California Atmospheric River
Dec 22–27, 2025 · WPC Storm Summaries · Ended
- California
- Nevada
Summaries
11 summaries · 1 correction
First Dec 22, 02:54 AM UTC · latest Dec 27, 02:38 AM 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 #12 · final
Dec 27, 02:38 AM UTC
Heavy precipitation forecast to gradually come to an end tonight
Full text
ACUS45 KWBC 270238 SCCNS5 Storm Summary Number 12 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 PM PST Fri Dec 26 2025 ...Heavy precipitation forecast to gradually come to an end tonight... Winter Storm Warnings are in effect for the Sierra Nevada and into the interior higher elevations of northern California. Flood Watches remain in effect for portions of the California Coast. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 PM PST...Precipitation coverage was gradually decreasing across California, but National Weather Service Doppler Radar and surface observations showed some lingering showers with moderate precipitation intensities. Wind gusts have also decreased to around 20-30 mph. ...Selected preliminary Storm Total Snowfall in inches from 400 PM PST Sat Dec 20 through 600 PM PST Fri Dec 26... ...CALIFORNIA... MONO CITY 1.9 SW 40.7 MAMMOTH MOUNTAIN SKI BASE 38.0 HEAVENLY SKI BASE 28.0 PALISADES TAHOE SKI BASE 27.0 LEE VINING 5 NNW 26.4 SODA SPRINGS 1 ENE 24.0 DONNER PEAK 1 W 22.0 TAHOMA .5 S 21.2 KIRKWOOD MEADOWS 1 S 20.0 ASPENDELL 18.0 TRUCKEE 5.9 ENE 14.3 KINGVALE 14.0 CISCO 2 NW 12.0 NORTHSTAR SKI BASE 12.0 PINECREST 2 E 12.0 SOUTH LAKE TAHOE 1.4 ESE 5.8 ...NEVADA... MOUNT ROSE SKI BASE 34.0 RENO 10.7 S 9.4 NEW WASHOE CITY 6.5 SW 6.5 ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 PM PST Fri Dec 26... ...CALIFORNIA... HONEYDEW 3.2 SSE 22.23 WHITETHORN 1.7 NNW 18.41 ROSE VALLEY RAWS 17.64 ORTEGA HILL 17.62 NORDHOFF RIDGE 17.56 POTTER VALLEY 8.4 ENE 17.40 CHALLENGE-BROWNSVILLE 1.3 WSW 16.51 OLD MAN MOUNTAIN 16.50 MATILIJA CANYON 16.38 ETTERSBURG 2.8 N 15.94 PINE MOUNTAIN INN 15.66 CAZADERO 5.6 W 15.32 MIDDLE FK LYTLE CREEK 14.63 BENBOW 3.8 SSE 14.54 SAN MARCOS PASS 14.46 JUNCAL DAM 14.17 PARADISE 1.2 W 13.59 CRYSTAL LAKE 13.23 DUTCH FLAT 0.7 S 13.21 LAYTONVILLE 1 SW 12.90 COGSWELL DAM 12.52 GUERNEVILLE 2.0 SSW 12.25 SAN SEVAINE 11.61 REDDING 7.9 NNE 10.80 WRIGHTWOOD FS 10.78 LYTLE CREEK RAWS 10.63 BERNINA DRIVE 10.13 PORTER RANCH RAWS 9.04 MORMON ROCK RAWS 8.77 SUMMIT VALLEY FIRE 8.66 NEWHALL 8.46 WOODLAND HILLS 8.17 MT BALDY 7.58 EUREKA 1.6 SSW 7.17 DEEP CREEK 7.09 CEDAR GLEN 6.97 TOPANGA FS 6.89 VENTURA 6.57 BEAR VALLEY 1.1 S 6.52 MORRIS DAM 6.10 EAGLE ROCK RESERVOIR 5.97 SAN FRANCISCO 3.4 S 4.81 SANTA BARBARA AIRPORT 4.52 BEL AIR 4.41 LA DOWNTOWN 4.05 BURBANK 3.99 SHAVER LAKE 3.69 UCLA 3.07 CATALINA ISLAND RAWS 2.03 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... PALISADES TAHOE AT ALPINE MEADOWS 113 MATTOLE ROAD 109 MAMMOTH MOUNTAIN 1.7 S 108 MESONET MTH03 PABLO POINT 108 MAGIC MOUNTAIN TRUCK 96 PINE MOUNTAIN FIRE ROAD 95 LONE TREE TOWERS 93 NORTH PEAK ACCESS ROAD 92 HIGH GLADE LOOKOUT 91 OLD COAST TOWER 91 WALKER 4 SSW 90 MINES TOWER 89 OAT MOUNTAIN 89 SCE WEST GRAPEVINE 89 MONO 84 NORTH RANCH 82 THOUSAND OAKS 4 ENE 82 SANTA CRUZ ISLAND 81 INYO 80 ROUND VALLEY 2 SSW 80 MILL CREEK 78 DE LA CONCEPCION 74 MAMMOTH LAKES 70 SHIP MOUNTAIN 70 TV TOWERS RD 2 70 BARLEY FLATS RD 67 CAT CANYON ROAD 64 DANGEMOND 61 PURISIMA HILLS 60 ...NEVADA... WASHOE 87 DOUGLAS 66 Precipitation will continue to taper off tonight, with improving conditions for the weekend. 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. Dolan $$
Summary #11
Dec 26, 03:11 PM UTC
Additional waves of heavy rainfall continue to lead to scattered instances of flash flooding for portions of southern California
Full text
ACUS45 KWBC 261511 SCCNS5 Storm Summary Number 11 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Fri Dec 26 2025 ...Additional waves of heavy rainfall continue to lead to scattered instances of flash flooding for portions of southern California... Winter Storm Warnings are in effect for the Sierra Nevada and into the interior higher elevations of northern California. Flood Watches remain in effect for much of California. Flood Advisories are in effect for portions of coastal California and the central valleys. Wind Advisories are in effect for portions of northern coastal California and the central valleys. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...National Weather Service Doppler Radar and surface observations indicated multiple areas of ongoing precipitation across California, including bands of moderate to heavy showers continuing to stream into southern California ahead of a cold front draped through the central Great Basin, Sierra, and to the California coast. Doppler radar also indicated moderate to heavy snow showers across the Sierra with some lingering rain showers along the foothills in the central valleys. Finally, a broad area of showers continued along upslope areas of the northern coastal ranges ahead of an area of low pressure off the coast, with a minimum central pressure of 996 mb (or 29.41 inches of mercury). Steady winds of 20-25 mph were observed across portions of northern California, especially along the coast. ...Selected preliminary Storm Total Snowfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Fri Dec 26... ...CALIFORNIA... MAMMOTH MOUNTAIN SKI BASE 38.0 MONO CITY 1.9 SW 28.3 HEAVENLY SKI BASE 28.0 PALISADES TAHOE SKI BASE 27.0 LEE VINING 5 NNW 26.4 ASPENDELL 18.0 TRUCKEE 4 NW 14.0 NORTHSTAR SKI BASE 12.0 TAHOMA 0.5 S 11.5 CARPENTER RIDGE 10.7 BEAR VALLEY 1.1 S 8.7 SOUTH LAKE TAHOE 1.4 ESE 5.8 ...NEVADA... MOUNT ROSE SKI BASE 34.0 DIAMON PEAK SNOW BASE 6.0 RENO 17.8 NNW 4.7 ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Fri Dec 26... ...CALIFORNIA... HONEYDEW 3.2 SSE 17.20 WHITETHORN 1.7 NNW 15.63 POTTER VALLEY 8.4 ENE 15.50 CAZADERO 5.6 W 14.50 CHALLENGE-BROWNSVILLE 1.3 WSW 13.93 ETTERSBURG 2.8 N 13.32 MIDDLE FK LYTLE CREEK 12.32 LAYTONVILLE 1 SW 11.94 BENBOW 3.8 SSE 11.91 GRASS VALLEY 5.5 SSE 11.91 PARADISE 1.2 W 11.91 ORTEGA HILL 11.86 GUERNEVILLE 2.0 SSW 11.47 DUTCH FLAT 0.7 S 11.29 MATILIJA CANYON 11.22 REDDING 7.9 NNE 10.15 MAD RIVER 7.4 SE 9.82 UKIAH 8.4 NW 9.72 MONROVIA 16 N 9.04 LAKE ARROWHEAD 8.57 SAN MARCOS PASS 8.49 DINSMORE 2.3 W 8.34 CRESCENT CITY 16.0 ESE 6.96 EUREKA 6.7 S 6.95 SANTA ROSA 2.9 ENE 6.70 BEAR VALLEY 1.1 S 6.52 SANTA CRUZ 8.8 NW 5.85 SANTA BARBARA AIRPORT 4.52 SAN FRANCISCO 3.4 S 4.31 SHAVER LAKE 3.69 UCLA 3.07 LOS ANGELES 2.6 NW 2.86 ...NEVADA... RENO 9.0 W 7.66 NEW WASHOE CITY 6.5 SW 7.39 INCLINE VILLAGE-CRYSTAL BAY 1.3 S 6.47 CARSON CITY 5.7 NW 5.64 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... PALISADES TAHOE AT ALPINE MEADOWS 113 MATTOLE ROAD 109 MAMMOTH MOUNTAIN 1.7 S 108 MESONET MTH03 PABLO POINT 108 MAGIC MOUNTAIN TRUCK 96 PINE MOUNTAIN FIRE ROAD 95 LONE TREE TOWERS 93 NORTH PEAK ACCESS ROAD 92 HIGH GLADE LOOKOUT 91 OLD COAST TOWER 91 WALKER 4 SSW 90 MINES TOWER 89 OAT MOUNTAIN 89 SCE WEST GRAPEVINE 89 MONO 84 NORTH RANCH 82 THOUSAND OAKS 4 ENE 82 SANTA CRUZ ISLAND 81 INYO 80 ROUND VALLEY 2 SSW 80 MILL CREEK 78 DE LA CONCEPCION 74 MAMMOTH LAKES 70 SHIP MOUNTAIN 70 TV TOWERS RD 2 70 BARLEY FLATS RD 67 CAT CANYON ROAD 64 DANGEMOND 61 PURISIMA HILLS 60 ...NEVADA... WASHOE 87 DOUGLAS 66 Additional waves of heavy rainfall are expected across portions of southern California today. The heaviest totals and greatest threat for additional scattered instances of flash flooding is expected north and east of downtown LA along the eastern Transverse Ranges, where a Slight Risk of Excessive Rainfall remains in effect. Showers will also continue along the foothills of the central Valleys, but lowering snow levels should limit additional flood impacts. Additional heavy snowfall is also expected for the interior northern mountains as well as the Sierra, with totals ranging between a few inches to locally as much as 1-2 feet for the higher mountain peaks. Precipitation is expected taper off into Friday night, leading to improving conditions this weekend. 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. Putnam $$
Summary #10
Dec 26, 02:28 AM UTC
Heavy rainfall and mountain snow continue to create dangerous conditions in California
Full text
ACUS45 KWBC 260228 SCCNS5 Storm Summary Number 10 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 PM PST Thu Dec 25 2025 ...Heavy rainfall and mountain snow continue to create dangerous conditions in California... Winter Storm Warnings are in effect for the Sierra Nevada and into the interior higher elevations of northern California. Wind Advisories are in effect for much of California and Nevada and portions of western Utah and Arizona. Flood Advisories are in effect for portions of the Central Valley and Southern California Coast. Flood Watches remain in effect for much of California. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 PM PST...National Weather Service Doppler Radar and surface observations showed a stream of moisture focusing over Central and Northern California, with widespread showers for these regions. Scattered precipitation was also being observed over portions of Southern California. Gusty winds continued across California, especially along the coast. ...Selected preliminary Storm Total Snowfall in inches from 400 PM PST Sat Dec 20 through 600 PM PST Thu Dec 25... ...CALIFORNIA... MONO CITY 1.9 SW 28.3 ASPENDELL 18.0 NORTHSTAR SKI BASE 12.0 TAHOMA 0.5 S 11.5 CARPENTER RIDGE 10.7 BEAR VALLEY 1.1 S 8.7 HEAVENLY SKI BASE 7.0 TRUCKEE 5.9 ENE 6.3 SOUTH LAKE TAHOE 1.4 ESE 5.8 ...NEVADA... MT. ROSE SKI BASE 14.0 DIAMON PEAK SNOW BASE 6.0 RENO 17.8 NNW 4.7 ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 PM PST Thu Dec 25... ...CALIFORNIA... HONEYDEW 3.2 SSE 17.20 WHITETHORN 1.7 NNW 15.63 POTTER VALLEY 8.4 ENE 15.50 CAZADERO 5.6 W 14.50 CHALLENGE-BROWNSVILLE 1.3 WSW 13.93 ETTERSBURG 2.8 N 13.32 MIDDLE FK LYTLE CREEK 12.32 LAYTONVILLE 1 SW 11.94 BENBOW 3.8 SSE 11.91 GRASS VALLEY 5.5 SSE 11.91 PARADISE 1.2 W 11.91 GUERNEVILLE 2.0 SSW 11.47 DUTCH FLAT 0.7 S 11.29 MATILIJA CANYON 10.34 REDDING 7.9 NNE 10.15 MAD RIVER 7.4 SE 9.82 UKIAH 8.4 NW 9.72 MONROVIA 16 N 9.04 LAKE ARROWHEAD 8.57 DINSMORE 2.3 W 8.34 CRESCENT CITY 16.0 ESE 6.96 EUREKA 6.7 S 6.95 SANTA ROSA 2.9 ENE 6.70 SANTA CRUZ 8.8 NW 5.85 SAN FRANCISCO 3.4 S 4.31 LOS ANGELES 2.6 NW 2.86 ...NEVADA... RENO 9.0 W 7.66 NEW WASHOE CITY 6.5 SW 7.39 INCLINE VILLAGE-CRYSTAL BAY 1.3 S 6.47 CARSON CITY 5.7 NW 5.64 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... MATTOLE ROAD 109 PABLO POINT 108 MAGIC MOUNTAIN TRUCK 96 PINE MOUNTAIN FIRE ROAD 95 LONE TREE TOWERS 93 HIGH GLADE LOOKOUT 91 OLD COAST TOWER 91 WALKER 4 SSW 90 MINES TOWER 89 OAT MOUNTAIN 89 SCE WEST GRAPEVINE 89 MONO 84 NORTH RANCH 82 SANTA CRUZ ISLAND 81 INYO 80 ROUND VALLEY 2 SSW 80 MILL CREEK 78 DE LA CONCEPCION 74 MAMMOTH LAKES 70 SHIP MOUNTAIN 70 TV TOWERS RD 2 70 BARLEY FLATS RD 67 CAT CANYON ROAD 64 DANGEMOND 61 PURISIMA HILLS 60 ...NEVADA... WASHOE 87 DOUGLAS 66 Heavy rainfall and gusty winds will continue across portions of California through Friday, leading to scattered to numerous instances of flash flooding over urban areas, high elevations into the foothills, and burn scars. Heavy snow will impact the higher elevations of the Sierra Nevada through Friday, creating dangerous travel conditions. Precipitation will taper off Friday night, leading to improving conditions this weekend. 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. Dolan $$
Summary #9
Dec 25, 03:13 PM UTC
Periodic heavy rainfall continues to stream into California, bringing dangerous flash flooding, high winds, and high elevation winter storm conditions through Friday
Full text
ACUS45 KWBC 251513 SCCNS5 Storm Summary Number 9 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Thu Dec 25 2025 ...Periodic heavy rainfall continues to stream into California, bringing dangerous flash flooding, high winds, and high elevation winter storm conditions through Friday... Flash Flood Warnings are ongoing across Southern California. Flood Watches remain in effect for much of California. Winter Storm Warnings are in effect for the Sierra Nevada and into the interior higher elevations of northern California. High Wind Warnings and Advisories are in effect for the West Coast including much of California and Nevada, portions of Oregon, and northwestern Arizona. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...Radar and surface observations show a focused area of showers, thunderstorms, and gusty winds streaming into north-central California ahead of an offshore occluded 982 mb low pressure center. ...Selected preliminary Storm Total Snowfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Thu Dec 25... ...CALIFORNIA... CARPENTER RIDGE 10.7 BEAR VALLEY 1.1 S 8.7 HEAVENLY SKI BASE 7.0 NORTHSTAR SKI BASE 7.0 PALISADES TAHOE SKI BASE 4.0 ...NEVADA... MT. ROSE SKI BASE 14.0 DIAMON PEAK SNOW BASE 6.0 ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Thu Dec 25... ...CALIFORNIA... HONEYDEW 3.2 SSE 15.83 WHITETHORN 2.4 WSW 15.06 POTTER VALLEY 8.4 ENE 13.50 CAZADERO 5.6 W 13.49 MIDDLE FK LYTLE CREEK 12.32 STORRIE 7.2 S 11.16 LAYTONVILLE 1 SW 11.09 GRASS VALLEY 5.5 SSE 10.92 HILLCREST 1.3 E 10.68 BLUE CANYON 10.61 WHITETHORN 1.7 NNW 10.45 MATILIJA CANYON 10.34 REDDING 7.9 NNE 10.15 JARBO GAP 9.88 DUTCH FLAT 0.7 S 9.77 COGSWELL DAM 9.65 CHILAO SOUTH 9.45 OLD MAN MOUNTAIN 9.45 MONROVIA 16 N 9.04 MEADOW VALLEY 5.6 WSW 8.93 MAD RIVER 7 SE 8.86 CASTELLA 1.8 E 8.64 LAKE ARROWHEAD 8.57 WRIGHTWOOD FS 8.46 UKIAH 8 NW 8.18 ORTEGA HILL 7.71 ETTERSBURG 2.8 N 7.52 MORMON ROCK 7.25 DINSMORE 2.3 W 7.18 REDDING 2.1 NNW 5.93 BLUE LAKE 2 WNW 5.03 EUREKA 0.8 SSE 4.86 DINKEY CREEK 4.65 YOSEMITE NP 4.54 CRESCENT CITY 16.0 ESE 4.26 SANTA ROSA 2.5 SE 4.08 RICHARDSON GROVE 5 E 4.00 TEHACHAPI 3.63 SANTA CRUZ 8.9 NW 2.66 LA DOWNTOWN 2.61 LAX 1.93 SAN FRANCISCO 1.6 SE 1.92 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... MATTOLE ROAD 109 PABLO POINT 108 MAGIC MOUNTAIN TRUCK 96 PINE MOUNTAIN FIRE ROAD 95 LONE TREE TOWERS 93 HIGH GLADE LOOKOUT 91 OLD COAST TOWER 91 WALKER 4 SSW 90 MINES TOWER 89 OAT MOUNTAIN 89 MONO 84 NORTH RANCH 82 SANTA CRUZ ISLAND 81 INYO 80 ROUND VALLEY 2 SSW 80 MILL CREEK 78 DE LA CONCEPCION 74 MAMMOTH LAKES 70 TV TOWERS RD 2 70 BARLEY FLATS RD 67 CAT CANYON ROAD 64 DANGEMOND 61 PURISIMA HILLS 60 KENTUCKY SPRINGS 58 GRAPEVINE 4 SSW 57 EMIGRANT GAP 51 REDDING 51 RED BLUFF 48 ...NEVADA... WASHOE 87 DOUGLAS 66 Heavy rainfall and gusty winds will continue across parts of Southern California through Christmas Day, maintaining the threat of flash flooding, power outages, landslides, and mudslides through tomorrow. Meanwhile, very heavy snow measured in feet will impact the higher elevations of the Sierra Nevada over the next couple of days. 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 #8
Dec 25, 02:47 AM UTC
Periodic heavy rainfall continues to stream into California, bringing dangerous flash flooding hazards, high winds, and high elevation winter storm conditions through Friday
Full text
ACUS45 KWBC 250247 SCCNS5 Storm Summary Number 8 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 PM PST Wed Dec 24 2025 ...Periodic heavy rainfall continues to stream into California, bringing dangerous flash flooding hazards, high winds, and high elevation winter storm conditions through Friday... Flash Flood Warnings are ongoing across Southern California. Flood Watches remain in effect for much of California into southern Nevada and northwestern Arizona. Winter Storm Warnings are in effect for the Sierra Nevada and into the interior higher elevations of northern California. High Wind Warnings and Advisories are in effect for the West Coast including much of California and Nevada, portions of Oregon, and northwestern Arizona. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 700 PM PST...National radar and surface observations show a 1000 mb (29.53 in Hg) surface low has moved into southern Washington, pushing the cold front into parts of Washington, Oregon, and Eastern California into parts of Nevada. Rounds of heavy rainfall has streamed into southern California and parts of the California coast, due to surges of moisture from the atmospheric river that has come ashore. Widespread rain and gusty winds has moved across eastern California into parts of Nevada and Oregon, ahead of the cold front. ...Selected preliminary Storm Total Snowfall in inches from 400 PM PST Sat Dec 20 through 700 PM PST Wed Dec 24... ...CALIFORNIA... CARPENTER RIDGE 10.7 BEAR VALLEY 1.1 S 8.7 HEAVENLY SKI BASE 7.0 NORTHSTAR SKI BASE 7.0 PALISADES TAHOE SKI BASE 4.0 ...NEVADA... MT. ROSE SKI BASE 14.0 DIAMON PEAK SNOW BASE 6.0 ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 700 PM PST Wed Dec 24... ...CALIFORNIA... HONEYDEW 3.2 SSE 11.46 STORRIE 7.2 S 11.16 HILLCREST 1.3 E 10.68 BLUE CANYON 10.61 MIDDLE FK LYTLE CREEK 10.57 WHITETHORN 1.7 NNW 10.45 CAZADERO 1.3 SSE 10.05 JARBO GAP 9.88 COGSWELL DAM 9.65 CHILAO SOUTH 9.45 OLD MAN MOUNTAIN 9.45 MEADOW VALLEY 5.6 WSW 8.93 WHITETHORN 1.4 NW 8.71 POTTER VALLEY 8.4 ENE 8.65 CASTELLA 1.8 E 8.64 WRIGHTWOOD FS 8.46 DUTCH FLAT 0.7 S 8.01 LAYTONVILLE 1 SW 7.72 ORTEGA HILL 7.71 ETTERSBURG 2.8 N 7.52 MORMON ROCK 7.25 GRASS VALLEY 5.5 SSE 7.23 MAD RIVER 7 SE 6.62 REDDING 2.1 NNW 5.93 BENBOW 3.8 SSE 5.90 EMIGRANT GAP 5.85 GARBERVILLE 0.8 NW 5.63 UKIAH 8 NW 5.20 DOS RIOS 3 SSE 5.15 BLUE LAKE 2 WNW 5.03 DINKEY CREEK 4.65 YOSEMITE NP 4.54 CRESCENT CITY 16.0 ESE 4.26 SANTA ROSA 2.5 SE 4.08 RICHARDSON GROVE 5 E 4.00 DINSMORE 2.3 W 3.88 TEHACHAPI 3.63 EUREKA 2.2 S 3.56 TRINITY CENTER 3.27 SANTA CRUZ 8.9 NW 2.66 SAN RAFAEL 1.4 NW 2.65 SAN FRANCISCO 1.6 SE 1.92 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... MATTOLE ROAD 109 PABLO POINT 108 MAGIC MOUNTAIN TRUCK 96 PINE MOUNTAIN FIRE ROAD 95 LONE TREE TOWERS 93 HIGH GLADE LOOKOUT 91 OLD COAST TOWER 91 WALKER 4 SSW 90 MINES TOWER 89 OAT MOUNTAIN 89 MONO 84 NORTH RANCH 82 SANTA CRUZ ISLAND 81 INYO 80 ROUND VALLEY 2 SSW 80 MILL CREEK 78 DE LA CONCEPCION 74 MAMMOTH LAKES 70 TV TOWERS RD 2 70 BARLEY FLATS RD 67 CAT CANYON ROAD 64 DANGEMOND 61 PURISIMA HILLS 60 KENTUCKY SPRINGS 58 GRAPEVINE 4 SSW 57 EMIGRANT GAP 51 REDDING 51 RED BLUFF 48 ...NEVADA... WASHOE 87 DOUGLAS 66 Periodic rainfall and gusty winds are expected to continue across parts of California into Christmas Day, especially over Southern California where multiple rounds of heavy rainfall are expected through Friday. Flash flooding is ongoing and is likely to persist as rainfall continues. Vulnerable areas include urban areas, high elevations into the foothills, and burn scars. The line of heavy rainfall continues to move east of central California into Nevada and parts of Western Idaho. Meanwhile, very heavy snow measured in feet will impact the higher elevations of the Sierra Nevada over the next few days. Another round of heavy rainfall and gusty winds will be reinforced on Friday as another low pressure and surface front approach the region. The threat of flash flooding, gusty winds, a possible tornado or water spout, power outages, landslides, and mudslides will persist into Friday as the very active pattern continues. 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. Oudit $$
Summary #7
Dec 24, 02:44 PM UTC
Heavy rainfall is streaming into California, bringing dangerous flash flooding hazards, high winds, and high elevation winter storm conditions
Full text
ACUS45 KWBC 241444 SCCNS5 Storm Summary Number 7 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Wed Dec 24 2025 ... Heavy rainfall is streaming into California, bringing dangerous flash flooding hazards, high winds, and high elevation winter storm conditions ... Flash flood warnings are ongoing across Southern California. Flood Watches remain in effect for much of California into southern Nevada and northwestern Arizona. Winter Storm Warnings are in effect for the Sierra Nevada and into the interior higher elevations of northern California. High Wind Warnings and Advisories are in effect for the West Coast including much of California and Nevada, portions of Oregon, western Washington, and northwestern Arizona. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...National radar and surface observations show a 989 mb (29.21 in Hg) surface low in extreme southern Oregon with an attendant cold front moving through central and northern California. Rounds of heavy rainfall are streaming into southern California as the surge of moisture with the atmospheric river has come ashore. A line of heavy rain containing gusty winds is moving across central California in the Sacramento Valley ahead of the cold front. ...Selected preliminary Storm Total Snowfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Tue Dec 23... ...CALIFORNIA... CARPENTER RIDGE 10.7 BEAR VALLEY 1.1 S 8.7 HEAVENLY SKI BASE 7.0 NORTHSTAR SKI BASE 7.0 PALISADES TAHOE SKI BASE 4.0 ...NEVADA... MT. ROSE SKI BASE 14.0 DIAMON PEAK SNOW BASE 6.0 ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Tue Dec 23... ...CALIFORNIA... HONEYDEW 3.2 SSE 11.46 STORRIE 7.2 S 11.16 HILLCREST 1.3 E 10.68 BLUE CANYON 10.61 WHITETHORN 1.7 NNW 10.45 CAZADERO 1.3 SSE 10.05 JARBO GAP 9.88 MEADOW VALLEY 5.6 WSW 8.93 WHITETHORN 1.4 NW 8.71 POTTER VALLEY 8.4 ENE 8.65 CASTELLA 1.8 E 8.64 DUTCH FLAT 0.7 S 8.01 LAYTONVILLE 1 SW 7.72 ETTERSBURG 2.8 N 7.52 GRASS VALLEY 5.5 SSE 7.23 MAD RIVER 7 SE 6.62 REDDING 2.1 NNW 5.93 BENBOW 3.8 SSE 5.90 EMIGRANT GAP 5.85 GARBERVILLE 0.8 NW 5.63 UKIAH 8 NW 5.20 DOS RIOS 3 SSE 5.15 BLUE LAKE 2 WNW 5.03 CRESCENT CITY 16.0 ESE 4.26 SANTA ROSA 2.5 SE 4.08 RICHARDSON GROVE 5 E 4.00 DINSMORE 2.3 W 3.88 EUREKA 2.2 S 3.56 TRINITY CENTER 3.27 SANTA CRUZ 8.9 NW 2.66 SAN RAFAEL 1.4 NW 2.65 SAN FRANCISCO 1.6 SE 1.92 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... WALKER 4 SSW 90 MONO 84 INYO 80 ROUND VALLEY 2 SSW 80 MAGIC MOUNTAIN TRUCK 79 MILL CREEK 78 DE LA CONCEPCION 74 MAMMOTH LAKES 70 TV TOWERS RD 2 70 BARLEY FLATS RD 67 CAT CANYON ROAD 64 DANGEMOND 61 SANTA CRUZ ISLAND 61 PURISIMA HILLS 60 KENTUCKY SPRINGS 58 GRAPEVINE 4 SSW 57 EMIGRANT GAP 51 REDDING 51 RED BLUFF 48 ...NEVADA... WASHOE 87 DOUGLAS 66 Southern California can expect bands and multiple rounds of heavy rainfall through late afternoon into early evening. Flash flooding is ongoing and is likely to persist this afternoon. Vulnerable areas include urban areas, high elevations into the foothills, and burn scars. The initial line of heavy rainfall has moved east of coastal northern California, including the Bay Area, but blustery and showery conditions are likely to continue. Meanwhile, very heavy snow measured in feet will impact the higher elevations of the Sierra Nevada over the next few days. A couple more rounds of heavy rainfall and gusty winds will be possible for California on Christmas day and then again on Friday as another low pressure and surface front approach the region. The threat of flash flooding, gusty winds, a possible tornado or water spout, power outages, landslides, and mudslides will persist into Friday as the very active pattern continues. 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. Wilder $$
Summary #5
Dec 24, 02:26 AM UTC
Strong atmospheric river to bring heavy rain and snow to much of California through the week; high risk of flash flooding across parts of southern California on Wednesday
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ACUS45 KWBC 240226 SCCNS5 Storm Summary Number 5 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 PM PST Tue Dec 23 2025 ...Strong atmospheric river to bring heavy rain and snow to much of California through the week; high risk of flash flooding across parts of southern California on Wednesday... Flood Watches remain in effect for much of California into southern Nevada and northwestern Arizona. Winter Storm Warnings are in effect for the Sierra Nevada and into the interior higher elevations of northern California. High Wind Warnings and Advisories are in effect for the West Coast including much of California and Nevada, portions of Oregon, western Washington, and northwestern Arizona. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 PM PST...A low pressure system associated with a strong atmospheric river was located about 500 miles west of southern California, with an estimated central pressure of 993 mb (29.32 in Hg). A warm front and stationary front extended northeastward from this low and was draped across northern California and into the northern Rockies. National Weather Service Doppler Radar and surface observations showed scattered showers across much of California, with more widespread precipitation located just offshore the northern California coastline. ...Selected preliminary Storm Total Snowfall in inches from 400 PM PST Sat Dec 20 through 600 PM PST Tue Dec 23... ...CALIFORNIA... CARPENTER RIDGE 10.7 BEAR VALLEY 1.1 S 8.7 HEAVENLY SKI BASE 7.0 NORTHSTAR SKI BASE 7.0 PALISADES TAHOE SKI BASE 4.0 ...NEVADA... MT. ROSE SKI BASE 11.0 ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 PM PST Tue Dec 23... ...CALIFORNIA... HONEYDEW 3.2 SSE 11.46 STORRIE 7.2 S 11.16 HILLCREST 1.3 E 10.68 BLUE CANYON 10.61 WHITETHORN 1.7 NNW 10.45 CAZADERO 1.3 SSE 10.05 JARBO GAP 9.88 MEADOW VALLEY 5.6 WSW 8.93 WHITETHORN 1.4 NW 8.71 POTTER VALLEY 8.4 ENE 8.65 CASTELLA 1.8 E 8.64 DUTCH FLAT 0.7 S 8.01 LAYTONVILLE 1 SW 7.72 ETTERSBURG 2.8 N 7.52 GRASS VALLEY 5.5 SSE 7.23 MAD RIVER 7 SE 6.62 REDDING 2.1 NNW 5.93 BENBOW 3.8 SSE 5.90 EMIGRANT GAP 5.85 GARBERVILLE 0.8 NW 5.63 UKIAH 8 NW 5.20 DOS RIOS 3 SSE 5.15 BLUE LAKE 2 WNW 5.03 CRESCENT CITY 16.0 ESE 4.26 RICHARDSON GROVE 5 E 4.00 DINSMORE 2.3 W 3.88 SANTA ROSA 2.5 SE 3.84 EUREKA 2.2 S 3.56 TRINITY CENTER 3.27 SANTA CRUZ 8.9 NW 2.66 SAN RAFAEL 1.4 NW 2.65 SAN FRANCISCO 1.6 SE 1.92 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... WALKER 4 SSW 90 MONO 84 INYO 80 ROUND VALLEY 2 SSW 80 DE LA CONCEPCION 74 MAMMOTH LAKES 70 CAT CANYON ROAD 64 DANGEMOND 61 PURISIMA HILLS 60 KENTUCKY SPRINGS 58 GRAPEVINE 4 SSW 57 EMIGRANT GAP 51 REDDING 51 RED BLUFF 48 ...NEVADA... WASHOE 87 DOUGLAS 66 After a lull in the precipitation from yesterday into today, a renewed surge of moisture associated with an intensifying low pressure system and strong atmospheric river will begin to push into California later tonight into Wednesday. This moisture will support the production of very heavy precipitation, including heavy rain in the lower elevations and heavy snow in the high country. The high rainfall rates will lead to a high risk of flash flooding along the southern slopes of the Transverse Range of southern California on Wednesday. Urban flooding in the metro areas of southern California will also be possible. Additionally, the persistent nature of the moderate to heavy rain is expected to heighten the threat of flash flooding, landslides, rockfalls, and mudslides for the remainder of this week farther north into northern California. Meanwhile, very heavy snow measured in feet will impact the higher elevations of the Sierra Nevada beginning on Wednesday. The prolonged heavy snow will likely lead to difficult if not impossible travel across many of the higher mountain passes within the Sierra. Strong and very gusty winds will also likely contribute to tree damage and possible power outages. 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. Miller $$
Summary #4
Dec 23, 03:44 PM UTC · corrects an earlier issuance
Strong atmospheric river to bring a high risk of flash flooding to southern California on Wednesday, and periods of heavy precipitation to much of California into the Christmas holiday
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ACUS45 KWBC 231544 SCCNS5 Storm Summary Number 4 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Tue Dec 23 2025 ...Strong atmospheric river to bring a high risk of flash flooding to southern California on Wednesday, and periods of heavy precipitation to much of California into the Christmas holiday... Flood Watches remain in effect for much of California into southern Nevada and northwestern Arizona. Winter Storm Warnings are in effect for the Sierra Nevada and into the interior higher elevations of northern California. High Wind Warnings and Advisories are in effect for the West Coast including much of California and Nevada, portions of Oregon, western Washington, and northwestern Arizona. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...A stationary front associated with a strong atmospheric river event remained draping across northern California and through the northwestern U.S. Meanwhile, a low pressure system located about 500 miles west of southern California, with an estimated central pressure of 1000 mb (29.53 inches of Hg), was moving northeastward along the stationary front toward northern California. National Weather Service Doppler Radar and surface observations showed a swath of light to moderate precipitation covering northwestern California into southwestern Oregon. ...Selected preliminary Storm Total Snowfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Tue Dec 23... ...CALIFORNIA... HEAVENLY SKI BASE 7.0 NORTHSTAR SKI BASE 7.0 ...NEVADA... MT. ROSE SKI BASE 11.0 ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Tue Dec 23... ...CALIFORNIA... STORRIE 7.2 S 11.16 HONEYDEW 3.2 SSE 11.08 HILLCREST 1.3 E 10.68 BLUE CANYON 10.61 JARBO GAP 9.88 WHITETHORN 1.7 NNW 9.87 CAZADERO 1.3 SSE 9.60 MEADOW VALLEY 5.6 WSW 8.93 WHITETHORN 1.4 NW 8.71 POTTER VALLEY 8.4 ENE 8.65 CASTELLA 1.8 E 8.64 DUTCH FLAT 0.7 S 8.01 LAYTONVILLE 1 SW 7.72 ETTERSBURG 2.8 N 7.52 GRASS VALLEY 1.3 NNE 7.00 MAD RIVER 7 SE 6.62 BENBOW 3.8 SSE 5.90 EMIGRANT GAP 5.85 GARBERVILLE 0.8 NW 5.63 UKIAH 8 NW 5.20 DOS RIOS 3 SSE 5.15 BLUE LAKE 2 WNW 5.03 REDDING 7.9 NNE 4.95 CRESCENT CITY 16.0 ESE 4.15 RICHARDSON GROVE 5 E 4.00 DINSMORE 2.3 W 3.88 EUREKA 2.2 S 3.56 SANTA ROSA 2.1 NNE 3.42 TRINITY CENTER 3.27 SAN RAFAEL 1.4 NW 2.65 SAN FRANCISCO 3.1 W 1.54 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... WALKER 4 SSW 90 MONO 84 INYO 80 ROUND VALLEY 2 SSW 80 MAMMOTH LAKES 70 EMIGRANT GAP 51 REDDING 51 RED BLUFF 48 ...NEVADA... WASHOE 87 DOUGLAS 66 After a lull in the precipitation from yesterday into this morning, heavy rain associated with an intensifying low pressure system off the coast of California will gradually edge toward northern California, reaching the coastal region of northern California by this evening and into coastal central California later tonight. By Wednesday, very heavy rainfall is forecast to surge into southern California as moderate to heavy rain spreads farther north into the lower elevations of California. The high rainfall rates will lead to a high risk of flash flooding along the southern slopes of the Transverse Range of southern California on Wednesday. Urban flooding in the metro areas of southern California will also be possible. In addition, the persistent nature of the moderate to heavy rain is expected to heighten the threat of flash flooding, landslides, rockfalls, and mudslides for the remainder of this week farther north into northern California. Meanwhile, very heavy snow measured in feet will impact the higher elevations of the Sierra Nevada beginning on Wednesday. The prolonged heavy snow will likely lead to difficult if not impossible travel across many of the higher mountain passes within the Sierra. Strong and very gusty winds will also likely contribute to tree damage and possible power outages. 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. Kong $$
Superseded version, Dec 23, 03:31 PM UTC
ACUS45 KWBC 231531 SCCNS5 Storm Summary Number 4 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Tue Dec 23 2025 ...Strong atmospheric river to bring a high risk of flash flooding to southern California on Wednesday, and periods of heavy precipitation to much of California into the Christmas holiday... Flood Watches remain in effect for much of California into southern Nevada and northwestern Arizona. Winter Storm Warnings are in effect for the Sierra Nevada and into the interior higher elevations of northern California. High Wind Warnings and Advisories are in effect for the West Coast including much of California and Nevada, portions of Oregon, western Washington, and northwestern Arizona. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...A stationary front associated with a strong atmospheric river event remained draping across northern California and through the northwestern U.S. Meanwhile, a low pressure system located about 500 miles west of southern California, with an estimated central pressure of 1000 mb (29.53 inches of Hg), was moving northeastward along the stationary front toward northern California. National Weather Service Doppler Radar and surface observations showed a swath of light to moderate precipitation covering northwestern California into southwestern Oregon. ...Selected preliminary Storm Total Snowfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Mon Dec 22... ...CALIFORNIA... HEAVENLY SKI BASE 7.0 NORTHSTAR SKI BASE 7.0 ...NEVADA... MT. ROSE SKI BASE 11.0 ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Mon Dec 22... ...CALIFORNIA... STORRIE 7.2 S 11.16 HONEYDEW 3.2 SSE 11.08 HILLCREST 1.3 E 10.68 BLUE CANYON 10.61 JARBO GAP 9.88 WHITETHORN 1.7 NNW 9.87 CAZADERO 1.3 SSE 9.60 MEADOW VALLEY 5.6 WSW 8.93 WHITETHORN 1.4 NW 8.71 POTTER VALLEY 8.4 ENE 8.65 CASTELLA 1.8 E 8.64 DUTCH FLAT 0.7 S 8.01 LAYTONVILLE 1 SW 7.72 ETTERSBURG 2.8 N 7.52 GRASS VALLEY 1.3 NNE 7.00 MAD RIVER 7 SE 6.62 BENBOW 3.8 SSE 5.90 EMIGRANT GAP 5.85 GARBERVILLE 0.8 NW 5.63 UKIAH 8 NW 5.20 DOS RIOS 3 SSE 5.15 BLUE LAKE 2 WNW 5.03 REDDING 7.9 NNE 4.95 CRESCENT CITY 16.0 ESE 4.15 RICHARDSON GROVE 5 E 4.00 DINSMORE 2.3 W 3.88 EUREKA 2.2 S 3.56 SANTA ROSA 2.1 NNE 3.42 TRINITY CENTER 3.27 SAN RAFAEL 1.4 NW 2.65 SAN FRANCISCO 3.1 W 1.54 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... WALKER 4 SSW 90 MONO 84 INYO 80 ROUND VALLEY 2 SSW 80 MAMMOTH LAKES 70 EMIGRANT GAP 51 REDDING 51 RED BLUFF 48 ...NEVADA... WASHOE 87 DOUGLAS 66 After a lull in the precipitation from yesterday into this morning, heavy rain associated with an intensifying low pressure system off the coast of California will gradually edge toward northern California, reaching the coastal region of northern California by this evening and into coastal central California later tonight. By Wednesday, very heavy rainfall is forecast to surge into southern California as moderate to heavy rain spreads farther north into the lower elevations of California. The high rainfall rates will lead to a high risk of flash flooding along the southern slopes of the Transverse Range of southern California on Wednesday. Urban flooding in the metro areas of southern California will also be possible. In addition, the persistent nature of the moderate to heavy rain is expected to heighten the threat of flash flooding, landslides, rockfalls, and mudslides for the remainder of this week farther north into northern California. Meanwhile, very heavy snow measured in feet will impact the higher elevations of the Sierra Nevada beginning on Wednesday. The prolonged heavy snow will likely lead to difficult if not impossible travel across many of the higher mountain passes within the Sierra. Strong and very gusty winds will also likely contribute to tree damage and possible power outages. 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. Kong $$
Summary #3
Dec 23, 02:04 AM UTC
Strong atmospheric river to bring periods of heavy precipitation to California through the week
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ACUS45 KWBC 230204 SCCNS5 Storm Summary Number 3 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 PM PST Mon Dec 22 2025 ...Strong atmospheric river to bring periods of heavy precipitation to California through the week... Flood Warnings, Watches, and Advisories are in effect for much of California into southern Nevada and northwestern Arizona Winter Storm Watches and Warnings are in effect for much of the Sierra Nevada. High Wind Watches and Warnings are in effect for parts of California and into Oregon. Wind Advisories are in effect for portions of northern California, southwestern Oregon, and central Nevada. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 PM PST...A pair of frontal systems and a strong atmospheric river was continuing to direct a stream of enhanced moisture across northern California. National Weather Service Doppler Radar and surface observations showed a narrow swath of light to moderate precipitation falling across portions of northern California. ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 PM PST Mon Dec 22... ...CALIFORNIA... STORRIE 7.2 S 11.16 HILLCREST 1.3 E 10.68 BLUE CANYON 10.61 JARBO GAP 9.88 CAZADERO 1.3 SSE 9.60 MEADOW VALLEY 5.6 WSW 8.93 WHITETHORN 1.4 NW 8.71 CASTELLA 1.8 E 8.64 DUTCH FLAT 0.7 S 8.01 HONEYDEW 3.2 SSE 7.81 LAYTONVILLE 1 SW 7.72 GRASS VALLEY 1.3 NNE 7.00 MAD RIVER 7 SE 6.62 ETTERSBURG 2.8 N 5.92 BENBOW 3.8 SSE 5.90 EMIGRANT GAP 5.85 GARBERVILLE 0.8 NW 5.63 UKIAH 8 NW 5.20 DOS RIOS 3 SSE 5.15 BLUE LAKE 2 WNW 5.03 REDDING 7.9 NNE 4.95 CRESCENT CITY 16.0 ESE 4.15 RICHARDSON GROVE 5 E 4.00 DINSMORE 2.3 W 3.88 EUREKA 2.2 S 3.56 SANTA ROSA 2.1 NNE 3.42 TRINITY CENTER 3.27 SAN RAFAEL 1.4 NW 2.65 SAN FRANCISCO 3.1 W 1.54 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... WALKER 4 SSW 90 MONO 84 INYO 80 ROUND VALLEY 2 SSW 80 MAMMOTH LAKES 70 EMIGRANT GAP 51 REDDING 51 RED BLUFF 48 ...NEVADA... WASHOE 87 DOUGLAS 66 After a lull with lighter precipitation tonight, heavy precipitation will gradually ramp back up across much of northern and central California on Tuesday as the next low pressure system intensifies and pushes onshore. By Wednesday, more widespread periods of moderate to heavy rain will surge into southern California as very heavy snow blankets the higher elevations of the Sierra Nevada. Persistent moderate to heavy rains are expected to worsen the threat of flash flooding, landslides, rockfalls, and mudslides for the remainder of this week in the affected areas. Additionally, the prolonged heavy snow will likely lead to difficult if not impossible travel across many of the higher mountain passes within the Sierra. Strong and very gusty winds will also likely contribute to tree damage and possible power outages. 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. Miller $$
Summary #2
Dec 22, 03:03 PM UTC
Strong atmospheric river to bring periods of heavy precipitation to California this week
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ACUS45 KWBC 221503 SCCNS5 Storm Summary Number 2 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Mon Dec 22 2025 ...Strong atmospheric river to bring periods of heavy precipitation to California this week... Flood Warnings, Watches, and Advisories are in effect for much of California into southern Nevada and northwestern Arizona Winter Storm Watches and Warnings are in effect for the Sierra Nevada, with Winter Weather advisories and Winter Storm Warnings for the central portion of the Sierra Nevada. High Wind Watches are in effect for parts of California and into Oregon. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...A stationary front associated with the current atmospheric river event remained draping across northern California and further inland through the northwestern U.S. As the initial low pressure wave and the main energy associated with the jet stream had moved further inland early this morning, the coverage and intensity of the precipitation had decreased and drifted farther south toward central California, including the snow across the higher terrain of the Sierra Nevada. ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 600 AM PST Mon Dec 22... ...CALIFORNIA... WHITETHORN 1.4 NW 8.71 HONEYDEW 3.2 SSE 7.81 ETTERSBURG 2.8 N 5.92 BENBOW 3.8 SSE 5.90 EMIGRANT GAP 5.85 LAYTONVILLE 13.1 N 5.05 REDDING 7.9 NNE 4.95 MAD RIVER 7.4 SE 4.25 RICHARDSON GROVE 5 E 4.00 DINSMORE 2.3 W 3.88 TRINITY CENTER 3.27 EUREKA 3.12 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... WALKER 4 SSW 90 MONO 84 INYO 80 ROUND VALLEY 2 SSW 80 MAMMOTH LAKES 70 EMIGRANT GAP 51 REDDING 51 RED BLUFF 48 ...NEVADA... WASHOE 87 DOUGLAS 66 Heavy precipitation is forecast to resume tonight across northern and central California as the next low pressure system intensifies and pushes onshore. By Wednesday, heavy rain is forecast to surge into southern California as very heavy snow reaches the Sierra Nevada. Periods of moderate to heavy rain are expected to heighten the threat of flash flooding, landslides, rockfalls, and mudslides for the remainder of this week in the affected areas. In the higher elevations of the Sierra, the prolonged heavy snow will likely lead to difficult if not impossible travel across many of the passes. Strong and very gusty winds will also likely contribute to tree damage and possible power outages. 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. Kong $$
Summary #1
Dec 22, 02:54 AM UTC
Strong atmospheric river to bring heavy precipitation to California this week
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ACUS45 KWBC 220254 SCCNS5 Storm Summary Number 1 for California Atmospheric River NWS Weather Prediction Center College Park MD 700 PM PST Sun Dec 21 2025 ...Strong atmospheric river to bring heavy precipitation to California this week... Flood Warnings, Watches, and Advisories are in effect for much of California. Winter Storm Warnings and Watches are in effect for the Sierra Nevada. Winter Weather Advisories are in effect for parts of the Sierra Nevada and Cascades. High Wind Warnings and Watches are in effect for parts of California, Nevada, and Oregon. Wind Advisories are in effect for parts of California and Nevada. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 700 PM PST...A strong atmospheric river was directing copious amounts of moisture into northern California. National Weather Service Doppler Radar showed moderate to heavy rain falling across much of northern California, with snow falling in the higher terrain of the Sierra Nevada and Cascades. ...Selected preliminary Storm Total Rainfall in inches from 400 PM PST Sat Dec 20 through 700 PM PST Sun Dec 21... ...CALIFORNIA... WHITETHORN 1.4 NW 8.71 HONEYDEW 3.2 SSE 7.81 EMIGRANT GAP 5.85 LAYTONVILLE 13.1 N 5.05 MAD RIVER 7.4 SE 4.25 RICHARDSON GROVE 5 E 4.00 DINSMORE 2.3 W 3.88 TRINITY CENTER 3.27 EUREKA 1 E 2.80 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... ROUND VALLEY 2 SSW 80 MAMMOTH LAKES 70 EMIGRANT GAP 51 REDDING 51 RED BLUFF 48 Heavy precipitation is expected to continue across California as the atmospheric river meanders over the state this week. Periods of moderate to heavy rain may lead to flash flooding, landslides, rockfalls, and mudslides. In the higher elevations of the Sierra, a prolonged heavy snow event will likely lead to difficult if not impossible travel across many of the passes. Strong winds will also likely contribute to tree damage and possible power outages. 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. Miller $$
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.