Aggregator

* WHAT...Visibility less than one quarter of a mile in freezing fog. * WHERE...Central Oregon. * WHEN...Until 11 AM PST this morning. * IMPACTS...Low visibility and slick roads could make driving conditions hazardous.

* WHAT...Visibility less than one quarter mile in freezing fog. * WHERE...Foothills of the Southern Blue Mountains of Oregon and North Central Oregon. * WHEN...Until 11 AM PST this morning. * IMPACTS...Low visibility and slick roads could make driving conditions hazardous.

* WHAT...Visibility less than one quarter of a mile in freezing fog. * WHERE...John Day Basin. * WHEN...Until 11 AM PST this morning. * IMPACTS...Low visibility and slick roads could make driving conditions hazardous.

* 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...Inner Vancouver Metro. * WHEN...Until 4 AM PST Thursday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.

* 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.

* 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.

* 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.

* 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.

* WHAT...Visibility one quarter to one half mile in areas of dense fog and freezing fog. * WHERE...Hood Canal Area, Bellevue and Vicinity, Bremerton and Vicinity, Everett and Vicinity, Seattle and Vicinity, Southwest Interior, and Tacoma Area. * WHEN...Until 10 AM PST this morning. * IMPACTS...Areas of low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Sub-freezing temperatures have caused areas of freezing fog, which may cause black ice to form on 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 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.

* 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.

* 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.

* 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.

Dense freezing fog has formed along Interstate 84 east of Pendleton on Cabbage Hill, with visibilities less than one quarter mile. Motorists are urged to use caution when traveling this stretch of interstate tonight and be alert for patches of ice on the roadways.

* WHAT...Visibility less than one quarter of a mile in freezing fog. * WHERE...John Day Basin. * WHEN...Until 11 AM PST Wednesday. * IMPACTS...Low visibility and slick roads could make driving conditions hazardous.

* WHAT...Visibility less than one quarter of a mile in freezing fog. * WHERE...Central Oregon. * WHEN...Until 11 AM PST Wednesday. * IMPACTS...Low visibility and slick roads could make driving conditions hazardous.

* WHAT...Visibility less than one quarter mile in freezing fog. * WHERE...Foothills of the Southern Blue Mountains of Oregon and North Central Oregon. * WHEN...Until 11 AM PST Wednesday. * IMPACTS...Low visibility and slick roads could make driving conditions hazardous.

* 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.

* 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.

* 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.