* WHAT...Visibility of one-quarter mile or less in freezing fog.
* WHERE...Foothills of the Northern Blue Mountains of Oregon.
* WHEN...Until 10 AM PST Saturday.
* IMPACTS...Low visibility could make driving conditions hazardous.
* WHAT...Visibility of one-quarter mile or less in freezing fog.
* WHERE...Foothills of the Southern Blue Mountains of Oregon.
* WHEN...Until 10 AM PST Saturday.
* IMPACTS...Low visibility could make driving conditions hazardous.
* WHAT...Visibility less than one-quarter mile or less in freezing
fog.
* WHERE...Foothills of the Northern Blue Mountains of Oregon.
* WHEN...Until 10 AM PST Saturday.
* IMPACTS...Low visibility could make driving conditions hazardous.
* 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...For the Dense Fog Advisory, visibility one quarter mile or
less in dense fog. 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.
* WHERE...The Rogue, Bear Creek, and Sams valleys in Jackson County,
including Medford, Ashland, Talent, Phoenix, Eagle Point, Central
Point, and Shady Cove.
* WHEN...For the Dense Fog Advisory, until 11 AM PST Saturday. For
the Air Stagnation Advisory, until 4 PM PST Wednesday.
* IMPACTS...Low visibility could make driving conditions hazardous.
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, 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...The Rogue, Bear Creek, and Sams valleys in Jackson County,
including Medford, Ashland, Talent, Phoenix, Eagle Point, Central
Point, and Shady Cove.
* WHEN...For the Dense Fog Advisory, until 11 AM PST Saturday. For
the Air Stagnation Advisory, until 4 PM PST Wednesday.
* IMPACTS...Low visibility could make driving conditions hazardous.
Poor air quality may cause issues for people with respiratory
problems.
* WHAT...Sub-freezing temperatures as low as 30 expected.
* WHERE...Coastal portions of Coos and Douglas County. This includes
the cities and communities of Coos Bay, Lakeside, and the
outskirts of Charleston and Bandon.
* WHEN...From midnight tonight to 9 AM PST Saturday.
* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.
* 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, 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...Eastern Portland/Vancouver Metro, Portland West Hills and
Chehalem Mountain, Inner Portland Metro, and Inner Vancouver Metro.
* WHEN...Until 4 PM PST Monday.
* 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.
* 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.
* ADDITIONAL DETAILS...The advisory continues through the long-term
forecast, and may be extended if conditions continue.
* WHAT...A high risk of sneaker waves is expected.
* WHERE...All beaches and shorelines of Douglas, Coos, and Curry
counties.
* WHEN...From Saturday evening through Sunday 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...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...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...Stagnant air is expected, which may lead to
deteriorating air quality.
* WHERE...Klamath Basin, Northern and Eastern Klamath County and
Western Lake County and Central and Eastern Lake County.
* WHEN...Until noon PST Sunday.
* IMPACTS...Air stagnation is likely to result in diminishing
air quality with time, especially in and near areas with
significant sources of air pollution. Diminished air quality
is likely to cause health issues for people with respiratory
problems if precautions are not taken.
* View the hazard area in detail at
https://www.wrh.noaa.gov/map/?wfo=mfr
* WHAT...A persistent inversion with light and variable winds will
lead to a period of stagnant air conditions. This scenario could
result in the build up of air pollutants near the surface 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, Willapa and Wahkiakum Lowlands, North
Clark County Lowlands, and South Washington Cascade Foothills.
* WHEN...Until 4 PM PST Tuesday.
* IMPACTS...Deteriorating air quality may cause issues for people
with respiratory problems.
* WHAT...A persistent inversion with light and variable winds will
lead to a period of stagnant air conditions. This scenario could
result in the build up of air pollutants near the surface over
time.
* WHERE...Eastern Portland/Vancouver Metro, Portland West Hills and
Chehalem Mountain, Inner Portland Metro, and Inner Vancouver Metro.
* WHEN...Until 4 PM PST Monday.
* IMPACTS...Deteriorating air quality may cause issues for people
with respiratory problems.
* WHAT...Visibility one quarter mile or less in freezing fog.
* WHERE...Foothills of the Northern Blue Mountains of Oregon.
* WHEN...Until noon PST today.
* IMPACTS...Low visibility could make driving conditions hazardous.
* WHAT...A moderate risk of sneaker waves is expected.
* WHERE...All beaches and shorelines of Douglas, Coos, and Curry
counties.
* WHEN...From Saturday evening through Sunday 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...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 noon PST Sunday, December 29.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
* WHAT...Sub-freezing temperatures of 30 to 32 expected.
* WHERE...South central Oregon Coast. This includes the communities
of North Bend, Port Orford, Myrtle Point, Powers, Reedsport, and
Bandon.
* 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...An extended period of stagnant air, with light winds
and little vertical mixing.
* WHERE...Portions of south central, southwest and west central
Idaho and northeast and southeast Oregon.
* WHEN...Until 9 PM MST /8 PM PST/ Thursday.
* IMPACTS...Periods of air stagnation can lead to the buildup of
pollutants near the surface.
