Storm Summary Number 3 for West Coast Multi-Hazard Atmospheric
River Events...Corrected
NWS Weather Prediction Center College Park MD
700 AM PST Fri Jan 06 2023

Corrected for Geographical Reference.

...Heavy rain/snow and high winds anticipated as the next
Atmospheric River arrives today...

Winter Storm Warnings are in effect for portions of the Sierra
Nevada, Transverse Range, western Nevada, and the higher
elevations of Utah.

Winter Weather Advisories are in effect for portions of the The
Caribou Range and portions of the Front Range.

Winter Storm Watches are in effect for portions of the central and
southern Sierra Nevada.

Flood Watches are in effect for much of the Central Valley of
California.

High Wind Warnings and Wind Advisories are in effect for portions
of California and Oregon.

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

At 600 AM PST...The original low pressure center that brought the
initial atmospheric river is now weakening, with a minimum
pressure of 984mb (29.05 in Hg) is located about 350 miles (600
km) south of Juneau, AK. However, new dominant low pressure
center, with a minimum pressure of 976 mb (28.82 in Hg) is located
about 750 miles west of Portland, OR. This new dominant low
contains a wide swath of heavy precipitation currently making its
way toward the California/Oregon coastline. Latest surface
observations and RADAR indicate relatively dry conditions across
much of central and southern California with some light to
moderate precipitation falling over northern California. There is
also some moderate rain and snow falling ahead of the original
frontal boundary in the Intermountain West, particularly in
southeastern Idaho, northern Utah, and western Colorado.

...Selected preliminary Storm Total Snowfall in inches from 700 AM
PST Wed Jan 04 through 600 AM PST Fri Jan 06...

...CALIFORNIA...
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                    

...UTAH...
BRIGHTON                             17.0                    
ALTA                                 10.0                    

...Selected preliminary Storm Total Rainfall in inches from 700 AM
PST Wed Jan 04 through 600 AM PST Fri Jan 06...

...CALIFORNIA...
OLD MAN MOUNTAIN                     6.57                    
FRENCH GULCH                         5.60                    
THREE PEAKS                          5.59                    
LOS GATOS                            4.17                    
MORAGA 2.4 NNW                       3.82                    
BURLINGAME 2.0 WSW                   3.71                    
UKIAH MUNICIPAL APT                  3.21                    
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                  2.16                    
SAN FRANCISCO INTL APT               1.97                    
LOS ANGELES INTL APT                 1.60                    
HOPLAND 8 SSE                        1.50                    
OXNARD NWS                           1.44                    
SANTA BARBARA MUNICIPAL APT          1.20                    
REDDING MUNICIPAL APT                1.17                    

...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                    


Precipitation associated with the first atmospheric river has
mostly subsided by this morning, but the next atmospheric river
event is forecast to arrive tonight into northern California,
before spreading southward to the central portion of the state on
Saturday. Widespread additional rainfall of 3-5+", with locally
heavier cases possible, is expected tonight and into this weekend
from this next atmospheric river event. Though these are lesser
accumulations than the previous atmospheric river, the cumulative
effect of an additonal several inches of rainfall after recent
heavy precipitation will lead to considerable flood impacts this
weekend, including rapid water rises and mudslides over northern
and central California. Additionally, flash flooding and debris
flows are possible over burn scar areas. An additional 1-2 feet of
snow this weekend over the Klamath Mountains and Sierra Nevada
will lead to dangerous travel conditions, especially over 5000
feet.

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.

Genz