Storm Summary Number 1 for Pacific Northwest Winter Storm
NWS Weather Prediction Center College Park MD
700 AM PST Sat Feb 13 2021

...Snow and a wintry mix continue over the Pacific Northwest
before spreading southeast through the western mountain ranges
later today...

Winter Storm Warnings are in effect for eastern and southern
Washington, northern Oregon, southwest and southeast Idaho,
western Wyoming, and the southern Utah mountains.

Winter Weather Advisories are in effect for northern and central
Oregon, large portions of Washington and Idaho, portions of
Northern California, the Sierra Nevada, northeast Nevada, eastern
and southern Wyoming, and the Utah mountain ranges.

Ice Storm Warnings are in effect for northern coastal Oregon.

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

At 600 AM PST...A low pressure center was located approximately 25
miles offshore the southern Washington coast, near 46.8N 125.5W,
with an estimated central pressure of 995mb, or 29.38 inches of
mercury. An occluded front extended northwest, wrapping around a
second low pressure center to the west of Graham Island, BC,
Canada, while a cold front extended onshore, running south through
Oregon and northern California before curving to the west and back
out to sea. Surface observations and doppler radar indicated light
to moderate snow was falling over western Washington, the Cascade
Mountains, along the eastern Washington/Oregon border, and the
Sierra Nevada. Mixed precipitation including rain, sleet, and
freezing rain was also observed over southwest Washington,
portions of northwest Oregon, and the Salem, OR metro area.

...Selected preliminary Storm Total Snowfall in inches from 400 AM
PST Thu Feb 11 through 600 AM PST Sat Feb 13...

...CALIFORNIA...
ALPINE MEADOWS 1 SW                  16.0                    
SODA SPRINGS 2 ENE                   12.0                    
KIRKWOOD MEADOWS 1 SSE               11.0                    
LAKE TAHOE 1 ESE                     11.0                    
TRUCKEE 4 NW                         10.0                    
HOMEWOOD 1 NNW                        8.0                    
MEYERS 2 NW                           4.0                    

...OREGON...
SNOWDEN                               9.7                    
HOOD RIVER 1 SSW                      8.0                    
LEXINGTON 13 SSW                      8.0                    
DAYVILLE 25 SW                        7.0                    
HARDMAN 9 S                           7.0                    
MOSIER 4.4 ESE                        7.0                    
SE JOSEPH                             7.0                    
STARKEY 1 WNW                         7.0                    
PENDLETON 4 SSE                       6.5                    
PORTLAND                              6.2                    
STANFIELD 5 SE                        6.0                    
CASCADE LOCKS                         5.0                    
CITY OF THE DALES 1 SW                5.0                    
HAPPY VALLEY                          5.0                    
HEPPNER                               5.0                    
IONE                                  5.0                    
SISTERS 2.0 WNW                       5.0                    
W MAYVILLE                            4.5                    
MT TABOR 1 NW                         4.0                    
SHANIKO                               4.0                    
BEND 2.3 WSW                          3.8                    
ANTELOPE 6 SSW                        3.5                    
CANYON CITY 12.6 SSW                  3.5                    
MADRAS                                3.5                    
HERMISTON 2 N                         3.1                    
COVE                                  2.8                    
THREE RIVERS 10.4 NNE                 2.0                    

...WASHINGTON...
YELM 7 SE                            12.0                    
MCCLEARY 1 N                         11.0                    
WHITE SALMON 4 ENE                   11.0                    
APPLETON 5 ENE                       10.0                    
CURTIS 4 NE                           9.0                    
CHEHALIS                              7.5                    
OLYMPIA 2 SE                          7.5                    
KENWICK 7.4 W                         7.0                    
ROCHESTER 1 NNE                       7.0                    
TUMWATER 4 WSW                        6.5                    
CLE ELUM                              6.0                    
GRAHAM 1 N                            6.0                    
STELLA 2 SE                           6.0                    
ABERDEEN                              5.0                    
CHEHALIS 7 WSW                        5.0                    
GOLDENDALE                            5.0                    
LONGMIRE                              5.0                    
WALLA WALLA                           5.0                    
THORP 4 ENE                           4.9                    
BRUSH PRARIE 2 NNW                    4.5                    
KENNEWICK 2 E                         4.5                    
YAKIMA 2 WNW                          4.5                    
TROUT LAKE 0.8 SSW                    4.0                    
GIG HARBOR                            3.5                    
SEATTLE 1.3 NNE                       3.5                    
ANATONE 7.6 NW                        2.5                    
HOODSPORT 4 WNW                       2.4                    
VANCOUVER                             2.3                    
SEATTLE-TACOMA AIRPORT                2.2                    
MINERAL                               2.0                    
TOLEDO                                2.0                    
TACOMA                                1.8                    
KIRKLAND                              1.5                    
BREMERTON 1.8 NE                      0.8                    
POMEROY 2.5 SE                        0.7                    
PULLMAN 2 NW                          0.7                    
SEQUIM 1.3 SE                         0.3                    

...Selected preliminary Storm Total Freezing Rain ice amounts in
inches from 400 AM PST Thu Feb 11 through 600 AM PST Sat Feb 13...

...OREGON...
JOHNSON CITY                         0.88                    
MOUNT ANGEL                          0.75                    
AUMSVILLE                            0.50                    
SALEM                                0.30                    
GATES                                0.25                    
LEWISBURG 1 SW                       0.02                    

...WASHINGTON...
OCEAN SHORES 3 N                     0.01                    
WESTPORT                             0.01                    


Over the course of the next 24 hours, the main low pressure center
off the Washington coast will separate from the occluded system to
the northwest and begin moving along a southeastward trajectory
behind a long, winding stationary front extending from the Pacific
Northwest to the Mexico border. As the low pressure center moves,
the connected cold front will also be pulled southward and inland
through the Intermountain West. The movement of this front,
combined with the fresh moisture pulled onshore and the
instability associated with the long stationary front, will bring
continued moderate to heavy snowfall to much of the Pacific
Northwest, the Sierra Nevada, the Northern Great Basin, and the
Northern Rockies. While the Central Great Basin and Central
Rockies will receive snow as well, they will also be subject to
wintry mixed precipitation including rain, sleet, and freezing
rain. Over the next few hours, coastal Oregon will also be at risk
for significant ice accumulations. In all affected locations
travel will be hazardous, particularly in those areas subject to
freezing rain, where roads can become slippery and driving can be
treacherous.


Zavadoff