* 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 a 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
may trap pollutants.
* WHERE...Oregon Lower Treasure Valley.
* WHEN...For the Dense Fog Advisory, until noon MST today. 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 a 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
may trap pollutants.
* WHERE...Oregon Lower Treasure Valley.
* WHEN...For the Dense Fog Advisory, until noon MST today. 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.
Visibilities of one-quarter mile or less in patchy dense fog are
apparent in north-central Oregon this morning, including along
US-97 and US-197. If traveling, be prepared for sudden changes in
visibility and use low-beam headlights. Fog is expected to persist
through early morning.
Visibilities of one-quarter mile or less in patchy dense fog are
apparent in north-central Oregon this morning, including along
along US-97 and US-197. If traveling, be prepared for sudden
changes in visibility and use low-beam headlights. Fog is expected
to persist through early morning.
* 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, Lane County
Lowlands, Willapa and Wahkiakum 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...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 9 AM PST this morning.
* 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...For the Dense Fog Advisory, visibility one quarter mile or
less at times 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, Tualatin
Valley, and North Clark County Lowlands.
* WHEN...For the Dense Fog Advisory, until 9 AM PST this morning.
For the Air Stagnation Advisory, until 4 AM PST Thursday.
* 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 at times 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 Dense Fog Advisory, until 9 AM PST this morning.
For the Air Stagnation Advisory, until 4 PM PST Monday.
* 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...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 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 9 AM PST this morning.
* 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...For the Dense Fog Advisory, visibility one quarter mile or
less at times 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 Dense Fog Advisory, until 9 AM PST this morning.
For the Air Stagnation Advisory, until 4 PM PST Monday.
* 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 at times 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, Tualatin
Valley, and North Clark County Lowlands.
* WHEN...For the Dense Fog Advisory, until 9 AM PST this morning.
For the Air Stagnation Advisory, until 4 AM PST Thursday.
* 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...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...Valleys in Eastern Curry County and Josephine County,
Jackson County, Central Douglas County, eastern Klamath County and
Lake County. West of the Cascades, this includes the Umpqua,
Illinois, Applegate, and Rogue valleys. East of the Cascades,
this includes 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...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. For the
Freezing Fog Advisory, visibility one quarter mile or less in
freezing fog.
* WHERE...Klamath Basin. This includes Klamath Falls, Sprague River,
Merrill, Keno, Chiloquin and surrounding areas.
* WHEN...For the Air Stagnation Advisory, until 4 PM PST Wednesday.
For the Freezing Fog Advisory, until 9 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
Watch for icy spots on roads. Poor air quality may cause issues
for people with respiratory problems.
* WHAT...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. For the
Freezing Fog Advisory, visibility one quarter mile or less in
freezing fog.
* WHERE...Klamath Basin. This includes Klamath Falls, Sprague River,
Merrill, Keno, Chiloquin and surrounding areas.
* WHEN...For the Air Stagnation Advisory, until 4 PM PST Wednesday.
For the Freezing Fog Advisory, until 9 AM PST this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
Watch for icy spots on roads. Poor air quality may cause issues
for people with respiratory problems.
* WHAT...For the Freeze Warning, sub-freezing temperatures as low as
30 expected. For the Frost Advisory, temperatures as low as 33
will result in frost formation.
* WHERE...The Frost Advisory includes most areas of coastal Douglas
and Coos County. The Freeze Warning includes Coos Bay, North Bend,
Lakeside, Charleston, Bandon and portions of the inland Coquille
Valley.
* WHEN...Until 9 AM PST this morning.
* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.
* WHAT...For the Freeze Warning, sub-freezing temperatures as low as
30 expected. For the Frost Advisory, temperatures as low as 33
will result in frost formation.
* WHERE...The Frost Advisory includes most areas of coastal Douglas
and Coos County. The Freeze Warning includes Coos Bay, North Bend,
Lakeside, Charleston, Bandon and portions of the inland Coquille
Valley.
* WHEN...Until 9 AM PST this morning.
* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.
* WHAT...A high risk of sneaker waves is expected.
* WHERE...All beaches and shorelines of Douglas, Coos, and Curry
counties.
* WHEN...Until 1 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...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 Freezing Fog Advisory, until 9 AM PST this morning.
For the Air Stagnation Advisory, until 4 AM PST Thursday.
* 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.
