The Weather Prediction Center

College Park, MD


Storm Summary Message



Storm Summary Number 6 for Western and Central U.S. Major Winter
Storm System
NWS Weather Prediction Center College Park MD
700 PM PST Wed Dec 15 2021

...A strengthening low pressure system will continue to bring
rain, snow and high winds to the Great Plains and Upper Midwest
through tomorrow...

Winter Storm Warnings are in effect for portions of northern
Minnesota.

Winter Weather Advisories are in effect for portions of the
Central/Northern Rockies, Northern Plains, and the Upper Midwest.

High Wind Warnings are in effect for portions of southern New
Mexico, Central/Southern Rockies, Great Plains, Upper/Middle
Mississippi Valley, and the Upper Great Lakes.

Red Flag Warnings are in effect for the Texas and Oklahoma
panhandle.

Wind Advisories are in effect for portions of the Southern Plains,
Middle Mississippi Valley, Ohio Valley, and the Great Lakes.

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

At 600 PM PST...A deepening low pressure system was centered near
Sioux Falls, SD with a central pressure of 980 mb, or 28.94 inches
of mercury. An associated cold front was observed extending
through the mid-Mississippi valley and into the Southern Plains,
while a warm front extended east into the Upper Midwest and Great
Lakes region. A tight pressure gradient stemming from the strong
low pressure system and potent high pressure to the west has
produced the threat for extreme high winds across the Plains.
Current RADAR and surface observations indicate heavy rain and
severe thunderstorms associated with the cold front currently
progressing eastwards through the Upper Midwest and
mid-Mississippi Valley. Snow is also occurring on the northwest
side of the low-pressure center.

...Selected preliminary Storm Total Snowfall in inches from 800 AM
PST Sat Dec 11 through 600 PM PST Wed Dec 15...

...COLORADO...
DURANGO 0.8 SSW                       2.3                    

...IDAHO...
DONNELLY 5 SW                        46.0                    
WARM LAKE 6 WSW                      27.0                    
GLANDALE 9 ESE                       26.0                    
MEADOWS 6 ENE                        25.0                    
ATLANTA 10 SE                        22.0                    
WEST YELLOWSTONE 6 WNW               18.0                    
HAILEY 2 NNW                         17.0                    
ELK RIVER                            15.0                    
FEATHERVILLE 9 W                     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                    
LAVA HOT SPRINGS 2.9 NNW              6.5                    
WOODLAND 1 E                          6.5                    
INKOM 5.5 N                           5.5                    

...MONTANA...
WEST YELLOWSTONE 6 WNW               18.0                    
DUPUYER 23 SW                        12.0                    
NOXON 12 NE                          12.0                    
REED POINT 5 SE                       5.0                    
ANACONDA 7.4 NW                       3.5                    
GREAT FALLS 6.2 S                     2.9                    

...UTAH...
ALTA                                 23.0                    
BRIGHTON                             17.0                    
PARK CITY                            11.0                    
SALT LAKE CITY                       11.0                    

...WYOMING...
ALPINE 5.9 S                          5.0                    
PINEDALE 13.8 NW                      5.0                    

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

...ARIZONA...
PINAL PEAK                             74                    
HUALAPAI PEAK 3 S                      69                    
GREER 8 WNW                            68                    
WILLIAMS 5 WSW                         68                    
TWEEDS POINT                           64                    
MOUNTAIN SPRINGS GRADE                 63                    
PAGE 2 N                               63                    
SAINT JOHNS 1 NW                       60                    
YUCCA                                  56                    
PHOENIX SKY HARBOR                     51                    

...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                    

...COLORADO...
LAMAR 4 WSW                           107                    
MANITOU 2 SSW                         101                    
AIR FORCE ACADEMY 4 SE                100                    
WHITE RANCH OPEN 3 NNE                 95                    
LOUISVILLE 2 WSW                       93                    
BOULDER 3 SSW                          91                    
ORTIZ 9 W                              77                    
STEAMBOAT SPRINGS 4 ESE                77                    
DOUGLASS PASS 1 W                      76                    
WOLF CREEK PASS 1 ESE                  76                    
MEEKER                                 66                    
EMMA 3 SSW                             64                    

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

...IOWA...
MASON CITY AIRPORT*                    83                    
MISSOURI VALLEY*                       83                    
SERGEANT BLUFF*                        82                    
BUCK GROVE 4 NNE*                      81                    

...KANSAS...
RUSSELL                               100                    
SMITH CENTER 13 NNW                    97                    
CODELL 8 NNE                           95                    
GRANDVIEW PLAZA 1 ENE                  94                    
SALINA                                 91                    
NORTON                                 90                    

...MINNESOTA...
PLAINVIEW                              85                    
MORRISTOWN*                            75                    

...MISSOURI...
CORNING 3 N*                           90                    
TARKIO 1 W*                            90                    
UNIONVILLE*                            80                    

...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                    

...NEBRASKA...
BENNET*                                92                    
GRAND ISLAND*                          85                    

...NEVADA...
HOOVER DAM                             82                    
TIMBER MOUNTAIN                        81                    
ANGEL PEAK                             73                    
DOUBLE H                               71                    
KINGS RIVER VALLEY 11 ESE              71                    
WARM SPRINGS                           71                    
BAKER 4.3 E                            69                    
MERCURY 9.8 NW                         63                    
ELKO 4 WSW                             59                    

...NEW MEXICO...
RED RIVER 9 SSW                       103                    
LAS VEGAS 6 NE                         90                    
FARMINGTON 2 W                         66                    
NAVAJO DAM 12 N                        63                    
ARROYO HONDO 5 S                       61                    
RED HILL 1 N                           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                         64                    

...UTAH...
OGDEN PEAK                             89                    
SNOWBASIN                              89                    
SIGNAL PEAK                            82                    
REYNOLDS PEAK                          80                    
LOGAN PEAK                             76                    
ELGIN 41 NNE                           74                    
SANDY                                  72                    
UPPER CEDAR MOUNTAIN                   71                    
MOAB 16 NW                             70                    
MONTICELLO 2 E                         68                    
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...
BUFORD 2 WNW                           93                    
CENTENNIAL 13 NE                       91                    
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                    

...Selected preliminary Storm Total Snowfall in inches where the
event has ended...

...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                    
ASPENDELL                            28.0                    
CASTLE PEAK                          25.0                    
PONDEROSA                            24.0                    
SUGAR BOWL                           24.0                    
SIERRA SNOW LAB                      23.5                    
CENTRAL SIERRA SNOW LAB              18.7                    
KIRKWOOD                             18.0                    
MOUNT SHASTA 6 ENE                   13.0                    

...COLORADO...
GLENWOOD SPRINGS 0.6 S                3.5                    
PITKIN 1.1 SW                         3.5                    

...NEVADA...
INCLINE VILLAGE 1 NNW                26.5                    
MT. ROSE SKI BASE 3 NE               15.0                    
GARDNERVILLE RANCH 3 WSW             14.5                    
BRISTLECONE SNOTEL                   11.0                    
LEE CANYON SNOTEL                    11.0                    
MT. CHARLESTON 1 ESE                 10.0                    

...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                    

...UTAH...
SANDY 2 NE                           13.8                    
EAST MILLCREEK 0.7 NW                11.0                    
FRUIT HEIGHTS 1.3 N                   9.7                    
SALT LAKE CITY 8.3 WSW                9.2                    

...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 where the
event has ended...

...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                    
BASS LAKE MARINA                     4.43                    
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                    


Over the course of the next 12 hours the low pressure system is
expected to deepen further as it moves north and east through the
Upper Midwest. Snow associated with this system has tapered off
across the western region and Rockies, as the threat has shifted
eastward into the northern Great Plains and Midwest. 3-6 inches of
snow is possible across these areas. In the warm sector of the
streghtening low-pressure system, the severe thunderstorm threat
will continue over the next several hours as atmospheric
conditions remain favorable in supporting the ongoing derecho. The
aforementioned deepening of the system has and will continue to
produce widespread wind gusts of 60 to 70 mph across the Great
Plains and Mississippi Valley, which may result in damage and
widespread power outages. Winds should begin to subside overnight
in the southwestern Plains states as the low-pressure moves
further north and east. These strong wind gusts mixed with
antecedent dry conditions across the Central and Southern Plains
has led to an extremely critical fire danger, which should begin
to wane during the overnight hours.                               
                                                                  
                                       

* Cities noted with an asterisk indicate wind gusts that were
observed in thunderstorms.

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: 1010 PM EST WED DEC 15 2021