313
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
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