* 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 Saturday.
* 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, 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.
* 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 Thursday.
* 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 Thursday.
* 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...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...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...For the Air Stagnation Advisory, until 4 AM PST Saturday.
For the Dense Fog Advisory, until 1 PM PST Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous.
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Curry County Coast and South Central Oregon Coast.
* WHEN...Until 1 PM PST Thursday.
* IMPACTS...Low visibility could make driving conditions hazardous.
* 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...For the Air Stagnation Advisory, until 4 AM PST Saturday.
For the Dense Fog Advisory, until 1 PM PST Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous.
* WHAT...Visibility one quarter to one half mile in areas of dense
fog and localized freezing fog.
* WHERE...Admiralty Inlet Area, Hood Canal Area, Western Skagit
County, Western Whatcom County, Bremerton and Vicinity, Everett
and Vicinity, Seattle and Vicinity, Southwest Interior, and Tacoma
Area.
* WHEN...Until 10 AM PST Thursday.
* IMPACTS...Areas of low visibility could make driving conditions
hazardous.
* ADDITIONAL DETAILS...Areas of sub-freezing temperatures into
Thursday morning may cause localized freezing fog.
* WHAT...Visibility one quarter mile or less in freezing fog.
* WHERE...Central Oregon.
* WHEN...Until 11 AM PST Thursday.
* 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 Thursday.
* IMPACTS...Low visibility and slick roads could make driving
conditions hazardous.
* WHAT...Visibility one quarter mile or less in freezing fog.
* WHERE...John Day Basin.
* WHEN...Until 11 AM PST Thursday.
* 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...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, 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 Thursday.
* 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 Freezing Fog Advisory, until 11 AM PST Thursday.
For the Air Stagnation Advisory, until 4 AM PST Thursday.
* 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 Freezing Fog Advisory, until 11 AM PST Thursday.
For the Air Stagnation Advisory, until 4 AM PST Thursday.
* 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...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 Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
ESFSEW
A stronger storm system will move though the area over much of the
weekend that could produce enough rainfall to drive the Skokomish
River above flood stage. There is still a fair amount of uncertainty
regarding flooding since the precipitation forecasts have been quite
variable from run to run. On the low end, it would not produce a
flood, but on the high end minor flooding would be likely. Snow
level during the storm will not be an issue since for most of the
heavy precipitation, the snow level will be 7000 to 9000 feet.
Please monitor the latest river forecasts from the National Weather
Service for additional information.
* 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 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.