Dense Fog Advisory

URGENT - WEATHER MESSAGE
National Weather Service Portland OR
705 PM PST Fri Dec 12 2025

ORZ118-131515-
/O.NEW.KPQR.FG.Y.0019.251213T0305Z-251213T1800Z/
Lane County Lowlands-
Including the cities of Creswell, Junction City, Springfield,
Cottage Grove, and Eugene
705 PM PST Fri Dec 12 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM PST SATURDAY...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Lane County Lowlands.

* WHEN...Until 10 AM PST Saturday.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

If driving, slow down and leave plenty of distance ahead of you.
Pedestrians and cyclists should wear bright or reflective clothing
to increase the chances of being seen by others in poor visibility
conditions.

&&

$$

For more information from the National Weather Service visit
www.weather.gov/portland

ts

Small Craft Advisory

URGENT - MARINE WEATHER MESSAGE
National Weather Service Portland OR
234 PM PST Fri Dec 12 2025

PZZ253-273-131445-
/O.NEW.KPQR.SC.Y.0148.251214T0600Z-251214T1800Z/
Coastal waters from Cape Foulweather to Florence OR out 10 NM-
Waters from Cape Foulweather to Florence OR from 10 to 60 NM-
234 PM PST Fri Dec 12 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM SATURDAY TO 10 AM
PST SUNDAY...

* WHAT...Seas 5 to 8 ft at 13 seconds and south winds 15 to 20
  kt with gusts up to 25 kt expected.

* WHERE...Coastal waters from Cape Foulweather to Florence OR
  out 10 NM and Waters from Cape Foulweather to Florence OR from
  10 to 60 NM.

* WHEN...From 10 PM Saturday to 10 AM PST Sunday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$


For more information from the National Weather Service, visit:
https://www.weather.gov/portland/marine

Special Weather Statement

Special Weather Statement
National Weather Service Pendleton OR
1015 PM PST Fri Dec 12 2025

ORZ509-WAZ026-027-521>523-161915-
East Slopes of the Oregon Cascades-Kittitas Valley-Yakima Valley-
Simcoe Highlands-
Upper Slopes of the Eastern Washington Cascades Crest-
Lower Slopes of the Eastern Washington Cascades Crest-
Including the cities of Camp Sherman, La Pine, Sisters, Sunriver,
Ellensburg, Thorp, Naches, Sunnyside, Toppenish, Yakima,
Goldendale, Bickleton, Roslyn, Easton, Appleton, Cle Elum,
and Cliffdell
1015 PM PST Fri Dec 12 2025

...HEAVY CASCADES SNOW AND MORE FLOODING POSSIBLE NEXT WEEK...

Another active weather pattern with a moderately strong
atmospheric river is expected in the Cascades, especially the
Washington Cascades, beginning Monday and Tuesday. Moderate to
heavy rain is possible at the Cascade crest with amounts
decreasing away from the crest. By Tuesday night, snow levels drop
to around 2500 feet and mountain rain will turn over to snow.
Snoqualmie Pass and White Pass have a 45 to 65 percent chance of 2
feet of snow from Tuesday through Thursday night, while Santiam
Pass has a 30 percent chance of 2 feet of snow in the same period.
This precipitation will lead to river rises and potential additional
flooding on the Yakima and Naches Rivers as well as an increased
risk of rock and mud slides in areas of steep terrain and near
burn scars. However, the transition to snow is expected to keep
flooding at lower levels than the past few days. While the Yakima
and Naches Rivers are forecast to reach minor flood stage by
Tuesday and Wednesday, other rivers in the area are expected to
remain below bankfull. Also, windy conditions are expected Tuesday
night and Wednesday which may lead to difficult mountain driving
conditions. Those living or having travel plans through the
Cascades should be prepared for impactful weather next week.

$$

Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
722 PM MST Fri Dec 12 2025

IDZ012-014-016-033-ORZ061>064-132200-
/O.CON.KBOI.AS.Y.0004.000000T0000Z-251215T1200Z/
Lower Treasure Valley-Upper Treasure Valley-Western Magic Valley-
Upper Weiser River-Harney County-Baker County-Malheur County-
Oregon Lower Treasure Valley-
Including the cities of New Princeton, Buchanan, Mesa, Malheur
City, Twin Falls, Crane, Council, Caldwell, Glendale, Baker,
Indian Valley, Ontario, Nyssa, Goodrich, Dunnean, Cambridge,
Nampa, Burns, Diamond, Fruitvale, Boise, and Venator
722 PM MST Fri Dec 12 2025 /622 PM PST Fri Dec 12 2025/

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST /4 AM
PST/ MONDAY...

* 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.

* WHERE...Portions of south central and southwest Idaho and
  northeast and southeast Oregon.

* WHEN...Until 5 AM MST /4 AM PST/ Monday.

* IMPACTS...Poor air quality may cause issues for people with
  respiratory problems.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Persons with respiratory illness should follow their physicians
advice for dealing with high levels of air pollution during periods
of stagnant air.

&&

$$

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