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