WWA Summary for Flood Watch Issued by BOI

Flood Watch

Flood Watch
National Weather Service Pendleton OR
202 PM PST Tue Dec 9 2025

WAZ026-027-521>523-110015-
/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 Easton, Appleton, Roslyn, Naches,
Sunnyside, Bickleton, Yakima, Thorp, Cle Elum, Ellensburg,
Cliffdell, Goldendale, and Toppenish
202 PM PST Tue Dec 9 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.
  - http://www.weather.gov/safety/flood

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.

&&

$$

CE

Flood Watch
National Weather Service Missoula MT
1253 PM MST Mon Dec 8 2025

.Near-record precipitation is possible this week as two Atmospheric
Rivers will move through the region. The first one arrives today and
continues through Tuesday, followed by a second, stronger one
Tuesday night through Thursday. Between 4 and 10 inches of moderate
to heavy rain are expected in the mountains. For some locations,
near record rainfall amounts are possible. The rain, falling on the
current snowpack, combined with mild nighttime temperatures will
increase snowmelt. Flows in rivers may increase quickly and reach
critical levels.

IDC035-049-092115-
/O.EXT.KMSO.FA.A.0009.251209T0000Z-251212T0000Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clearwater-Idaho-
1253 PM MST Mon Dec 8 2025 /1153 AM PST Mon Dec 8 2025/

...FLOOD WATCH NOW IN EFFECT FROM 5 PM MST /4 PM PST/ THIS AFTERNOON
THROUGH THURSDAY AFTERNOON...

* WHAT...Flooding caused by rain and snowmelt continues to be
  possible.

* WHERE...Portions of central and panhandle Idaho, including the
  following counties, in central Idaho, Idaho. In panhandle Idaho,
  Clearwater.

* WHEN...From 5 PM MST  /4 PM PST/ this afternoon through Thursday
  afternoon.

* IMPACTS...Creeks and streams may rise out of their banks. Flooding
  may occur in poor drainage and urban areas. Storm drains and
  ditches may become clogged with debris. People, structures, and
  roads located below steep slopes, in canyons, and near the mouths
  of canyons may be at risk from landslides.

* ADDITIONAL DETAILS...
  - A prolonged atmospheric river is expected to bring periods of
    heavy rain to Idaho and Clearwater Counties, Monday night
    through Thursday. Rising snow levels will lead to a rain on
    snow event for elevations below 7,000 feet Monday night into
    Tuesday morning. The precipitation rates will briefly
    decrease Tuesday afternoon, before a second surge of moisture
    arrives Tuesday night into Thursday morning with snow levels
    rising to near 8,000 feet. By Thursday, significant
    precipitation totals are forecast, with 2 to 5 inches in the
    valleys and 5 to 10 inches in the mountains, with locally
    higher totals over mountain crests. Landslides in areas of
    steep terrain and minor flooding in urban and poor drainage
    areas is possible.
  - https://www.weather.gov/mso/hydrology

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. Monitor basements for water
intrusion. You may want to preemptively shovel snow away from your
home.

&&

$$