* 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 as low as one quarter mile in freezing fog.
* WHERE...Central Oregon and North Central Oregon.
* WHEN...Until 10 AM PST Friday.
* IMPACTS...Low visibility could make driving conditions hazardous.
Some roads may be slick under freezing fog as well.
* WHAT...Snow expected. Total snow accumulations between 7 and 12
inches. Winds gusting as high as 35 mph.
* WHERE...Holden Village, and 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...Snow expected at or above elevations greater than 2500 ft.
Total snow accumulations up to 6 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.
* ADDITIONAL DETAILS...Convergence zone showers late Friday may
locally enhance snowfall amounts and cause heavy snow at times
through the central Cascade Passes.
* 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...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 dense fog.
* WHERE...Benton County Lowlands.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Lane County Lowlands.
* WHEN...Until noon PST today.
* 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...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.