Storm Summary Number 8 for West Coast Multi-Hazard Atmospheric
River Events
NWS Weather Prediction Center College Park MD
700 PM PST Sun Jan 08 2023

...Brief reprieve from heavy rain/snow and high winds across
California as next Atmospheric River event set to move onshore
late tonight into Monday...

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

High Wind Warnings are in effect for much of coastal California,
the Central Valley, and southern coastal Oregon.

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

Winter Storm Watches are in effect for northwestern Nevada.

Winter Weather Advisories are in effect for much of northern
Nevada and the Wasatch Range of Utah.

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

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

At 600 PM PST...Latest surface observations and RADAR detected
light precipitation falling across coastal California ahead of the
next Atmospheric River event that is expected to move onshore late
tonight into Monday. Further north, light to moderate
precipitation was reported across coastal Washington as onshore
flow on the south side of a weakening low-pressure center produced
high-elevation snow and valley rainfall.

...Selected preliminary Storm Total Snowfall in inches from 700 AM
PST Wed Jan 04 through 600 PM PST Sat Jan 08...

...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                    

...WASHINGTON...
LEAVENWORTH 1 NNE                     7.0                    
TWISP 3 SE                            5.3                    
MAZAMA 6 ESE                          4.0                    

...Selected preliminary Storm Total Rainfall in inches from 700 AM
PST Wed Jan 04 through 600 PM PST Sat Jan 08...

...CALIFORNIA...
STOUTS MEADOW                        9.72                    
SUGARLOAF                            9.70                    
LAKE COUNTY RAWS                     9.27                    
OAK MOUNTAIN                         8.46                    
HEARST CASTLE 14.2 NW                8.37                    
PINYON CREEK                         8.35                    
MOUNT SHASTA                         7.74                    
GONZALES 15.5 SW                     7.04                    
OLD MAN MOUNTAIN                     6.57                    
UKIAH MUNICIPAL APT                  6.33                    
HONEYDEW                             6.08                    
SIMS                                 5.85                    
FRENCH GULCH                         5.60                    
THREE PEAKS                          5.59                    
SACRAMENTO INTL APT                  3.12                    
SAN FRANCISCO INTL APT               2.84                    
LOS ANGELES INTL APT                 1.78                    

...OREGON...
LEBANON                              7.59                    
QUAIL PRAIRE LOOKOUT                 5.37                    
CANNIBAL MOUNTAIN                    4.30                    
CEDAR                                2.25                    

...WASHINGTON...
JEFFERSON CREEK                      9.67                    
MOUNT CRAG                           5.10                    
HUMPTULIIPS                          4.89                    
OWL MOUNTAIN                         4.32                    
HUCKLEBERRY RIDGE                    2.11                    
MT. BAKER - HEATHER MEADOWS          1.97                    

...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 next powerful Atmospheric River event is forecast to arrive
late tonight and continue through Tuesday over California and
western Nevada. Additional heavy rainfall, heavy mountain snow,
and damaging winds are expected during the event, leading to
possible flash flooding and debris flows over burn scar areas. The
cumulative effect of successive heavy rain events will lead to
additional considerable flood impacts, including rapid water rises
and mud slides over northern and central California, as well as
far western Nevada. Isolated major river flooding is expected
through much of this week, with record high river levels possible.

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.

Russell