Storm Summary Number 1 for Major Pacific Coast to High Plains
Storm System
NWS Weather Prediction Center College Park MD
700 PM PST Sat Dec 10 2022

...Heavy precipitation and strong winds continue across the
Pacific Coast, as strong storm system moves ashore...

Winter Storm Warnings are in effect for northwest Washington,
west-central Oregon, the Sierra Nevada and Transverse Mountain
Ranges, the Sawtooth Range of Idaho, central Nevada, and
southwestern Utah.

High Wind Warnings are in effect for portions of southern
California.

Winter Storm Watches are in effect for southwestern Montana, North
Dakota, the western half of South Dakota, extreme northwestern
Minnesota, eastern Wyoming, central Utah, and northern Nebraska.

Winter Weather Advisories are in effect for the Cascade Range of
Oregon, northern California, much of northwestern Nevada, central
Arizona, southwest Utah, central Idaho, western Wyoming, and
central Montana.

Wind Advisories are in effect for southern California, central
Nevada, and western Utah.

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

At 600 PM PST...A potent storm system was moving ashore the
Pacific Coast, with the main low being analyzed nearly 300 miles
west of Washington state in the Pacific Ocean with a central
pressure of 989mb, or 29.21 inches of mercury. An occluded
boundary extended southwestward from the low across the Pacific
Northwest and northern California before connecting to the triple
point located northeast of San Francisco, CA. From the triple
point, a cold front stretched southwestward into the Pacific
Ocean, while a warm front extended southward along the California
coastline. Current surface observations and RADAR indicate that
the heaviest axis of precipitation was located across central
California and extending inland through the Sierra Nevada range,
where heavy snowfall rates as high as 4-5" per hour have been
reported across portions of the higher terrain. Generally, below
4000 feet, much of the preciptation has fallen as rain across
California, with RADAR depicting additional areas of scattered
light to moderate rainfall ongoing across northern portions of the
state, with some pockets of higher elevation snow in the Klamath
and Cascade Ranges. Elsewhere, precipitation was spreading
westward through central Nevada and southern Idaho, with ongoing
lower elevation rainfall and mountain snow. Strong winds were also
being reported across much of California and western Nevada.

...Selected preliminary Storm Total Snowfall in inches from 700 AM
PST Tue Nov 29 through 600 PM PST Fri Dec 02...

...CALIFORNIA...
MT. SHASTA SKI PARK                  21.0                    
WEED 2 SSW                           18.0                    
CARRVILLE 14 N                       10.0                    
RUTH 2 WNW                            1.0                    

...OREGON...
MT. ASHLAND SKI ROAD                  8.0                    
BEND                                  6.0                    
LA PINE 5 NNW                         5.0                    
E DIAMOND LAKE SUMMIT                 4.0                    

...WASHINGTON...
TROUT LAKE 1 SSW                     17.5                    
LEAVENWORTH 1 NNW                    17.0                    
MALOTT 7 WNW                         17.0                    
WAUCONDA 12 S                         9.0                    
FIVE MILE 7 NW                        8.8                    
YAKIMA 2 ENE                          5.0                    

...Selected preliminary Storm Total Rainfall in inches from 700 AM
PST Tue Nov 29 through 600 PM PST Fri Dec 02...

...CALIFORNIA...
BUCKS LAKE 1 NW                      4.44                    
CITRUS HEIGHTS                       3.73                    
WOODLAND                             3.62                    
ARNOLD                               3.48                    
STRAWBERRY VALLEY                    3.48                    
DOWNIEVILLE                          3.33                    
PARADISE 1.1 W                       2.48                    
DE SABLA                             2.36                    
VOLCANO                              2.16                    
LEGGETT                              2.00                    
NOVATO 5 NNW                         1.14                    

...OREGON...
GOLD BEACH                           3.00                    
SELMA                                2.33                    

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

...CALIFORNIA...
HEAVENLY SKI SUMMIT 1 NNW             103                    
MAMMOTH MOUNTAIN SKI                   98                    
WALKER 4 SSW                           93                    
ANTELOPE LAKE 5 NNW                    92                    
FT DICK 5 SE                           60                    
KNEELAND 2 ESE                         57                    
HIGHLANDS 1 SW                         40                    

...NEVADA...
WASHOE CITY 4 NNW                      76                    
STEAD 2 WSW                            73                    
SPARKS 3 SSW                           66                    
GARDENVILLE RANCH 3 WSW                65                    

...OREGON...
PILOT ROCK 9 S                         80                    
TALENT 2 NE                            50                    


Heavy precipitation is expected to continue to fall across
California and the Great Basin region over the next 24-36 hours as
the potent storm system continues to move ashore. The highest
elevations of the Sierra Nevada Range could see snowfall totals of
3-4 feet, with locally greater amounts possible, through Monday
morning, with lesser amounts expected for lower elevations (above
3000ft). For rainfall-related impacts, there is a Slight Risk of
Excessive Rainfall for the central California coast tonight and
for southern California around the greater Los Angeles and San
Diego metropolitan areas on Sunday. Rainfall totals of 2-4 inches,
locally higher, as well as the potential for heavier rainfall
rates over 0.5 inches per hour may lead to some scattered
instances of flooding. As the system tracks eastward,
precipitation will overspread much of the Great Basin, central
Rockies, and portions of the Southwest on Sunday, with higher
elevations forecast to see 6-12" of snow through Monday. The
system will then eject out into the central Plains on Tuesday,
where a developing low-pressure will track eastward, leading to
heavy snow and possible blizzard conditions across portions of the
central and northern High Plains through Wednesday.

The next Storm Summary will be issued by the Weather Prediction
Center at 700 AM PST. Please refer to your local National Weather
Service office for additional information on this event.

Russell