality due to a period of stagnant air with light winds. * WHERE...Central and Southern Willamette Valley. * WHEN...Until 10 AM PST Thursday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.