Atmospheric River Causing Heavy Rainfall for Pacific Northwest and Intermountain West
Dec 10–12, 2025 · WPC Storm Summaries · Ended
- Idaho
- Montana
- Oregon
- Washington
Summaries
5 summaries · 2 corrections
First Dec 10, 08:25 PM UTC · latest Dec 12, 02:38 PM UTC
Source
NOAA Weather Prediction Center
Station values in WPC's text are preliminary
WPC outlooks as they stood at each summary
Not captured: this event's summaries were imported from the archive after they were issued, so the outlooks in effect at the time were not recorded. Events summarised since show the Excessive Rainfall Outlook and WSSI ice impacts as they stood at each summary.
Storm summaries
Summary #5 · final
Dec 12, 02:38 PM UTC · corrects 2 earlier issuances
Heavy rainfall tapering off across the Pacific Northwest, northern Idaho and northwestern Montana, but flooding concerns remain
Full text
ACUS43 KWBC 121438 SCCNS3 Storm Summary Number 05 for Atmospheric River Causing Heavy Rainfall for Pacific Northwest and Intermountain West NWS Weather Prediction Center College Park MD 700 AM PST Fri Dec 12 2025 ...Heavy rainfall tapering off across the Pacific Northwest, northern Idaho and northwestern Montana, but flooding concerns remain... Flood Warnings and Flash Flood Watches are in effect through Friday evening 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. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...Surface observations showed the heavy rain over the Northwest has come to and end. Mosaic radar and surface observations depicted mostly light rainfall lingering across across parts of northern Idaho and northwestern Montana. ...Selected preliminary Storm Total Rainfall in inches from 700 AM PST Sat Dec 06 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... 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 The atmoshereic river into the Northwest has come to an end. Scatterd rain showers will develop over the region through the weekend. This wil be the last Storm Summary for this storm. This will be the last Storm Summary issued by the Weather Prediction Center for this event. Please refer to your local National Weather service office for additional information. Ziegenfelder $$
Superseded version, Dec 12, 02:34 PM UTC
ACUS43 KWBC 121434 SCCNS3 Storm Summary Number 05 for Atmospheric River Causing Heavy Rainfall for Pacific Northwest and Intermountain West NWS Weather Prediction Center College Park MD 700 AM PST Fri Dec 12 2025 ...Heavy rainfall tapering off across the Pacific Northwest, northern Idaho and northwestern Montana, but flooding concerns remain... Flood Warnings and Flash Flood Watches are in effect through Friday evening 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. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...Surface observations showed the heavy rain over the Northwest has come to and end. Mosaic radar and surface observations depicted mostly light rainfall lingering across across parts of northern Idaho and northwestern Montana. ...Selected preliminary Storm Total Rainfall in inches from 700 AM PST Sat Dec 06 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... 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 The atmoshereic river into the Northwest has come to an end. Scatterd rain showers will develop over the region through the weekend. This wil be the last Storm Summary for this storm. This will be the last Storm Summary issued by the Weather Prediction Center for this event. Please refer to your local National Weather service office for additional information. Ziegenfelder $$
Superseded version, Dec 12, 02:30 PM UTC
ACUS43 KWBC 121430 SCCNS3 Storm Summary Number 05 for Atmospheric River Causing Heavy Rainfall for Pacific Northwest and Intermountain West NWS Weather Prediction Center College Park MD 700 AM PST Fri Dec 12 2025 ...Heavy rainfall tapering off across the Pacific Northwest, northern Idaho and northwestern Montana, but flooding concerns remain... Flood Warnings and Flash Flood Watches are in effect through Friday evening 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. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...Surface observations showed the heavy rain over the Northwest has come to and end. Mosaic radar and surface observations depicted mostly light rainfall lingering across across parts of northern Idaho and northwestern Montana. ...Selected preliminary Storm Total Rainfall in inches from 700 AM PST Sat Dec 06 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... 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 The atmoshereic river into the Northwest has come to an end. Scatterd rain showers will develop over the region through the weekend. This wil be the last Storm Summary for this storm. This will be the last Storm Summary issued by the Weather Prediction Center for this event. Please refer to your local National Weather service office for additional information. Ziegenfelder $$
Summary #4
Dec 12, 02:48 AM UTC
Heavy rainfall tapering off across the Pacific Northwest, northern Idaho and northwestern Montana, but flooding concerns remain
Full text
ACUS43 KWBC 120248 SCCNS3 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 $$
Summary #3
Dec 11, 03:44 PM UTC
An atmospheric river is bringing heavy rainfall across the Pacific Northwest, Idaho, and northwestern Montana.
Full text
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 $$
Summary #2
Dec 11, 03:08 AM UTC
An atmospheric river is bringing heavy rainfall across the Pacific Northwest, Idaho, and northwestern Montana.
Full text
ACUS43 KWBC 110308 SCCNS3 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 $$
Summary #1
Dec 10, 08:25 PM UTC
Issued as “Atompspheric River causing Heavy Rainfall for Pacific Northwest and Intermountain West”
An atomspheric river is causing heavy rainfall across Washington, Oregon and into Idaho and Montana
Full text
ACUS43 KWBC 102025 SCCNS3 Storm Summary Number 01 for Atompspheric River causing Heavy Rainfall for Pacific Northwest and Intermountain West NWS Weather Prediction Center College Park MD 400 PM EST Wed Dec 10 2025 ...An atomspheric river is causing heavy rainfall across Washington, Oregon and into Idaho and Montana... Flood Warnings are in effect for for multiple streams in Washington and Oregon. A Flood Watch in is effect for the Olympics and Cascades of Washington and Oregon and for portions of northeast Washington, northern Idaho and northwest Montana. Coastal Flood Advisories are in effect for Washington and Oregon. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 300 PM EST...Stratiform rainfall is expanding across much of western Washington along and south of slow moving front draped over the Pacific Ocean and near the Washington/British Columbia border. The atmospheric river is tapping into tropical mositure from near Hawaii which is causing local enhancements, especially near the higher terrain. ...Selected preliminary Storm Total Rainfall in inches from 700 AM EST Mon Dec 08 through 300 PM EST Wed Dec 10... ...IDAHO... KELLY 2.84 MOOSE CREEK 2.54 HEMLOCK BUTTE 2.50 LOWELL 2.20 ...MONTANA... SMITH CREEK 2.36 ...OREGON... CEDAR 6.65 YELLOWSTONE MOUNTAIN 5.48 MILK SHAKES 3.90 LOG CREEK 3.05 ELGIN 15NNW 2.20 ...WASHINGTON... ROSLYN 11WNW 6.64 OHANAPECOSH 6.46 PARADISE 6.30 LITTLEROCK 3N 5.20 HUMPTULLIPS 5.12 SATSOP RIVER 13NW 5.02 TOUCHET 4.20 STEVENS PASS 4.10 OWL MT 4.01 JUNE LAKE 3.80 JOHNSON RIDGE 3.65 CHEWELAH 1W 2.80 WHITE SALMON 18N 2.80 CLE ELUM 9E 2.68 ...Selected preliminary Storm Total Rainfall in inches where the event has ended... ...OREGON... GLADSTONE 1NNW 1.66 The atmospheric river is expected to continue to bring scattered to widespread heavy rain from the Pacific Northwest eastward to the portions of Idaho and western Montana through Thursday. Moderate to major flooding to continue through at least Thursday. The next Storm Summary will be issued by the Weather Prediction Center at 1000 PM EST. Please refer to your local National Weather Service office for additional information on this event. Campbell $$
Forecast offices in the affected states
By the states WPC's summaries list. Each office page has its active alerts and latest Area Forecast Discussion.
Text: NOAA/NWS Weather Prediction Center Storm Summaries, shown verbatim. Grouping the summaries into one event, the outlook copies and the links are Stormlio's; WPC issues no event id. Station values are preliminary; the official record is NCEI Storm Data.