827
ACUS43 KWBC 111544
SCCNS3
STORM SUMMARY NUMBER 03 FOR ATMOSPHERIC RIVER CAUSING HEAVY
RAINFALL FOR PACIFIC NORTHWEST AND INTERMOUNTAIN WEST
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
700 AM PST THU DEC 11 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.
FOR A DETAILED GRAPHICAL DEPICTION OF THE LATEST WATCHES, WARNINGS
AND ADVISORIES, PLEASE SEE WWW.WEATHER.GOV
AT 600 AM PST...SURFACE OBSERVATIONS AND THE ANALYSIS SHOWS A
STATIONARY FRONT ACROSS THE PACIFIC NORTHWEST. 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 ARE ALSO OCCURRING THROUGHOUT AREAS
OF THE INTER-MOUNTAIN WEST.
...SELECTED PRELIMINARY STORM TOTAL RAINFALL IN INCHES FROM 700 AM
PST MON DEC 08 THROUGH 600 AM 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
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
PARADISE 14.15
GRISDALE 7 WNW 13.92
SKYKOMISH 1 E 13.40
CEDAR FALLS 3 NE 13.38
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
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 THROUGH TODAY 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 SEVERAL MORE INCHES OF RAIN ARE POSSIBLE TODAY. 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 TODAY ACROSS WASHINGTON AND BY FRIDAY FOR IDAHO AND
MONTANA.
THE NEXT STORM SUMMARY WILL BE ISSUED BY THE WEATHER PREDICTION
CENTER AT 700 PM PST. PLEASE REFER TO YOUR LOCAL NATIONAL WEATHER
SERVICE OFFICE FOR ADDITIONAL INFORMATION ON THIS EVENT.
ZIEGENFELDER
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