Storm Summary Number 3 for West Coast to Upper Midwest Storm System
NWS Weather Prediction Center College Park MD
700 AM PST Sun Jan 01 2023

...Heavy mountain snow and low-elevation rainfall continues across
much of southern California and Intermountain West as system moves
inland...

Winter Storm Warnings and Winter Weather Advisories are in effect
from the Sierra Nevada through much of Nevada, Utah, and Wyoming
and for parts of southern Idaho, western Colorado, northwestern
Nebraska, and the higher elevations of Arizona and New Mexico.

High Wind Warnings are in effect for southwestern New Mexico.

Wind Advisories are in effect for southern California and Nevada
and parts of northwestern and southeastern Arizona.

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

At 600 AM PST...A frontal system was analyzed stretching across
the Intermountain West, with several centers of low pressure
embedded throughout the boundary. The strongest of which being
analyzed near Death Valley National Park in California, with a
central pressure of 998mb (29.47 mmHg). A cold front extended
southward from the low through southern California, while a
stationary boundary stretched northeastward through Nevada and
into the Intermountain West. Latest RADAR and surface observations
indicated that the heaviest axis of preciptation had pushed inland
into extreme southwestern California and Arizona, as southeasterly
flow ahead of the advancing cold front advected anomalously moist
air into the region. Light to moderate precpitation with heavier
high-elevation snow was also reported on the backside of the main
low-pressure center across the westward facing Sierra Nevada
slopes. Elsewhere, snow continued to fall throughout much of the
higher elevations of the Intermountain West, particulary across
the Wasatch Range, Colorado Rockies, and central Wyoming. In
addition to precipitation, impressive wind gusts have been
reported across California and the Great Basin as a result of the
tight pressure gradient across the region.

...Selected preliminary Storm Total Snowfall in inches from 400 AM
PST Sat Dec 30 through 600 AM PST Sun Dec 31...

...CALIFORNIA...
SOUTH LAKE 1 NNE                     39.0                    
LONE PINE 11 SW                      29.0                    
ROUND VALLEY 9 WNW                   27.0                    

...COLORADO...
MONARCH PASS 1 NNW                    7.0                    
MILNER 4 NE                           6.9                    
HAHNS PEAK 1 N                        6.5                    
ROCKWOOD 7 NNW                        5.0                    

...IDAHO...
GENEVA                                9.0                    
BERN                                  8.0                    
ST. ANTHONY                           7.0                    
HOLBROOK 4 NNE                        6.8                    

...MONTANA...
CARROT BASIN                          5.0                    
CLOVER MEADOW                         4.0                    
LONE MOUNTAIN                         4.0                    

...UTAH...
SUNDANCE                             32.0                    
BRIGHTON                             15.0                    
PARK CITY                            14.0                    
SNOWBASIN                            13.0                    
POWDER MOUNTAIN                      11.0                    

...WYOMING...
COKEVILLE 12 NE                      13.0                    
SOUTH ENTRANCE 5 N                   13.0                    
ALTA 6 ENE                           12.0                    
SMOOT 15 ESE                         12.0                    
TURNERVILLE 16 ENE                   12.0                    
CASPER 22 SE                          9.0                    

...Selected preliminary Storm Total Rainfall in inches from 400 AM
PST Sat Dec 30 through 600 AM PST Sun Dec 31...

...CALIFORNIA...
HOMEWOOD                             8.67                    
WHITETHORN 2.4 WSW                   8.56                    
CAMINO 1.2 N                         8.52                    
FRESH POND                           8.40                    
VOLCANO 3.2 N                        8.05                    
SANTA CRUZ 8.9 NW                    7.74                    
PLACERVILLE 0.9 NE                   7.52                    
BLUE CANYON NYACK AIRPORT            7.37                    
WHITETHORN 1.7 NNW                   6.98                    
HELL HOLE                            6.49                    
BALD MTN LOC                         6.33                    
LAYTONVILLE 9.8 NNW                  6.18                    
AVERY                                5.82                    
SOUTH LAKE TAHOE 4.9 SW              5.68                    
MOUNT ZION                           5.45                    
SOUTH FORK EEL RIVER AT LEGGETT      5.44                    
STRAWBERRY VALLEY                    5.42                    
WHITE CLOUD                          5.37                    
MOUNT ELIZABETH                      5.17                    
STEELY FORK                          4.87                    
BEN LOMOND                           4.55                    
PIEDMONT 2 N                         4.45                    
KNEELAND                             3.33                    

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

...CALIFORNIA...
PALISADES TAHOE SUMMIT                160                    
MAMMOTH MOUNTAIN                      116                    
HEAVENLY SKI SUMMIT 1 NNW              99                    
CONWAY SUMMIT                          82                    
CROWLEY LAKE 6 W                       80                    
JAWBONE                                70                    
BIRD SPRINGS PASS                      66                    
HORSE THIEF SPRINGS                    61                    
MAMMOTH YOSETIME AIRPORT               47                    

...NEVADA...
HAWTHORNE 6 NW                         93                    
YERINGTON 5 ENE                        64                    
RENO 2 NW                              55                    

...UTAH...
SCIPIO SUMMIT                          54                    
PAROWAN                                51                    
MONUMENT PEAK                          49                    


Precipitation will continue to wind down across California as the
system pushes inland, with some light to moderate snow continuing
across the southern Sierra Nevada range through the afternoon.
Across the Intermountain West, the heaviest snowfall will remain
confined to the higher elevations (>6000ft) of the Great Basin,
Wasatch Mountains, and Tetons with totals of 1-2+ feet possible.
As the system pushes inland on Sunday into Monday, the energy
associated with it will begin to consolidate across the Rockies,
with low-pressure developing and intensifying before tracking
northeast into the central High Plains on Tuesday, producing a
large swath of moderate to heavy snow, sleet, and freezing rain.

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.

Russell