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ACUS44 KWBC 091501

SCCNS4



Storm Summary Number 1 for Significant California Atmospheric River

NWS Weather Prediction Center College Park MD

700 AM PST Mon Jan 09 2023



...Significant heavy rainfall, mountain snow, and strong winds

will continue to impact CA and western NV into Tuesday...



High Wind Warnings extend along much of coastal California, and

over portions of the Sacramento Valley.



Winter Storm Warnings are in effect over the Sierra Nevadas and

Shastas.



Flood Watches extend along much of coastal California, into the

Sacramento Valley.



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 detected

widespread moderate to heavy rainfall over much of California,

associated with an intense atmospheric river plume surging inland

ahead of an offshore cold front. Sustained winds reaching 25-30

mph were also noted within the Sacramento Valley beneath a strong

low-level jet.



...Selected preliminary Storm Total Rainfall in inches from 500 PM

PST Sun Jan 08 through 600 AM PST Mon Jan 09...



...CALIFORNIA...

MINING RIDGE                         7.41                    

THREE PEAKS                          5.59                    

BOULDER CREEK 4.1 N                  4.06                    

NORDHOFF RIDGE                       3.03                    

BARNABY                              2.93                    

EL CERRITO .3 WNW                    2.04                    

SANTA ROSA 1.3 NW                    1.75                    

SAN FRANCISCO INTL AIRPORT           1.29                    

SACRAMENTO 8.0 NE                    1.08                    



...Selected preliminary Peak Wind gusts in miles per hour earlier

in the event...



...CALIFORNIA...

WASHOE CITY 2 NNE                      98                    

WEITCHPEC 11 WSW                       86                    

KNEELAND 6 SSE                         77                    

CRESCENT CITY 3 NW                     68                    





The barrage of heavy rainfall, mountain snow, and strong winds

will persist Monday into Tuesday over California and western

Nevada. The cumulative effect of successive heavy rain events will

lead to additional considerable flood impacts, including rapid

water rises and mudslides, over northern and central California,

and portions of far western Nevada. Numerous instances of flash

flooding and debris flows are possible over burn scar areas, and

scattered power outages are also likely due to the strong wind

gusts. Atop the Sierra Nevadas and Shastas, 1-4 feet of additional

snowfall through Tuesday will lead to dangerous travel above 4000

feet. Mountain communities will be at increasing risk of

infrastructure impacts and avalanches as snow load continues to

increase.



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

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