The Weather Prediction Center
College Park, MD
Storm Summary Message
Storm Summary Number 3 for Western and Central U.S. Major Winter
Storm System
NWS Weather Prediction Center College Park MD
700 AM 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 Great Basin of Utah; the Mogollon Rim
and northeastern Arizona; the Wyoming Basin; the High and Central
Plains of the Texas Panhandle, Oklahoma Panhandle, Colorado,
Kansas, Wyoming, Nebraska, and South Dakota; and the Mid-Missouri
Valley.
Red Flag Warnings are in effect for northeastern New Mexico.
Winter Storm Watches are in effect for the Klamath Mountains of
California.
High Wind Watches are in effect for the Sangre De Cristo and
Sandia Mountains and Colorado Plateau of New Mexico, portions of
the Texas Panhandle through southeastern Kansas, southern portions
of the Upper Missouri Valley, and the Upper Mississippi Valley.
Winter Weather Advisories are in effect for the coastal ranges and
Cascades of Oregon, northern Great Basin of Nevada, portions of
the Northern and Central Rockies, the High Plains of Montana, and
northeastern South Dakota.
Flood Advisories are in effect for the Sacramento Valley, Southern
Coast Ranges, and the greater Los Angeles area in California.
For a detailed graphical depiction of the latest watches, warnings
and advisories, please see www.weather.gov
At 600 AM PST...A broad, deep upper-level trough continued slowly
east over the West Coast. At the surface, a slowly 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 Nevada,
and south into California including the Sierra Nevada, the central
valleys, the Southern Coast Ranges, and the greater Los Angeles
area. In particular, waves of heavy precipitation in the form of
rain and higher elevation snow were moving inland from the Pacific
over the southern Sierra Nevada, San Joaquin Valley, and the San
Gabriel and San Bernardino mountains north of Los Angeles.
...Selected preliminary Storm Total Snowfall in inches from 800 AM
PST Sat Dec 11 through 600 AM PST Tue Dec 14...
...CALIFORNIA...
CASTLE PEAK 25.0
SUGAR BOWL 24.0
SIERRA SNOW LAB 23.5
HOMEWOOD 22.0
CENTRAL SIERRA SNOW LAB 18.7
SODA SPRINGS 1 ENE 18.7
KIRKWOOD 18.0
MOUNT SHASTA 6 ENE 13.0
...IDAHO...
DONNELLY 3 SSW 20.0
NEW MEADOWS 2 NNW 19.5
ELK RIVER 15.0
GANNETT 10 NE 14.0
WEST YELLOWSTONE 6 WNW 14.0
HORSESHOE BEND 11 SSE 13.0
PIONEERVILLE 9 ESE 12.0
BELLEVUE 1 WSW 11.0
HAILEY 2 NNW 10.0
ARCO 7.0
WOODLAND 1 E 6.5
...MONTANA...
DUPUYER 23 SW 12.0
NOXON 12 NE 12.0
...NEVADA...
INCLINE VILLAGE 1 NNW 14.0
...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
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 AM 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
SIERRA PELONA WEST 82
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...
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...
OGDEN PEAK 82
REYNOLDS PEAK 80
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
CLARK 80
CENTENNIAL 2 WNW 77
I25 - HAT SIX 77
RED CANYON - SOUTH PASS 72
CHEYENNE 1 NW 64
BIG HORN 17 WSW 60
GELNROCK 1 S 58
Heavy precipitation in the form of both rain and snow will
continue across California as the Atmospheric River brings in
additional surges of significant moisture. Another 1-3 feet of
snow is forecast for the Sierra Nevada. There is also a Slight
Risk of Excessive Rainfall in effect for Southern California where
an additional 2-5 inches of rain is forecast, particularly for the
mountains surrounding the Los Angeles and San Diego metro areas.
This remains a threat for debris flows over burn scars. As the
upper-level trough and surface front continue eastward across the
West, snow will expand in coverage across the Great Basin and the
Rockies. The heaviest snow should remain in the higher terrain,
with up 12 + inches of snow possible for many of the regional
mountain ranges. 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. Widespread gusts of 60 to 70 mph are likely and
may result in damage and power outages. Dry conditions across the
Plains will also lead to the threat of wildfires both Tuesday and
Wednesday.
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.
Putnam
Last Updated: 1139 AM EST TUE DEC 14 2021