Storm Summary Number 02 for Atmospheric River Causing Heavy
Rainfall for Pacific Northwest and Intermountain West
NWS Weather Prediction Center College Park MD
1000 PM EST Wed Dec 10 2025

...An atmospheric river is bringing heavy rainfall across the
Pacific Northwest, Idaho, and northwestern Montana. 

Flood Warnings are in effect for for multiple streams and rivers
in Washington, Idaho, and northwestern Montana.

A Flood Watch in is effect for the Olympics and Cascades of
Washington and portions of northern Idaho and northwest Montana.

An Avalanche Warning is in effect for portions of northern Idaho
and northwestern Montana.

For a detailed graphical depiction of the latest watches, warnings
and advisories, please see www.weather.gov

At 900 PM EST...surface observations and the analysis shows a warm
front lifting across the Pacific Northwest and a cold front
nearing coastal Washington. Mosaic radar depicts moderate rainfall
falling across the Pacific Northwest and Inter-Mountain West as
the stream of moisture from the atmospheric river continues. Most
of the heaviest rainfall is concentrated in the Olympics,
Cascades, Bitterroots, and northern Rocky mountain ranges. Gusty
to strong winds may also occur throughout areas in the
Inter-Mountain West. 

...Selected preliminary Storm Total Rainfall in inches from 700 AM
EST Mon Dec 08 through 900 PM EST Wed Dec 10...

...IDAHO...
KELLY                                4.72                    
FISH HOOK                            4.32                    
MOOSE CREEK                          3.48                    
POWELL                               3.46                    
MAGEE PEAK                           2.91                    
HEMLOCK BUTTE                        2.50                    
LOWELL                               2.20                    

...MONTANA...
SEELEY LAKE                          2.84                    
BC BALDY                             2.48                    
SMITH CREEK                          2.36                    
BENCHMARK                            2.29                    

...WASHINGTON...
QUINAULT                            15.04                    
HUMPTULLIPS                         11.98                    
OHANAPECOSH                         11.80                    
OWL MT                              11.18                    
JOHNSON RIDGE                        9.65                    
THREE CORNER ROCK                    8.91                    
HUCKLEBERRY RIDGE                    8.35                    
HAGER CREEK                          8.26                    
VIEWPOINT                            7.82                    
DRY CREEK                            7.79                    
ROSLYN 11WNW                         6.64                    
PARADISE                             6.30                    
CANYON CREEK                         5.89                    
LITTLEROCK 3N                        5.20                    
SATSOP RIVER 13NW                    5.02                    
TOUCHET                              4.20                    

...Selected preliminary Peak Wind gusts in miles per hour earlier
in the event...

...IDAHO...
BAYVIEW SHOSHONE 13 ESE                56                    
COLBURN 5 WSW                          56                    
POST FALLS                             56                    

...MONTANA...
LIVINGSTON 7 ENE                       72                    
WASHOE 13 SW                           66                    
WILSALL 17 NE                          66                    
MELVILLE 3 NE                          59                    
PRAY 2 S                               56                    

...WASHINGTON...
CRYSTAL MOUNTAIN 3 SSW                108                    
TELMA 1 NNE                           106                    
LEAVENWORTH 3 NW                       77                    
PEOLA 3 SSW                            60                    
DODGE 3 E                              57                    

...Selected preliminary Storm Total Rainfall in inches where the
event has ended...

...OREGON...
YELLOWSTONE MOUNTAIN                 8.29                    
LOG CREEK                            7.98                    
SOUTH FORK                           7.61                    
CEDAR                                6.65                    
KOSMOS                               5.87                    
CANNIBAL MOUNTAIN                    5.02                    
BOULDER CREEK                        4.46                    
MILK SHAKES                          3.90                    
ELGIN 15NNW                          2.20                    
GLADSTONE 1NNW                       1.66                    


Locally heavy rainfall is likely to continue tonight into tomorrow
across Washington State, Idaho, and western Montana. Moisture with
the atmospheric river will continue to promote chances for
flooding, especially in upslope mountain ranges of the Olympics
and Cascades where another 3-6 inches may accumulate in the next
24 hours. The mountain ranges in Idaho and western Montana may see
another 2-3 inches of rainfall with locally higher amounts
possible as rain is likely to continue through Friday in this
region. Significant river flooding is ongoing and will be a hazard
as water levels crest well above flood stage, even into record
stage, across the Pacific Northwest and Intermountain-West. The
atmospheric river should begin to weaken by late tomorrow across
Washington and by Friday for Idaho and Montana. 

The next Storm Summary will be issued by the Weather Prediction
Center at 1000 AM EST. Please refer to your local National Weather
Service office for additional information on this event.

Wilder