Storm Summary Number 5 for West Coast Multi-Hazard Atmospheric
River Events
NWS Weather Prediction Center College Park MD
700 AM PST Sat Jan 07 2023

...Heavy rain/snow and high winds continue the next Atmospheric
River over northern and central CA...

Winter Storm Warnings are in effect for portions of the Sierra
Nevada and Klamath Mountain Ranges.

Flood Watches are in effect for much of coastal California, and
the southern Sacramento Valley through San Joaquin Valley.

Wind Advisories are in effect over Coastal California, and over
the Sacramento Valley through the San Joaquin Valley.

For a detailed graphical depiction of the latest watches, warnings
and advisories, please see www.weather.gov

At 600 AM PST...Latest surface observations and RADAR detected a
stream of moderate to heavy stratiform rainfall focusing over
northern and central California associated with the atmospheric
river that arrived Friday evening. Further north, scattered light
to moderate rainfall was noted over Oregon and Washington. This
activity was occuring ahead of a weak Pacific cold front analyzed
just offshore the California coast.

...Selected preliminary Storm Total Snowfall in inches from 700 AM
PST Wed Jan 04 through 600 AM PST Sat Jan 07...

...CALIFORNIA...
KIRKWOOD MEADOWS 1 SSE               33.0                    
PINECREST 2 E                        32.0                    
TWIN BRIDGES 2 ESE                   26.0                    
DONNER PEAK 1 W                      22.0                    
SOUTH LAKE 1 NNE                     22.0                    
JUNE MOUNTAIN SKI BASE               18.0                    
LONE PINE 11 SW                      17.0                    
MAMMOTH MOUNTAIN SKI BASE            16.0                    
HEAVENLY SKI BASE                    12.0                    
HETCH HETCHY 10 NE                   12.0                    

...NEVADA...
MT CHARLESTON                        12.0                    
MT ROSE SKI BASE                     12.0                    

...Selected preliminary Storm Total Rainfall in inches from 700 AM
PST Wed Jan 04 through 600 AM PST Sat Jan 07...

...CALIFORNIA...
HEARST CASTLE 14.2 NW                8.37                    
GONZALES 15.5 SW                     7.04                    
OLD MAN MOUNTAIN                     6.57                    
FRENCH GULCH                         5.60                    
THREE PEAKS                          5.59                    
LOS GATOS                            4.17                    
UKIAH MUNICIPAL APT                  4.12                    
MORAGA 2.4 NNW                       3.82                    
BURLINGAME 2.0 WSW                   3.71                    
THOUSAND OAKS 2.1 WSW                2.91                    
K6BPM SANTA BARBARA                  2.39                    
ATASCADERO 2.3 NE                    2.31                    
ROHNERT PARK 0.9 SW                  2.30                    
SACRAMENTO INTL APT                  2.18                    
SAN FRANCISCO INTL APT               1.97                    
LOS ANGELES INTL APT                 1.78                    
REDDING MUNICIPAL APT                1.74                    
HOPLAND 8 SSE                        1.50                    
OXNARD NWS                           1.44                    
SANTA BARBARA MUNICIPAL APT          1.20                    

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

...CALIFORNIA...
KIRKWOOD MEADOWS 1.2 S                119                    
GRAPEVINE 3 SSE                       104                    
PULGA 2 NNW                           102                    
PABLO POINT                           101                    
YORKVILLE 5.5 NW                       95                    
CAPETOWN 6 ENE                         94                    
COBB RIDGE WEST                        91                    
ROAD TO RANCHES                        90                    
HIGH GLADE LOOKOUT                     89                    
FERNDALE 6.4 S                         88                    
MAGIC MOUNTAIN TRUCK TRL               87                    
AMERICAN HOUSE 6 NW                    84                    
AGUA DULCE 8 S                         81                    
BIG BEAR CITY 13 ESE                   72                    
MOUNTAIN GATE 3 NNE                    72                    
CRESCENT CITY 1 ESE                    69                    
JULIAN 9 S                             65                    
BLACK MOUNTAIN 7 E                     64                    


The deluge of heavy rain, snow, and strong winds with this
atmospheric river will persist over northern and central
California, with widespread rainfall of 3-5"+ expected through
Sunday. The cumulative effect of additional several inches+ of
rainfall after recent heavy precipitation will lead to
considerable flood impacts across much of central and northern
California, including rapid water rises, rock slides and
mudslides. Minor to isolated major river flooding is expected
through the weekend into next week, with record river levels
possible. Numerous instances of flash flooding and debris flows
are possible over burn scar areas. Furthermore, an additional 1-3
feet of snow is also possible during this event across the Klamath
and Sierra Nevada Ranges, which will lead to dangerous travel
conditions, especially over 4000 feet. Little reprieve from the
excessively wet pattern is expected through midweek as additional
heavy rain, snow, and gusty winds will persist with a more intense
atmospheric river Monday.

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/Russell