West Coast Atmospheric River
Feb 2–5, 2025 · WPC Storm Summaries · Ended
- California
- Idaho
- Montana
- Nevada
- Oregon
- Washington
Summaries
7 summaries
First Feb 2, 03:00 PM UTC · latest Feb 5, 02:54 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 #7 · final
Feb 5, 02:54 PM UTC
Multi-day atmospheric river event comes to an end for the western U.S
Full text
ACUS45 KWBC 051454 SCCNS5 Storm Summary Number 7 for West Coast Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Wed Feb 05 2025 ...Multi-day atmospheric river event comes to an end for the western U.S... Winter Storm Warnings are in effect across portions of the northern California/southern Oregon Coastal Ranges, central/southern Sierra Nevada and portions of northeastern Oregon into the northern Rockies. Winter Weather Advisories are in effect across northwestern California and western Oregon. Flood Watches and Flood Warnings are in effect over portions of north-central California. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...regional radar imagery and surface observations showed light rain and high elevation snow lingering across the southern Sierra Nevada into southern California as a cold front moves through the region. Scattered rain and snow showers were also occurring from northern California and western Oregon into the northern Rockies. Precipitation intensity was waning across most regions as an upper level trough and cold front move across the western U.S., and what remains of the atmospheric river was rapidly weakening. ...Selected preliminary Storm Total Snowfall in inches from 600 AM PST Fri Jan 31 through 600 AM PST Tue Feb 04... ...CALIFORNIA... DAVIS CREEK 18.0 SODA SPRINGS 16.3 KINGVALE 14.0 HEAVENLY SKI BASE 7.0 ...IDAHO... GALENA 33.0 HAILEY 3 WSW 28.0 LOST TRAIL PASS 24.0 BELLEVUE 22.0 CRATERS OF MOON 16.0 ELBA 6 NNW 14.0 ...MONTANA... COOKE CITY 32.0 PINESDALE 2 SE 24.0 LUTHER 14.0 BILLINGS 8.5 ...OREGON... ALTAMONT 9.0 ASHLAND 8.0 MEDFORD 6.0 KLAMATH FALLS 4.5 ...WASHINGTON... QUILLAYUTE 11.0 MOUNT SAINT HELEN 9.0 ILWACO 6.0 NASELLE 6.0 ...Selected preliminary Storm Total Rainfall in inches from 600 AM PST Fri Jan 31 through 600 AM PST Tue Feb 04... ...CALIFORNIA... PALMETTO 0.9 SSW 24.40 BRUSH CREEK 22.09 SWEETBRIAR 2 E 21.32 MIDDLE PEAK 17.45 BRANDY CREEK 15.04 REDDING 7.9 NNE 12.96 POTTER VALLEY 8.4 ENE 12.50 BEN LOMOND RAWS 8.01 SANTA ROSA 3.1 W 7.19 SAN FRANCISCO 4.01 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... MAMMOTH MOUNTAIN 1.7 S 139 ...NEVADA... HAWTHORNE 6.1 NW 110 Lingering areas of rain and mountain snowfall should come to an end later today across southern California and the northern Rockies with additional precipitation totals remaining light. Coastal rain and higher elevation snow showers will continue from northern California into the Pacific Northwest through Thursday morning ahead of a weakening upper level low located offshore of the Pacific Northwest. Additional rainfall up to about one inch and snowfall of 1-2 feet will be possible through Thursday morning for western portions of northern California into Oregon. While another storm system is expected to bring another round of rain and snow to California on Thursday, this next storm will not last as long, or have the same precipitation magnitude, as the mutli-day atmospheric river event that is ending today. 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. Otto $$
Summary #6
Feb 5, 03:15 AM UTC
Heavy rain and snow are ongoing from central California to the northern Rockies as a cold front begins to push eastward across the west coast
Full text
ACUS45 KWBC 050315 SCCNS5 Storm Summary Number 6 for West Coast Atmospheric River NWS Weather Prediction Center College Park MD 700 PM PST Tue Feb 04 2025 ...Heavy rain and snow are ongoing from central California to the northern Rockies as a cold front begins to push eastward across the west coast... Flood Watches and Flood Warnings are in effect over portions of north-central California. Winter Storm Warnings are in effect across the Cascades, Sierra Nevada, portions of Oregon and into the northern Rockies. Winter Weather Advisories are in effect across northern California. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 PM PST...Regional radar and surface observations showed a band of widespread moderate to heavy rain pushing southeastward across central California and the Sierra Nevada to south of the Bay Area along a cold front that is starting to push through the region. Far northern California and southern Oregon are seeing moderate snowfall and the northern Rockies continue to see moderate to heavy snowfall as a moist air mass interacts with a stalled Arctic frontal boundary draped in the region. ...Selected preliminary Storm Total Snowfall in inches from 600 AM PST Fri Jan 31 through 600 PM PST Tue Feb 04... ...CALIFORNIA... DAVIS CREEK 18.0 SODA SPRINGS 16.0 KINGVALE 14.0 HEAVENLY SKI BASE 7.0 ...IDAHO... GALENA 33.0 HAILEY 3 WSW 28.0 LOST TRAIL PASS 24.0 BELLEVUE 22.0 CRATERS OF MOON 16.0 ELBA 6 NNW 14.0 ...MONTANA... COOKE CITY 32.0 LUTHER 14.0 BILLINGS 8.5 ...OREGON... ALTAMONT 9.0 ASHLAND 8.0 MEDFORD 6.0 KLAMATH FALLS 4.5 ...WASHINGTON... QUILLAYUTE 11.0 MOUNT SAINT HELEN 9.0 ILWACO 6.0 NASELLE 6.0 ...Selected preliminary Storm Total Rainfall in inches from 600 AM PST Fri Jan 31 through 600 PM PST Tue Feb 04... ...CALIFORNIA... PALMETTO 0.9 SSW 22.80 SWEETBRIAR 2 E 21.32 BRUSH CREEK 20.41 MIDDLE PEAK 16.06 BRANDY CREEK 15.04 REDDING 9.28 BEN LOMOND RAWS 8.01 SANTA ROSA 6.62 SAN FRANCISCO 3.83 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... MAMMOTH MOUNTAIN 1.7 S 139 ...NEVADA... HAWTHORNE 6.1 NW 110 Moderate to heavy rain and mountain snowfall should begin to wind down tonight into Wednesday for most of California and southern Oregon as the cold front passes through the region. An additional 1-2 inches of rain is possible over the next 12 hours along coastal areas and down into southern California as the boundary moves through. The Sierra Nevada mountain range may see 3-4 inches of precipitation in the form of rain and snow as a heavier band of precipitation was moving through the region as of this evening. The northern Rockies will continue to see the chances of heavy to moderate snow for the day Wednesday. Some wind gusts in the 20-30 mph range are also possible in California as the system moves through the area. 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. Wilder $$
Summary #5
Feb 4, 03:11 PM UTC
Heavy rain and mountain snow continue over central and northern California due to long duration atmospheric river
Full text
ACUS45 KWBC 041511 SCCNS5 Storm Summary Number 5 for West Coast Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Tue Feb 04 2025 ...Heavy rain and mountain snow continue over central and northern California due to long duration atmospheric river... Winter Storm Warnings are in effect across the Cascades, Sierra Nevada, portions of Oregon and into the northern Rockies. Winter Weather Advisories are in effect across northern California. Flood Watches are in effect over portions of north-central California. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...Regional radar and surface observations showed widespread moderate to heavy rain and mountain snow associated with an atmospheric river streaming inland across north-central California and into the northern Rockies. Precipitation was focused along and just ahead of a quasi-stationary frontal boundary that extended across northern California into the northern Great Basin. ...Selected preliminary Storm Total Snowfall in inches from 600 AM PST Fri Jan 31 through 600 AM PST Tue Feb 04... ...CALIFORNIA... DAVIS CREEK 18.0 HEAVENLY SKI BASE 7.0 ...IDAHO... GALENA 33.0 HAILEY 3 WSW 28.0 LOST TRAIL PASS 24.0 BELLEVUE 22.0 CRATERS OF MOON 16.0 ELBA 6 NNW 14.0 ...MONTANA... COOKE CITY 32.0 ...OREGON... ALTAMONT 9.0 ASHLAND 8.0 MEDFORD 6.0 KLAMATH FALLS 4.5 ...WASHINGTON... NASELLE 3.5 ...Selected preliminary Storm Total Rainfall in inches from 600 AM PST Fri Jan 31 through 600 AM PST Tue Feb 04... ...CALIFORNIA... PALMETTO 0.9 SSW 20.72 SWEETBRIAR 2 E 18.72 HILLCREST 1.3 E 12.92 BRUSH CREEK RANGER STATION 12.81 STORRIE 10.92 FOUR TREES 9.88 ANGELO COAST RANGE RESERVE 9.80 REDDING 7.9 NNE 9.80 RUTH 9.04 BLUE CANYON 7.22 VENADO 6.56 ...OREGON... O'BRIEN 3.10 BROOKINGS 2.67 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... MAMMOTH MOUNTAIN 1.7 S 139 ...NEVADA... HAWTHORNE 6.1 NW 110 Moderate to heavy rain and mountain snowfall will continue through Wednesday as an atmospheric river continues to take aim at central and northern California, leading to additional rainfall amounts of 2-4 inches for the Coastal Ranges and at least another 3 to 5 inches into the upslope regions of the central and northern Sierra Nevada through Wednesday morning. These additional rainfall totals falling on top of saturated soils will maintain a threat for scattered flooding, mudslides, and debris flows across the region. Additionally, winter weather impacts will continue for the Sierra Nevada, southern Oregon, and the northern Rockies as a wave of low pressure and plume of moisture move along and ahead of the frontal boundary through Tuesday night. Some snow in the northern Rockies and Cascades across the Pacific Northwest could be locally heavy and make for difficult traveling conditions through mid-week. 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. Otto $$
Summary #4
Feb 4, 02:35 AM UTC
Heavy rain and mountain snow focusing over north-central California as an atmospheric river continues
Full text
ACUS45 KWBC 040235 SCCNS5 Storm Summary Number 4 for West Coast Atmospheric River NWS Weather Prediction Center College Park MD 700 PM PST Mon Feb 03 2025 ...Heavy rain and mountain snow focusing over north-central California as an atmospheric river continues... Winter Storm Warnings are in effect across the Cascades, Sierra Nevada, southern Oregon, and the northern Rockies. Winter Weather Advisories are in effect across northern California. Flood Watches are in effect over portions of north-central California. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 PM PST...Regional radar and surface observations depict continued widespread moderate to heavy rain and mountain snow associated with an atmospheric river streaming inland across northern California and into the northern Rockies, focused along and north of a stationary frontal boundary with embedded areas of low pressure. ...Selected preliminary Storm Total Snowfall in inches from 600 AM PST Fri Jan 31 through 600 PM PST Mon Feb 03... ...CALIFORNIA... DAVIS CREEK 18.0 HEAVENLY SKI BASE 7.0 ...IDAHO... HAILEY 28.0 GALENA 27.0 BELLEVUE 22.0 CRATERS OF MOON 16.0 ELBA 6 NNW 14.0 ...MONTANA... COOKE CITY 32.0 ...OREGON... ALTAMONT 9.0 ASHLAND 8.0 MEDFORD 6.0 KLAMATH FALLS 4.5 ...WASHINGTON... NASELLE 3.5 ...Selected preliminary Storm Total Rainfall in inches from 600 AM PST Fri Jan 31 through 600 PM PST Mon Feb 03... ...CALIFORNIA... HILLCREST 1.3 E 12.92 BRUSH CREEK RANGER STATION 12.81 STORRIE 10.92 FOUR TREES 9.88 ANGELO COAST RANGE RESERVE 9.80 REDDING 7.9 NNE 9.80 RUTH 9.04 BLUE CANYON 7.22 VENADO 6.56 ...OREGON... O'BRIEN 3.10 BROOKINGS 2.67 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... MAMMOTH MOUNTAIN 1.7 S 139 ...NEVADA... HAWTHORNE 6.1 NW 110 Moderate to heavy rain and mountain snowfall will continue through Wednesday as an atmospheric river and low pressure waves along a frontal boundary slowly sags southward in northern California, leading to additional precipitation amounts of 2-4" and 7-10" atop the California Coastal Range and northern Sierra Nevada, respectively. Scattered flooding, mudslides, and debris flows remain possible through Wednesday morning across north-central California. Additionally, there will be some winter weather impacts in the Sierra Nevada, southern Oregon, and the northern Rockies as another low pressure wave and plume of moisture move along the frontal boundary Tuesday. Some snow in the northern Rockies and Cascades across the Pacific Northwest could be locally heavy and make for difficult traveling conditions into middle week. 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. Wilder $$
Summary #3
Feb 3, 02:54 PM UTC
Heavy rain and mountain snow focusing over north-central California as an atmospheric river continues
Full text
ACUS45 KWBC 031454 SCCNS5 Storm Summary Number 3 for West Coast Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Mon Feb 03 2025 ...Heavy rain and mountain snow focusing over north-central California as an atmospheric river continues... Winter Storm Warnings are in effect across the Cascades, Sierra Nevada, and the northern Rockies. Winter Weather Advisories are in effect across northern California and southern Oregon. Flood Watches are in effect over portions of north-central California. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...Regional radar and surface observations depict continued widespread moderate to heavy rain and mountain snow associated with an atmospheric river streaming inland across northern California and into the northern Rockies, focused along and north of a stalled frontal boundary. ...Selected preliminary Storm Total Snowfall in inches from 600 AM PST Fri Jan 31 through 600 AM PST Mon Feb 03... ...CALIFORNIA... DAVIS CREEK 18.0 HEAVENLY SKI BASE 7.0 ...IDAHO... GALENA 27.0 ELBA 6 NNW 14.0 ...MONTANA... COOKE CITY 32.0 ...OREGON... KLAMATH FALLS 4.5 ...Selected preliminary Storm Total Rainfall in inches from 600 AM PST Fri Jan 31 through 600 AM PST Mon Feb 03... ...CALIFORNIA... BRUSH CREEK RANGER STATION 12.81 FOUR TREES 9.88 ANGELO COAST RANGE RESERVE 9.80 REDDING 7.9 NNE 9.80 RUTH 9.04 HILLCREST 1.3 E 8.72 STORRIE 8.52 BLUE CANYON 7.22 VENADO 6.56 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... MAMMOTH MOUNTAIN 1.7 S 139 ...NEVADA... HAWTHORNE 6.1 NW 110 Moderate to heavy rain and mountain snowfall will continue through Wednesday as an atmospheric river and a frontal boundary slowly sags southward in northern California, leading to additional precipitation amounts of 2-4" and 7-10" atop the California Coastal Range and northern Sierra Nevada, respectively. Scattered flooding, mudslides, and debris flows remain possible through Wednesday morning across north-central California. Additionally, moisture from the atmospheric river will continue inland across the northern Rockies in the form of locally heavy snow and make for difficult traveling conditions into the early week. 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. Asherman $$
Summary #2
Feb 3, 02:55 AM UTC
Heavy rain and mountain snow focusing over north-central California as an atmospheric river continues
Full text
ACUS45 KWBC 030255 SCCNS5 Storm Summary Number 2 for West Coast Atmospheric River NWS Weather Prediction Center College Park MD 700 PM PST Sun Feb 02 2025 ...Heavy rain and mountain snow focusing over north-central California as an atmospheric river continues... Winter Storm Warnings are in effect across the Cascades, Sierra Nevada, and the northern Rockies. Winter Weather Advisories are in effect across northern California and southern Oregon. Flood Watches are in effect over portions of north-central California. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 PM PST...Regional radar and surface observations depict continued widespread moderate to heavy rain and mountain snow associated with an atmospheric river streaming inland across northern California and into the northern Rockies, focused along and north of a stalled frontal boundary in the region. ...Selected preliminary Storm Total Snowfall in inches from 600 AM PST Fri Jan 31 through 600 PM PST Sun Feb 02... ...CALIFORNIA... DAVIS CREEK 18.0 DORIS 6.0 ...IDAHO... HAILEY 8.0 W VICTOR 5.6 ...MONTANA... COOKE CITY 32.0 ...OREGON... KLAMATH FALLS 4.5 ...Selected preliminary Storm Total Rainfall in inches from 600 AM PST Fri Jan 31 through 600 PM PST Sun Feb 02... ...CALIFORNIA... FOUR TREES 9.88 HILLCREST 2 E 8.92 STORRIE 8.52 BRUSH CREEK RANGER STATION 8.30 BLUE CANYON 7.22 REDDING 6.63 ANGELO COAST RANGE RESERVE 6.30 BOWMAN LAKE NEAR GRANITEVILLE 5W 6.14 Moderate to heavy rain and mountain snowfall will continue through Wednesday as an atmospheric river and a frontal boudary slowly sags southward in northern California, leading to additional precipitation amounts of 2-4" and 7-10" atop the California Coastal Range and northern Sierra Nevada, respectively. Scattered flooding, mudslides, and debris flows remain possible through Wednesday morning across north-central California. Additionally, moisture from the atmospheric river will continue inland across the northern Rockies in the form of locally heavy snow and make for difficult traveling conditions into the early week. 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. Wilder $$
Summary #1
Feb 2, 03:00 PM UTC
Steady rain and mountain snow focusing over north-central California as an atmospheric river continues
Full text
ACUS45 KWBC 021500 SCCNS5 Storm Summary Number 1 for West Coast Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Sun Feb 02 2025 ...Steady rain and mountain snow focusing over north-central California as an atmospheric river continues... Flood Watches are in effect over portions of north-central California. Winter Storm Warnings are in effect across the northern Cascades. Winter Storm Watches are in effect across the Sierra Nevada. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...Regional radar and surface observations depict widespread moderate to heavy rain and mountain snow associated with an atmospheric river streaming inland across north-central California, along a stalled frontal boundary. ...Selected preliminary Storm Total Rainfall in inches from 600 AM PST Fri Jan 31 through 600 AM PST Sun Feb 02... ...CALIFORNIA... HILLCREST 2 E 8.92 BRUSH CREEK RANGER STATION 8.30 ANGELO COAST RANGE RESERVE 6.30 BOWMAN LAKE NEAR GRANITEVILLE 5W 6.14 REDDING 7.9 NNE 5.51 MAD RIVER 12 SE 5.36 SRFD WHITE OAK DRIVE 4.58 SAN FRANCISCO INTL AIRPRT 0.30 ...OREGON... BROOKINGS 4.2 ENE 3.49 Steady moderate to heavy rain and mountain snowfall will continue through Wednesday as atmospheric river conditions continue, leading to additional precipitation amounts of 4-7" and 7-12" atop the California Coastal Range and northern Sierra Nevada, respectively. Scattered flooding, mudslides, and debris flows remain possible through Wednesday morning across north-central California. 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. Asherman $$
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.
California
Nevada
Washington
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.