Storm Summary Number 1 for West Coast to Northern High Plains
Storm System
NWS Weather Prediction Center College Park MD
700 AM PST Sat Dec 31 2022

...A plume of moisture continues to produce moderate to heavy
rainfall across lower elevations of northern California, with
higher elevation snow in the northern Sierra Nevada Range...

Winter Storm Warnings are in effect for the Sierra Nevada Range,
northeastern Utah, southeastern Idaho, the Wasatch Mountains, the
northern Mongollan Rim, the Colorado Rockies, and much of central
Wyoming.

High Wind Warnings are in effect for California's Transverse
Ranges and southeastern Wyoming.

Winter Storm Watches are in effect for western New Mexico,
southwestern Wyoming, northeastern Colorado, and portions of the
northern High Plains.

Flash Flood Watches are in effect for California's Central Valley
& northern coast and north-central Nevada.

Winter Weather Advisories are in effect for northwestern
California, much of central Nevada, central & southern Idaho,
eastern facing slopes of Utah's Wasatch Mountain Range, southern
portion of the Mongollan Rim, central Colorado, and much of
west-central Wyoming.

Wind Advisories are in effect for southern California and Nevada,
the Sangre de Cristo Mountains of New Mexico, and western Texas.

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

At 600 AM PST...A storm system continued to move inland across
northern California and the Great Basin region, with a frontal
boundary analyzed moving south through the region. Continued
onshore flow was producing an axis of moderate to heavy rainfall
stretching from San Francisco eastward through the northern
Central Valley and into the northern Sierra Nevada Range, where
high snow levels (>8500ft) have kept snowfall confined to mountain
peaks. Furthermore, impressive wind gusts across both California
and extreme western Nevada have been reported as a result of the
tightening surface pressure gradient and strong low-level winds
mixing down.

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

...CALIFORNIA...
HOMEWOOD                             8.67                    
BLUE CANYON NYACK AIRPORT            7.37                    
LAYTONVILLE 9.8 NNW                  6.18                    
SOUTH FORK EEL RIVER AT LEGGETT      5.44                    
STEELY FORK                          4.87                    
BEN LOMOND                           4.55                    
KNEELAND                             3.33                    

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

...CALIFORNIA...
MAMMOTH MOUNTAIN                      116                    
HEAVENLY SKI SUMMIT 1 NNW              99                    
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                    


Moderate to heavy preciptation will continue to fall across
California over the next 24 hours, with the heaviest axis shifting
southward through the afternoon. Widespread areal average totals
of 1-2"+ are possible throughout nearly the entierty of the state,
with localized 2-6"+ totals on Pacific-facing mountain slopes,
especially along the Sierra Nevada Range and Tranverse Mountains.
As the system continues to push southward and more inland,
precipitation will expand into the Great Basin this afternoon,
before the region begins to dry out on New Year's Day. Snowfall
will continue to be confined to the highest elevations of
California (>8500ft), however, several feet of snow remains
possible along southern peaks of the Sierra Nevada Range, with
lesser amounts possible (1-2 feet) in higher elevations of the
Great Basin, Wasatch Mountains, and Tetons through tomorrow
morning. As the system tracks through the Intermountain West on
New Year's Day, valley rainfall and higher-elevation snow will
expand into the Southwest and southern & central Rockies, before
the system moves out of the Rockies on Monday and intensifies as
it pushes into the central and northern Plains.

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