Storm Summary Number 04 for Atmospheric River Causing Heavy
Rainfall for Pacific Northwest and Intermountain West
NWS Weather Prediction Center College Park MD
700 PM PST Thu Dec 11 2025

...Heavy rainfall tapering off across the Pacific Northwest,
northern Idaho and northwestern Montana, but flooding concerns
remain...

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

A Flash Flood Watch is in effect for northern portions of the
Puget Lowland.

Flood Watches are in effect for the Olympics and Cascades of
Washington.

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

At 600 PM PST...Surface observations showed a warm front extending
from the eastern Pacific into southwestern Washington, slowly
lifting north. Mosaic radar and surface observations depicted
mostly light with occasional moderate rainfall falling across
western Washington into downstream portions of northern Idaho and
northwestern Montana, in association with the lingering
atmospheric river.

...Selected preliminary Storm Total Rainfall in inches from 700 AM
PST Sat Dec 06 through 600 PM PST Thu Dec 11...

...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...
KOOTENAI FALLS 8 SSW                 5.62                    
NOXON 12 NE                          5.00                    
SEELEY LAKE                          2.84                    
BC BALDY                             2.48                    
SMITH CREEK                          2.36                    
BENCHMARK                            2.29                    

...WASHINGTON...
QUINAULT                            16.58                    
MOUNT OLYMPUS 12 W                  14.44                    
OWL MT                              14.44                    
OHANAPECOSH                         14.15                    
PARADISE                            14.15                    
GRISDALE 7 WNW                      13.92                    
SKYKOMISH 1 E                       13.40                    
CEDAR FALLS 3 NE                    13.38                    
HUMPTULLIPS                         11.98                    
TOMS CREEK                          11.07                    
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                    
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...
EMIGRANT (AVALANCHE) 11 W              88                    
DEEP CREEK                             86                    
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                    


Additional light to occasionally moderate rainfall will continue
across western Washington into the northern Rockies of Idaho and
northwestern Montana. Additional peak rainfall totals of about an
inch (locally higher) are expected through Friday morning with
light rain contiuning through the day. The atmospheric river will
continue to lift north and weaken over the next 24 hours but
impacts from ongoing moderate to major river flooding will
continue with some rivers yet to crest. A break from rainfall will
occur for the northwestern U.S., but more rainfall is in the
forecast beginning Saturday night across western Washington.

The next Storm Summary will be issued by the Weather Prediction
Center at 700 AM PST. Please refer to your local National Weather
Service office for additional information on this event.

Otto