* 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 9 PM MST /8 PM PST/ Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...For the Dense Fog Advisory, visibility one to two miles in
dense fog.
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.
* WHERE...Lower Treasure Valley Zones.
* WHEN...For the Dense Fog Advisory, until 11 AM MST Monday. For the
Air Stagnation Advisory, until 9 PM MST Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous especially along Interstate 84 from Fruitland, Idaho
through Huntington, Oregon.
* WHAT...For the Dense Fog Advisory, visibility one to two miles in
dense fog.
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.
* WHERE...Lower Treasure Valley Zones.
* WHEN...For the Dense Fog Advisory, until 11 AM MST Monday. For the
Air Stagnation Advisory, until 9 PM MST Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous especially along Interstate 84 from Fruitland, Idaho
through Huntington, Oregon.
* 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.
* WHAT...Temperatures of 33 to 36 will result in frost formation.
* WHERE...South Central Oregon Coast, including all coastal areas
from Port Orford north to around Reedsport as well as the Coquille
Valley.
* WHEN...From 9 PM this evening to 9 AM PST Monday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
* ADDITIONAL DETAILS...A few of the typically colder locations could
fall to freezing.
* WHAT...Dense fog has decreased this afternoon, but areas of
lighter fog will continue through the afternoon and evening, then
become dense again late tonight and Monday.
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...Oregon Lower Treasure Valley.
* WHEN...Until 9 PM MST Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* 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 9 PM MST /8 PM PST/ Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...A high risk of sneaker waves is expected.
* WHERE...All beaches and shorelines of Douglas, Coos, and Curry
counties.
* WHEN...Until 5 PM PST this afternoon.
* IMPACTS...Sneaker waves can run up significantly farther on
beaches than normal, including over rocks and jetties. These
waves can suddenly knock people off of their feet and quickly
pull them into the cold ocean waters, resulting in serious
injury or death. Waves may also lift driftwood logs, trapping
anyone caught underneath.
* View the hazard area in detail at
https://www.wrh.noaa.gov/map/?wfo=mfr
* 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...Central and Southern Willamette Valley, 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...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 9 PM MST /8 PM PST/ Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...For the Dense Fog Advisory, visibility less than one
quarter mile in dense fog. 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.
* WHERE...Oregon Lower Treasure Valley.
* WHEN...For the Dense Fog Advisory, until 2 PM MST this afternoon.
For the Air Stagnation Advisory, until 9 PM MST Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous.
* WHAT...For the Dense Fog Advisory, visibility less than one
quarter mile in dense fog. 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.
* WHERE...Oregon Lower Treasure Valley.
* WHEN...For the Dense Fog Advisory, until 2 PM MST this afternoon.
For the Air Stagnation Advisory, until 9 PM MST Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems. Low visibility 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...Tualatin Valley.
* WHEN...Until 4 AM PST Thursday.
* IMPACTS...Deteriorating 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, 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...Lane County Lowlands.
* WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday.
For the Dense Fog Advisory, until noon PST today.
* IMPACTS...Deteriorating air quality may cause issues for people
with respiratory problems. Low visibility 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...Foothills of the Northern and Central Oregon Cascades,
North and Central Coast Range Valleys of Oregon, Willapa and
Wahkiakum 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 Dense Fog Advisory, visibility one quarter mile or
less in dense 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...Lower Columbia River and Cowlitz River Valleys, and North
Clark County Lowlands.
* WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday.
For the Dense Fog Advisory, until noon PST today.
* IMPACTS...Deteriorating air quality may cause issues for people
with respiratory problems. Low visibility could make driving
conditions hazardous.
* WHAT...For the Freezing Fog Advisory, visibility one quarter mile
or less in 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...Central Willamette Valley, Benton County Lowlands, and
Linn County Lowlands.
* WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday.
For the Freezing Fog Advisory, until noon PST today.
* IMPACTS...For the Freezing Fog Advisory, low visibility could make
driving conditions hazardous. For the Air Stagnation Advisory,
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...Portland Metro Hills.
* WHEN...Until 4 PM PST Monday.
* IMPACTS...Deteriorating 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, 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...In Oregon, Inner Portland Metro. In Washington, Inner
Vancouver Metro.
* WHEN...For the Air Stagnation Advisory, until 4 PM PST Monday. For
the Dense Fog Advisory, until noon PST today.
* IMPACTS...For the Dense Fog Advisory, low visibility could make
driving conditions hazardous. For the Air Stagnation Advisory,
deteriorating 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, 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...Lower Columbia River and Cowlitz River Valleys, and North
Clark County Lowlands.
* WHEN...For the Air Stagnation Advisory, until 4 AM PST Thursday.
For the Dense Fog Advisory, until noon PST today.
* IMPACTS...Deteriorating air quality may cause issues for people
with respiratory problems. Low visibility could make driving
conditions hazardous.
