The Weather Prediction Center

College Park, MD


Storm Summary Message



Storm Summary Number 4 for Western and Central U.S. Major Winter
Storm System
NWS Weather Prediction Center College Park MD
700 PM PST Tue Dec 14 2021

...Atmospheric River continues to bring heavy rain and snow to
California as a broader snow and high wind threat expands across
the western and central U.S..... 

Winter Storm Warnings are in effect for the Sierra Nevada and
Transverse and Peninsular ranges of California, portions of the
Sierra Nevada and Great Basin in Nevada, the Sawtooth Mountains in
Idaho, southwest Montana, the Wasatch and Uinta mountains in Utah,
the Mogollon Rim and northeastern Arizona, and the San Juan
Mountains of Colorado.

High Wind Warnings are in effect for the Transverse and Peninsular
Ranges of California, the Mogollon Rim and northeastern Arizona,
the Wyoming Basin, the High and Central Plains of the Texas
Panhandle, Oklahoma Panhandle, Colorado, Kansas, Wyoming,
Nebraska, South Dakota, the Mid-Missouri Valley and the western
Great Lakes.

Red Flag Warnings are in effect for northeastern New Mexico and
extreme south-central Kansas.

High Wind Watches are in effect for portions of the Texas
Panhandle through the eastern Oklahoma panhandle and the Upper
Great Lakes.

Winter Weather Advisories are in effect for the coastal ranges and
Cascades of Oregon, southwestern Washington, northern Great Basin
of Nevada, portions of the Northern and Central Rockies, the High
Plains of Montana, and northeastern South Dakota.

Wind Advisories are in effect for southern California,
south-eastern Utah, southern Arizona, the Rio Grande Valley of New
Mexico, north-central Texas, the Mid-Mississippi valley and
central Minnesota.

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

At 600 PM PST...A broad, deep upper-level trough has slowly
progressed eastward over the West Coast. At the surface, an
eastward meandering frontal boundary extended across the central
and western U.S. from the northern Plains west through the
Northern Rockies before turning south through the Great Basin and
into central California. Significant moisture associated with an
Atmospheric River continued to spread inland behind and across
this boundary. Widespread areas of heavy rain and higher elevation
snow showers were ongoing along and ahead of the frontal boundary
across the Northern Rockies in Montana and Idaho, the Great Basin
in Utah, and south into southern Nevada and western Arizona. The
heaviest precipitation has moved east of the Los Angeles metro
area and southern California, with strong winds possible in its
wake, subsiding overnight.

...Selected preliminary Storm Total Snowfall in inches from 800 AM
PST Sat Dec 11 through 600 PM PST Tue Dec 14...

...CALIFORNIA...
PINECREST 2 E                        60.0                    
SODA SPRINGS 1 ENE                   54.8                    
BEAR VALLEY 2 N                      54.0                    
HEAVENLY SKI BASE                    50.0                    
PALISADES TAHOE SKI BASE             50.0                    
MAMMOTH MOUNTAIN SKI                 48.0                    
HOMEWOOD MOUNTAIN SKI                45.0                    
NORTHSTAR SKI BASE 1 SSW             44.0                    
KINGVALE 1 WSW                       34.0                    
CASTLE PEAK                          25.0                    
SUGAR BOWL                           24.0                    
SIERRA SNOW LAB                      23.5                    
CENTRAL SIERRA SNOW LAB              18.7                    
KIRKWOOD                             18.0                    
MOUNT SHASTA 6 ENE                   13.0                    

...IDAHO...
DONNELLY 3 SSW                       20.0                    
NEW MEADOWS 2 NNW                    19.5                    
WEST YELLOWSTONE 6 WNW               18.0                    
HAILEY 2 NNW                         17.0                    
ELK RIVER                            15.0                    
GANNETT 10 NE                        14.0                    
HORSESHOE BEND 11 SSE                13.0                    
PIONEERVILLE 9 ESE                   12.0                    
BELLEVUE 1 WSW                       11.0                    
ARCO                                  7.0                    
WOODLAND 1 E                          6.5                    

...MONTANA...
DUPUYER 23 SW                        12.0                    
NOXON 12 NE                          12.0                    

...NEVADA...
INCLINE VILLAGE 1 NNW                26.5                    
MT. ROSE SKI BASE 3 NE               15.0                    
GARDNERVILLE RANCH 3 WSW             14.5                    

...OREGON...
SUMMIT LAKE                          33.0                    
TIMBERLINE LODGE                     31.0                    
MOUNT HOOD MEADOWS                   28.0                    
SANTIAM PASS                         25.0                    
GOVERNMENT CAMP                      18.0                    
HALFWAY 9 NNW                        18.0                    
WHITE RIVER                          18.0                    
CRATER LAKE 1 SW                     16.0                    
JOSEPH 3 S                           15.0                    
SADDLE MOUNTAIN                      14.0                    
SALT CREEK FALLS                     13.0                    
TOLLGATE                             13.0                    
CRESCENT 1 W                         10.0                    
SUMPTER 6 N                           9.0                    
CLACKAMAS LAKE                        8.0                    
HAYES HILL                            6.0                    

...WASHINGTON...
SWIFT CREEK                          27.0                    
LONE PINE                            26.0                    
JUNE LAKE                            25.0                    
SPIRIT LAKE                          21.0                    
SPENCER MEADOW                       19.0                    
WINTON 3 NW                          14.0                    
LUCERNE 9 W                          10.5                    
MAZAMA 2 NW                           8.3                    
EASTON 6 NNW                          7.0                    
STEVENS PASS                          6.0                    

...Selected preliminary Storm Total Rainfall in inches from 800 AM
PST Sat Dec 11 through 600 PM PST Tue Dec 14...

...CALIFORNIA...
MOUNT TAMALPAIS                      8.74                    
SCOTTS VALLEY                        6.05                    
SCOTT CREEK                          5.84                    
WOODACRE                             5.84                    
BEN LOMOND                           5.68                    
PARADISE 1.1 W                       5.53                    
KENTFIELD                            5.36                    
STRAWBERRY VALLEY                    5.30                    
GASQUET                              4.86                    
RED MOUND                            4.56                    
DOWNIEVILLE                          4.53                    
FLYNN PRAIRIE                        4.37                    
DE SABLA                             3.93                    
SPRING VALLEY                        3.86                    
WHISKEYTOWN 1.6 S                    3.80                    
AMERICAN HOUSE 7.6 SW                3.76                    
SIMS                                 3.51                    
ELMIRA                               3.25                    
BLUE CANYON                          3.18                    
ARNOLD                               2.40                    
SAN FRANCISCO                        2.37                    
SACRAMENTO                           1.49                    

...OREGON...
SOUTH SLOUGH ESTUARY COOS BAY        2.81                    
PORT ORFORD 4.7 E                    2.34                    
SELMA                                2.28                    
MURPHY 1 SSE                         1.54                    
BANDON 3 NE                          1.42                    
GLENDALE                             1.39                    

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

...CALIFORNIA...
MAGIC MOUNTAIN TRUCK TRAIL             89                    
LAGUNA LAUNCH                          88                    
RUNNING SPRINGS 2 NW                   84                    
ACTON 8 NW                             82                    
GRAPEVINE PEAK                         82                    
SIERRA PELONA WEST                     82                    
BIG PINES 1 E                          81                    
FALCON RD                              68                    
TV TOWERS RD 2                         68                    
JOAQUIN RIDGE                          65                    
LAS YEGUAS                             62                    
DE LA CONCEPCION                       60                    
CRANE FLAT                             58                    
SAN LUIS OBISPO 2 ENE                  58                    
VENTURA GOVT CENTER                    58                    
CHOLAME                                57                    
SADDLE PEAK                            57                    
MILLER RANCH                           55                    
CUYAMA VALLEY                          52                    

...IDAHO...
POCATELLO REGIONAL AIRPORT             68                    
TWIN FALLS 6 S                         67                    
GRANGEVILLE 2 N                        60                    
WINCHESTER 5 NW                        59                    

...MONTANA...
EAST GLACIER PARK 8 SE                 92                    
BYNUM 14 W                             86                    
WILSALL 17 NE                          78                    
SUNBURST                               75                    
DENTON 7 ENE                           68                    
LIVINGSTON 2 WSW                       68                    
ZORTMAN 10 ESE                         65                    
GREAT FALLS 5 WSW                      62                    

...NEVADA...
TIMBER MOUNTAIN                        81                    
KINGS RIVER VALLEY 11 ESE              71                    
WARM SPRINGS                           71                    
ELKO 4 WSW                             59                    

...OREGON...
LINCOLN CITY                           93                    
YAQUINA BAY BRIDGE                     78                    
HEBO 5 ESE                             75                    
YACHATS 2 SE                           72                    
ASTORIA 1 W                            68                    
ROCKHOUSE RAWS                         61                    
GARIBALDI 2 WNW                        59                    
SALEM AIRPORT                          47                    
PORTLAND                               45                    

...SOUTH DAKOTA...
SPEARFISH 3 SE                         56                    

...UTAH...
SNOWBASIN                              89                    
OGDEN PEAK                             82                    
REYNOLDS PEAK                          80                    
SANDY                                  72                    
SIGNAL PEAK                            69                    
UPPER CEDAR MOUNTAIN                   67                    
WINDY PEAK                             64                    
I-15 AT HMILTONS FORT                  61                    
TOOELE 2                               58                    
TULE VALLEY                            57                    
FREMONT ISLAND - MILLER HILL           52                    
COTTONWOOD MOUNTAIN                    41                    

...WASHINGTON...
RICHLAND 22 NNW                        78                    
WALLA WALLA AIRPORT                    62                    
POMEROY                                58                    
LOOMIS 5 S                             49                    
SPOKANE SOUTH HILL                     42                    

...WYOMING...
BORDEAUX 1 SSE                         88                    
CASPER 2.1 SW                          88                    
ARLINGTON 7 ESE                        85                    
RED CANYON - SOUTH PASS                82                    
CLARK                                  80                    
CENTENNIAL 2 WNW                       77                    
I25 - HAT SIX                          77                    
MILLS 6 NW                             66                    
CHEYENNE 1 NW                          64                    
BIG HORN 17 WSW                        60                    
GELNROCK 1 S                           58                    


Heavy precipitation in the form of both rain and snow has subsided
in southern California as the heaviest axis has progressed
eastward towards the central Great Basin and northern Rockies.
Another batch of heavy precipitation is possible for central and
northern California through Thursday morning as another surge of
moisture associated with a weak low-pressure system moves eastward
towards the Pacific Northwest. An additional 1-3 feet of snow is
possible for the Sierra Nevada range, with 1-2 inches of rain in
lower elevations. Higher elevations in the Central Great Basin and
North and Central Rockies may see 12+ inches of snow through
Wednesday night as the eastward moving moisture associated with
the upper-level trough interacts with the frontal boundary draped
across the region. Lighter accumulations are possible elsewhere at
lower elevations. Additionally, a broader high wind threat will
expand across the Plains in advance of the upper-level trough
moving eastward. A deepening low-pressure system over the Northern
High Plains on Wednesday will lead to widespread gusts of 60 to 70
mph across a broad area of the central Plains and Mississippi
Valley, which may result in damage and power outages. Dry
conditions across the Plains will also lead to the threat of
wildfires on 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




Last Updated: 1005 PM EST TUE DEC 14 2021