* WHAT...Visibility less than one quarter mile in freezing fog.
Although there will be some improvement in the visibility this
afternoon, dense freezing fog will return tonight.
* WHERE...Foothills of the Southern Blue Mountains of Oregon and
North Central Oregon.
* WHEN...Until 11 AM PST Friday.
* IMPACTS...Low visibility and slick roads could make driving
conditions hazardous.
* ADDITIONAL DETAILS...Periods of light snow flurries or light
freezing drizzle may be observed as well.
* 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...Treasure Valley Zones.
* WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday.
For the Dense Fog Advisory, until 2 PM MST Friday.
* IMPACTS...Low visibility could make driving conditions hazardous
especially for the morning commute. Poor air quality may cause
issues for people with respiratory problems. Low visibility could
make driving conditions hazardous.
* ADDITIONAL DETAILS...Fog could produce patchy black ice and slick
roads.
* 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...Treasure Valley Zones.
* WHEN...For the Air Stagnation Advisory, until 5 PM MST Saturday.
For the Dense Fog Advisory, until 2 PM MST Friday.
* IMPACTS...Low visibility could make driving conditions hazardous
especially for the morning commute. Poor air quality may cause
issues for people with respiratory problems. Low visibility could
make driving conditions hazardous.
* ADDITIONAL DETAILS...Fog could produce patchy black ice and slick
roads.
* WHAT...Valley locations may see poor air quality. This is due to
an inversion and stagnant air conditions near the surface that
will continue to trap pollutants.
* WHERE...Valleys in Douglas, Josephine, and Jackson County. This
includes the Umpqua, Illinois, Applegate, and Rogue valleys.
* WHEN...Until 4 AM PST Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...Valley locations may see poor air quality. This is due to
an inversion and stagnant air conditions near the surface that
will continue to trap pollutants.
* WHERE...Valleys in central and northern Lake County and Klamath
County. This includes Klamath Falls, Sprague River, Chiloquin,
Chemult, Silver Lake, Paisley and surrounding areas.
* WHEN...Until 4 AM PST Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...For the Freezing Fog Advisory, visibility one quarter mile
or less in fog and 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.
* WHEN...For the Air Stagnation Advisory, until 4 AM PST Saturday.
For the Freezing Fog Advisory, until 11 AM PST this morning.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous. With temperatures at or just below freezing, fog
droplets may freeze on contact with surfaces, with slick spots on
roadways possible early Thursday.
* 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...East Central Willamette Valley.
* WHEN...Until 4 AM PST Saturday.
* IMPACTS...Poor 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, West Central Willamette Valley, Willapa and
Wahkiakum Lowlands, North Clark County Lowlands, and South
Washington Cascade Foothills.
* WHEN...Until 4 AM PST Saturday.
* 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 fog and 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.
* WHEN...For the Air Stagnation Advisory, until 4 AM PST Saturday.
For the Freezing Fog Advisory, until 11 AM PST this morning.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous. With temperatures at or just below freezing, fog
droplets may freeze on contact with surfaces, with slick spots on
roadways possible early Thursday.
* WHAT...Visibility one quarter mile or less 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...Visibility one quarter mile or less 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 one quarter mile or less 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...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 Saturday.
* 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 fog and 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.
* WHEN...For the Air Stagnation Advisory, until 4 AM PST Saturday.
For the Freezing Fog Advisory, until 11 AM PST this morning.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous. With temperatures at or just below freezing, fog
droplets may freeze on contact with surfaces, with slick spots on
roadways possible overnight into early Thursday.
* WHAT...For the Freezing Fog Advisory, visibility one quarter mile
or less in fog and 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...East Central Willamette Valley.
* WHEN...For the Freezing Fog Advisory, until 11 AM PST this
morning. For the Air Stagnation Advisory, until 4 AM PST Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous. With temperatures at or just below freezing, fog
droplets may freeze on contact with surfaces, with slick spots on
roadways possible overnight into early Thursday.
* WHAT...For the Freezing Fog Advisory, visibility one quarter mile
or less in fog and 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.
* WHEN...For the Air Stagnation Advisory, until 4 AM PST Saturday.
For the Freezing Fog Advisory, until 11 AM PST this morning.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous. With temperatures at or just below freezing, fog
droplets may freeze on contact with surfaces, with slick spots on
roadways possible overnight into early Thursday.
* WHAT...For the Freezing Fog Advisory, visibility one quarter mile
or less in fog and 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...East Central Willamette Valley.
* WHEN...For the Freezing Fog Advisory, until 11 AM PST this
morning. For the Air Stagnation Advisory, until 4 AM PST Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous. With temperatures at or just below freezing, fog
droplets may freeze on contact with surfaces, with slick spots on
roadways possible overnight into early Thursday.
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, Central Willamette Valley,
Tualatin Valley, Outer Southeast Portland Metro, Willapa and
Wahkiakum Lowlands, North Clark County Lowlands, and South
Washington Cascade Foothills.
* WHEN...Until 4 AM PST Saturday.
* IMPACTS...Deteriorating air quality may cause issues for people
with respiratory problems.
