Storm Summary Number 2 for Major Pacific Coast to High Plains
Storm System
NWS Weather Prediction Center College Park MD
700 PM PST Sun Dec 11 2022

...Heavy precipitation and strong winds continue across the
western region, as strong storm system continues to track
inland...

Blizzard Warnings are in effect for eastern Wyoming and
northwestern Nebraska.

Winter Storm Warnings are in effect for west-central Oregon, the
Sierra Nevada and Transverse Mountain Ranges, the Sawtooth Range
of Idaho, western Nevada, central Utah, southwestern Colorado,
central Wyoming, and southeastern Montana.

High Wind Warnings are in effect for southwestern Utah and central
New Mexico.

Winter Storm Watches are in effect for southeastern Montana, North
Dakota, much of South Dakota, extreme western and central
Minnesota, eastern Wyoming, northeastern Colorado, and
northernwestern Nebraska.

Winter Weather Advisories are in effect for the Cascade Range of
Oregon, northern California, northeastern Nevada, much of Arizona,
eastern Utah, central Idaho, western Wyoming, western Montana, the
Colorado Rockies, and northwestern New Mexico.

Wind Advisories are in effect for southern California, extreme
southeastern Nevada, western Utah, and central New Mexico.

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 through the
western portion of the Great Basin, with the main low being
analyzed in south-central Idaho with a central pressure of 999mb,
or 29.50 inches of mercury. An occluded boundary extended
southwestward from the low across northern Utah connecting to the
triple point located on the northwestern shore of the Great Salt
Lake. From the triple point, a cold front stretched southwestward
through western Utah and southern California, while a stationary
front extended eastward through northwestern Utah. Current surface
observations and RADAR continue to show widespread areas of
preciptation across the Pacific Coast and Intermountain West
associated with the deep upper-level low that is driving that
system tracking across the region. Furthermore, onshore flow on
the southern flank of a surface low located off the northern
California coast was producing an axis of moderate preciptation
across north-central portions of the state, with higher elevation
snow being reported across the Northern Coast and Klamath Mountain
ranges. Further east, ahead of the advancing storm system, RADAR
indicated preciptation falling along a north-south axis extending
from southern Idaho through Utah and into western Arizona, with
snow being reported in the higher elevations (above 5000ft).
Strong wind gusts were also occurring across the region.

...Selected preliminary Storm Total Snowfall in inches from 700 AM
PST Tue Dec 11 through 600 PM PST Fri Dec 12...

...CALIFORNIA...
SODA SPRINGS 2 ENE                   60.0                    
TWIN BRIDGES 2 ESE                   48.0                    
TAHOE-DONNER                         46.0                    
PALISADES TAHOE SKI BASE             44.0                    
PINECREST 2 E                        39.0                    
MAMMOTH MOUNTAIN SKI BASE            30.0                    
ASPENDELL                            24.5                    
MT. SHASTA SKI PARK                  21.0                    
WEED 2 SSW                           18.0                    
CARRVILLE 14 N                       10.0                    

...IDAHO...
SUN VALLEY 2 SW                      17.0                    
FEATHERVILLE                         14.0                    
BOISE 16 NNE                         13.0                    
DOVER 2 WNW                          10.2                    

...NEVADA...
MT. ROSE SKI BASE                    48.0                    
SKY TAVERN                           43.0                    
DIAMOND PEAK SKI BASE                42.0                    
INCLINE VILLAGE 1 NNW                38.0                    
ZEPHYR COVE                          30.0                    
VIRGINIA CITY 3 NNW                  21.0                    
RENO 4 SW                            12.0                    

...OREGON...
REDMOND 8 ESE                        10.5                    
MT. ASHLAND SKI ROAD                  8.0                    
BEND                                  6.0                    
MADRAS                                6.0                    
LA PINE 5 NNW                         5.0                    
E DIAMOND LAKE SUMMIT                 4.0                    

...WASHINGTON...
FORTY-NINE DEGREES NORTH             22.0                    
LEAVENWORTH 2 SSW                    20.5                    
TROUT LAKE 1 SSW                     17.5                    
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 Dec 11 through 600 PM PST Fri Dec 12...

...CALIFORNIA...
FIDDLETOWN 3.5 SE                    5.10                    
VOLCANO 3.7 N                        4.87                    
OJAI 5.9 E                           4.76                    
BUCKS LAKE 1 NW                      4.44                    
BOULDER CREEK 3 NW                   4.38                    
EBBETTS PASS                         4.30                    
CITRUS HEIGHTS                       3.73                    
WOODLAND                             3.62                    
ARNOLD                               3.48                    
STRAWBERRY VALLEY                    3.48                    
LA CRESCENTA-MONTROSE 1.2 SW         3.34                    
DOWNIEVILLE                          3.33                    
PARADISE 1.1 W                       2.48                    
DE SABLA                             2.36                    
VOLCANO                              2.16                    
LEGGETT                              2.00                    
SOUTH PASADENA 0.9 SSW               1.92                    
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                    
AGUA DULCE 6 NE                        89                    
CRESTLINE 2 NNE                        84                    
BIG PINES 4 NNW                        80                    
SAN LUIS OBISPO 4 NE                   80                    
LYTLE CREEK 7 NNE                      77                    
FT DICK 5 SE                           60                    
KNEELAND 2 ESE                         57                    
HIGHLANDS 1 SW                         40                    

...MONTANA...
BIG SKY 6 WSW                          67                    
EMIGRANT 10.7 W                        66                    
LIVINGSTON 2 WSW                       63                    
LIMA 4 NE                              57                    

...NEVADA...
WASHOE CITY 4 NNW                      76                    
GREAT BASIN NP 3 WSW                   75                    
MT. CHARLESTON 6 NE                    75                    
STEAD 2 WSW                            73                    
SPARKS 3 SSW                           66                    
GARDENVILLE RANCH 3 WSW                65                    

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

...UTAH...
LOFTY LAKE PEAK                        81                    
CENTRAL WASATCH PEAKS                  79                    
REYNOLDS PEAK                          75                    
SIGNAL PEAK                            69                    
CEDAR CITY                             62                    
MONUMENT PEAK                          60                    


Across California, precipitation is forecast to push south as the
surface low tracks along the coast before weakening on Monday,
with additional rainfall amounts expected to remain below one
inch. Localized higher amounts will be possible, especially in the
northern portion of the state. Further east, precipitation is
expected to continue to fall across the Great Basin and
Intermountain West regions over the next 24-36 hours as the potent
storm system continues to track eastward, with 1-3 feet of snow
forecast to fall in the higher elevations of the region. 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. A rather broad
swath of 12"+ of snow is forecast to fall along an axis extending
from southwestern Nebraska northward through South Dakota, North
Dakota, and eastern Montana, with localized areas potentially
receiving over 2 feet of snow, especially across southern South
Dakota. Multiple days of significant impacts to travel and
infrastructure is expected due to snow, blowing snow, and freezing
rain, with travel becoming impossible at times.

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