Aggregator

* WHAT...Strong valley inversions will result in weak winds, poor mixing and ventilation. This will result in stagnant air conditions that will trap pollutants near the surface. * WHERE...Lake County and eastern Klamath County, and Klamath Basin. This includes the cities of Klamath Falls and Lakeview. * WHEN...Until noon PST Friday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

* WHAT...Strong valley inversions will result in weak winds, poor mixing and ventilation. This will result in stagnant air conditions that will trap pollutants near the surface. * WHERE...For the Air Stagnation Advisory, Central Douglas County, Eastern Curry County and Josephine County, and Jackson County. This includes the cities of Roseburg, Grants Pass, Cave Junction and Medford. * WHEN...Until noon PST Friday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

* 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...Eastern Douglas County Foothills, including Steamboat. * WHEN...Until noon PST Friday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

Patchy dense freezing fog has developed along the Highway 97 corridor south of Bend, as visibilities of one quarter of a mile or less have been observed on area webcams and local weather stations. Fog is expected to persist through the morning, likely dissipating around 11 AM. motorists are urged to use caution as visibilities may vary or change drastically, and roadways may be slick due to ice depositing on the road surface.

* WHAT...Snow expected at or above elevations greater than 2500 ft. Total snow accumulations up to 8 to 12 inches. * WHERE...West Slopes North Central Cascades and Passes. * WHEN...From 6 AM Friday to 6 AM PST Saturday. * IMPACTS...Travel could be very difficult to impossible. * ADDITIONAL DETAILS...Convergence zone showers late Friday may locally enhance snowfall amounts and cause heavy snow at times through the central Cascade Passes.

* WHAT...Snow expected. Total snow accumulations between 6 and 11 inches. Winds gusting as high as 35 mph. * WHERE...Holden Village, Stevens Pass. * WHEN...From 6 AM Friday to 6 AM PST Saturday. * IMPACTS...Travel could be very difficult on Highway 2 over Stevens Pass.

* WHAT...West winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...Foothills of the Blue Mountains of Oregon. * WHEN...From 4 PM Friday to 1 AM PST Saturday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT...South winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...Grande Ronde Valley. * WHEN...From 1 AM to 1 PM PST Friday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

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

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

* WHAT...Strong valley inversions will result in weak winds, poor mixing and ventilation. This will result in stagnant air conditions that will trap pollutants near the surface. * WHERE...Lake County and eastern Klamath County, and Klamath Basin. This includes the cities of Klamath Falls and Lakeview. * WHEN...Until noon PST Friday. * IMPACTS...Poor 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, 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...For the Dense Fog Advisory, Central Douglas County, Josephine County, and Jackson County. For the Air Stagnation Advisory, Central Douglas County, Eastern Curry County and Josephine County, and Jackson County. This includes the cities of Roseburg, Grants Pass, Cave Junction and Medford. * 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...Mixing and ventilation should be better at the south end of the Rogue Valley from around Talent to Ashland due to stronger SE winds.

* 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...Eastern Douglas County Foothills, including Steamboat. * WHEN...Until noon PST Friday. * IMPACTS...Poor 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, 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...For the Dense Fog Advisory, Central Douglas County, Josephine County, and Jackson County. For the Air Stagnation Advisory, Central Douglas County, Eastern Curry County and Josephine County, and Jackson County. This includes the cities of Roseburg, Grants Pass, Cave Junction and Medford. * 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...Mixing and ventilation should be better at the south end of the Rogue Valley from around Talent to Ashland due to stronger SE winds.

Patchy dense freezing fog has developed along the I-84 corridor, primarily over Cabbage Hill between mileposts 220 and 240 near Meacham. Fog may expand its footprint overnight and into the morning hours on Thursday. Motorists are urged to use caution as visibilities may vary or change drastically , and roadways may be slick due to ice depositing on the road surface.

* WHAT...Visibility one quarter mile or less in freezing fog. * WHERE...Central Oregon and North Central Oregon. * WHEN...Until 11 AM PST this morning. * IMPACTS...Low visibility 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. * WHERE...Portions of 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...Snow expected. Localized snow accumulations of 1 to 2 inches. * WHERE...Mead, Colbert, Newman Lake, Rathdrum, Hayden, Post Falls, and Coeur d'Alene. * WHEN...Until 8 AM PST this morning. * IMPACTS...Quick accumulations will occur with a band of snow mainly north of Interstate 90 across the Spokane and Coeur d'Alene metro area. Motorists should be prepared for locally treacherous conditions during the morning commute.

* WHAT...Strong valley inversions will result in weak winds, poor mixing and ventilation. This will result in stagnant air conditions that will trap pollutants near the surface. * WHERE...Lake County and eastern Klamath County, and Klamath Basin. This includes the cities of Klamath Falls and Lakeview. * WHEN...Until noon PST Friday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems.

* WHAT...Strong valley inversions will result in weak winds, poor mixing and ventilation. This will result in stagnant air conditions that will trap pollutants near the surface. * WHERE...Central Douglas County, Eastern Curry County and Josephine County, Eastern Douglas County Foothills, and Jackson County. This includes the cities of Roseburg, Grants Pass, Cave Junction and Medford. * WHEN...Until noon PST Friday. * IMPACTS...Poor air quality may cause issues for people with respiratory problems. * ADDITIONAL DETAILS...Mixing and ventilation should be better at the south end of the Rogue Valley from around Talent to Ashland due to stronger SE winds.