WWA Summary for All Issued by BOI

Wind Advisory

URGENT - WEATHER MESSAGE
National Weather Service Pendleton OR
1110 AM PST Wed Dec 10 2025

ORZ041-044-507-508-510-WAZ024-027-029-521-111500-
/O.CON.KPDT.WI.Y.0031.000000T0000Z-251211T1500Z/
Eastern Columbia River Gorge of Oregon-Lower Columbia Basin of
Oregon-Foothills of the Northern Blue Mountains of Oregon-
Foothills of the Southern Blue Mountains of Oregon-North Central
Oregon-Eastern Columbia River Gorge of Washington-Yakima Valley-
Foothills of the Blue Mountains of Washington-Simcoe Highlands-
Including the cities of Condon, Bickleton, Toppenish, Arlington,
Pilot Rock, Pendleton, Moro, Boardman, Maupin, Ione, Goldendale,
Waitsburg, Sunnyside, Hermiston, The Dalles, Fossil, Yakima,
White Salmon, Heppner, Dayton, Dufur, Athena, Naches, and Walla
Walla
1110 AM PST Wed Dec 10 2025

...WIND ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST THURSDAY...

* WHAT...Southwest winds 25 to 35 mph with gusts up to 55 mph.

* WHERE...Foothills of the Blue Mountains of Oregon and Washington,
  Eastern Columbia River Gorge of Oregon and Washington, Lower
  Columbia Basin of Oregon, North Central Oregon, Yakima Valley, and
  Simcoe Highlands.

* WHEN...Until 7 AM PST Thursday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.

&&

$$

MD

Flood Watch

Flood Watch
National Weather Service Pendleton OR
113 PM PST Wed Dec 10 2025

WAZ026-027-521>523-111530-
/O.CON.KPDT.FA.A.0002.000000T0000Z-251212T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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 Cle Elum, Cliffdell, Appleton, Thorp,
Ellensburg, Yakima, Easton, Bickleton, Toppenish, Roslyn, Naches,
Goldendale, and Sunnyside
113 PM PST Wed Dec 10 2025

...FLOOD WATCH REMAINS IN EFFECT THROUGH FRIDAY MORNING...

* WHAT...Flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Portions of central and south central Washington,
  including the following areas, in central Washington, Kittitas
  Valley, Simcoe Highlands and Yakima Valley. In south central
  Washington, Lower Slopes of the Eastern Washington Cascades Crest
  and Upper Slopes of the Eastern Washington Cascades Crest.

* WHEN...Through Friday morning.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Creeks and streams may rise out of their banks. Low-water
  crossings may be flooded. Area creeks and streams are running high
  and could flood with more heavy rain.

* ADDITIONAL DETAILS...
  - Flooding has already been reported along the Naches and
    Yakima Rivers. More rain is expected to occur through the
    week, with heavy rain expected to fall over the Cascades the
    remainder of Tuesday into Wednesday.
  - Go to http://www.weather.gov/safety/flood for flood safety
    tips and resources.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.

&&

$$

MD

Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
130 PM MST Wed Dec 10 2025

IDZ012-014-016-033-ORZ061>064-111200-
/O.NEW.KBOI.AS.Y.0004.251212T1200Z-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 Cambridge, Goodrich, Buchanan, Nyssa,
Boise, Ontario, Baker, Venator, Malheur City, Caldwell, Nampa,
Twin Falls, Mesa, Glendale, Burns, Crane, New Princeton, Indian
Valley, Dunnean, Diamond, Council, and Fruitvale
130 PM MST Wed Dec 10 2025 /1230 PM PST Wed Dec 10 2025/

...AIR STAGNATION ADVISORY IN EFFECT FROM 5 AM MST /4 AM PST/ FRIDAY
TO 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...From 5 AM MST /4 AM PST/ Friday to 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.

&&

$$

JY

Hydrologic Outlook

Hydrologic Outlook
IDC049-120700-

Hydrologic Outlook
National Weather Service Missoula MT
1233 PM MST Wed Dec 10 2025

The flood watch has been cancelled, but hydrologic impacts remain a
minor threat through Friday morning. The break in the rain is
allowing creeks and streams to flush out and build capacity for the
next round of moisture tomorrow. This next round will still cause an
increased risk of rock falls and some ponding of water in low lying
areas.

Warm overnight temperatures will cause some snow melt in addition to
another round of rain coming in. So further stream and river rises
are expected, but at this time we do not expect further rises to
measure up to the level of floods.
$$