Aggregator

* 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, visibility one quarter mile or less at times in areas of dense freezing fog. * WHERE...Central and Southern Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday. For the Freezing Fog Advisory, until 11 AM PST this morning. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility in areas of dense freezing fog could make driving conditions hazardous. * ADDITIONAL DETAILS...Frost is possible on elevated surfaces and grassy surfaces, as well as bridges and overpasses.

* 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, visibility one quarter mile or less at times in areas of dense freezing fog. * WHERE...Central and Southern Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday. For the Freezing Fog Advisory, until 11 AM PST this morning. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility in areas of dense freezing fog could make driving conditions hazardous. * ADDITIONAL DETAILS...Frost is possible on elevated surfaces and grassy surfaces, as well as bridges and overpasses.

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...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...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 Freezing Fog Advisory, visibility one quarter mile or less in areas of dense 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, and East Central Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday. For the Freezing Fog Advisory, until 11 AM PST Tuesday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility in areas of dense freezing fog could make driving conditions hazardous. * ADDITIONAL DETAILS...Dense fog will impact portions of the I-5 corridor from Salem to Eugene. Frost is possible on elevated surfaces and grassy surfaces, as well as bridges and overpasses.

* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in areas of dense 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...West Central Willamette Valley. * WHEN...For the Freezing Fog Advisory, until 11 AM PST Tuesday. For the Air Stagnation Advisory, until 4 AM PST Thursday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility in areas of dense freezing fog could make driving conditions hazardous. * ADDITIONAL DETAILS...Frost is possible on elevated surfaces and grassy surfaces, as well as bridges and overpasses.

* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in areas of dense 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, and East Central Willamette Valley. * WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday. For the Freezing Fog Advisory, until 11 AM PST Tuesday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility in areas of dense freezing fog could make driving conditions hazardous. * ADDITIONAL DETAILS...Dense fog will impact portions of the I-5 corridor from Salem to Eugene. Frost is possible on elevated surfaces and grassy surfaces, as well as bridges and overpasses.

* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in areas of dense 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...West Central Willamette Valley. * WHEN...For the Freezing Fog Advisory, until 11 AM PST Tuesday. For the Air Stagnation Advisory, until 4 AM PST Thursday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility in areas of dense freezing fog could make driving conditions hazardous. * ADDITIONAL DETAILS...Frost is possible on elevated surfaces and grassy surfaces, as well as bridges and overpasses.

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

* WHAT...Visibility one quarter of a mile or less in freezing fog. * WHERE...Central Oregon, mainly areas to the north of Bend. * WHEN...Until 11 AM PST Tuesday. * IMPACTS...Low visibility and slick conditions could make driving hazardous.

* 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. * 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, West Central Willamette Valley, 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. * WHERE...Inner Vancouver Metro. * 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. * 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, West Central Willamette Valley, 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 Freezing Fog Advisory, visibility one quarter mile or less in areas of dense 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, and East Central Willamette Valley. * WHEN...For the Freezing Fog Advisory, until 11 AM PST Tuesday. For the Air Stagnation Advisory, until 4 AM PST Thursday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility in areas of dense freezing fog could make driving conditions hazardous. * ADDITIONAL DETAILS...Dense fog will impact portions of the I-5 corridor from Salem to Eugene. Frost is possible on elevated surfaces and grassy surfaces, as well as bridges and overpasses.

* WHAT...For the Freezing Fog Advisory, visibility one quarter mile or less in areas of dense 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, and East Central Willamette Valley. * WHEN...For the Freezing Fog Advisory, until 11 AM PST Tuesday. For the Air Stagnation Advisory, until 4 AM PST Thursday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems. Low visibility in areas of dense freezing fog could make driving conditions hazardous. * ADDITIONAL DETAILS...Dense fog will impact portions of the I-5 corridor from Salem to Eugene. Frost is possible on elevated surfaces and grassy surfaces, as well as bridges and overpasses.

* 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 Wednesday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.