Alert archive / Washington / Winter Storm Warnings in 2021

Winter Storm Warning 15, NWS Seattle, WA

December 10, 2021

NWS Seattle, WA issued this winter storm warning at Dec 10, 2021, 4:19 AM PST. It took effect at Dec 10, 2021, 6:00 PM PST. It was in force for 34 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 10, 2021, 4:19 AM PST (12:19 UTC)
In effect from: Dec 10, 2021, 6:00 PM PST
Expired: Dec 12, 2021, 4:00 AM PST
In force: 34 hr
Issued by: NWS Seattle, WA

The text

As transmitted.

654 
WWUS46 KSEW 101219
WSWSEW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
419 AM PST Fri Dec 10 2021

WAZ513-567>569-110015-
/O.UPG.KSEW.WS.A.0008.211211T0600Z-211212T0600Z/
/O.NEW.KSEW.WS.W.0015.211211T0200Z-211212T1200Z/
Olympics-Cascades of Whatcom and Skagit Counties-
Cascades of Snohomish and King Counties-
Cascades of Pierce and Lewis Counties-
including Hurricane Ridge, Newhalem, Stevens Pass, 
Snoqualmie Pass, Paradise, and Longmire
419 AM PST Fri Dec 10 2021

...WINTER STORM WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON
SATURDAY ABOVE 3000 FEET...
...WINTER STORM WARNING IN EFFECT FROM NOON SATURDAY to 4 AM
SUNDAY ABOVE 2000 FEET...

* WHAT...Heavy snow expected above 3000 feet tonight and Saturday
  morning. Heavy snow expected above 2000 feet Saturday afternoon
  through early Sunday morning. Total new snow accumulations of 18
  to 36 inches. Winds gusting as high as 50 mph tonight and
  Saturday. Possible freezing rain Snoqualmie pass tonight into
  Saturday morning. 

* WHERE...Olympic mountains including Hurricane Ridge. Cascade
  mountains of Whatcom, Skagit, Snohomish, King, Pierce and Lewis
  counties including the Mount Baker Ski Area, Stevens Pass and
  Snoqualmie Pass, the Crystal Mountain Ski Area and Paradise on
  Mount Rainier.

* WHEN...From 6 PM this evening to 4 AM PST Sunday.

* IMPACTS...Travel will be very difficult. Gusty winds could 
  bring down tree branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

For the latest road conditions in Washington state, call 5 1 1.

&&

$$

http://www.weather.gov/seattle

6 follow-up statements

025 
WWUS46 KSEW 102237
WSWSEW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
237 PM PST Fri Dec 10 2021

WAZ513-567>569-110645-
/O.CON.KSEW.WS.W.0015.211211T0200Z-211212T1200Z/
Olympics-Cascades of Whatcom and Skagit Counties-
Cascades of Snohomish and King Counties-
Cascades of Pierce and Lewis Counties-
including Hurricane Ridge, Newhalem, Stevens Pass, 
Snoqualmie Pass, Paradise, and Longmire
237 PM PST Fri Dec 10 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 4 AM PST SUNDAY ABOVE 3000 FEET...

* WHAT...Heavy snow expected above 3000 feet tonight and Saturday
  morning. Heavy snow expected above 2000 feet Saturday afternoon
  through early Sunday morning. Total new snow accumulations of 18
  to 36 inches. Winds gusting as high as 50 mph tonight and
  Saturday. Slight chance of freezing rain Snoqualmie pass 
  tonight into Saturday morning. 

* WHERE...Olympic mountains including Hurricane Ridge. Cascade
  mountains of Whatcom, Skagit, Snohomish, King, Pierce and Lewis
  counties including the Mount Baker Ski Area, Stevens Pass and
  Snoqualmie Pass, the Crystal Mountain Ski Area and Paradise on
  Mount Rainier.

* WHEN...From 6 PM this evening to 4 AM PST Sunday.

* IMPACTS...Travel could be very difficult. Gusty winds could 
  bring down tree branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

For the latest road conditions in Washington state, call 5 1 1.

&&

$$

http://www.weather.gov/seattle

253 
WWUS46 KSEW 110431
WSWSEW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
831 PM PST Fri Dec 10 2021

WAZ513-567>569-111245-
/O.CON.KSEW.WS.W.0015.000000T0000Z-211212T1200Z/
Olympics-Cascades of Whatcom and Skagit Counties-
Cascades of Snohomish and King Counties-
Cascades of Pierce and Lewis Counties-
including Hurricane Ridge, Newhalem, Stevens Pass, 
Snoqualmie Pass, Paradise, and Longmire
831 PM PST Fri Dec 10 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST SUNDAY
ABOVE 3000 FEET...

* WHAT...Heavy snow continued above 3000 feet tonight and Saturday
  morning then above 2000 feet Saturday afternoon and night. Total
  snow accumulations of 18 to 36 inches. Winds gusting as high as 
  50 mph.

* WHERE...Cascade mountains of Whatcom and Skagit Counties,
  including the Mount Baker Ski Area, Olympic mountains including
  Hurricane Ridge, Cascade mountains of Pierce and Lewis Counties,
  including the Crystal Mountain Ski Area, Paradise on Mount
  Rainier, Cascade mountains of Snohomish and King Counties,
  including Stevens Pass and Snoqualmie Pass.

* WHEN...Until 4 AM PST Sunday.

* IMPACTS...Travel could be very difficult. Gusty winds could 
  bring down tree branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

For the latest road conditions in Washington state, call 5 1 1.

&&

$$

http://www.weather.gov/seattle

746 
WWUS46 KSEW 111244
WSWSEW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
444 AM PST Sat Dec 11 2021

WAZ513-567>569-112045-
/O.CON.KSEW.WS.W.0015.000000T0000Z-211212T1200Z/
Olympics-Cascades of Whatcom and Skagit Counties-
Cascades of Snohomish and King Counties-
Cascades of Pierce and Lewis Counties-
including Hurricane Ridge, Newhalem, Stevens Pass, 
Snoqualmie Pass, Paradise, and Longmire
444 AM PST Sat Dec 11 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST SUNDAY
ABOVE 3000 FEET...

* WHAT...Heavy snow continued above 3000 feet this morning, then
  above 2000 feet tonight. Total snow accumulations of 18 to 36
  inches.

* WHERE...Cascade mountains of Whatcom and Skagit Counties,
  including the Mount Baker Ski Area, Olympic mountains including
  Hurricane Ridge, Cascade mountains of Pierce and Lewis Counties,
  including the Crystal Mountain Ski Area, Paradise on Mount
  Rainier, Cascade mountains of Snohomish and King Counties,
  including Stevens Pass and Snoqualmie Pass.

* WHEN...Until 4 AM PST Sunday.

* IMPACTS...Travel could be very difficult. Gusty winds could 
  bring down tree branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

For the latest road conditions in Washington state, call 5 1 1.

&&

$$

http://www.weather.gov/seattle

353 
WWUS46 KSEW 112037
WSWSEW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
1237 PM PST Sat Dec 11 2021

WAZ513-567>569-120500-
/O.CON.KSEW.WS.W.0015.000000T0000Z-211212T1200Z/
Olympics-Cascades of Whatcom and Skagit Counties-
Cascades of Snohomish and King Counties-
Cascades of Pierce and Lewis Counties-
including Hurricane Ridge, Newhalem, Stevens Pass, 
Snoqualmie Pass, Paradise, and Longmire
1237 PM PST Sat Dec 11 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST SUNDAY
ABOVE 2000 FEET...

* WHAT...Heavy snow to continue above 2000 feet. Additional snow 
  accumulations of 12 to 15 inches possible.

* WHERE...Cascade mountains of Whatcom and Skagit Counties,
  including the Mount Baker Ski Area, Olympic mountains including
  Hurricane Ridge, Cascade mountains of Pierce and Lewis Counties,
  including the Crystal Mountain Ski Area, Paradise on Mount
  Rainier, Cascade mountains of Snohomish and King Counties,
  including Stevens Pass and Snoqualmie Pass.

* WHEN...Until 4 AM PST Sunday.

* IMPACTS...Plan on difficult travel conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

For the latest road conditions in Washington state, call 5 1 1.

&&

$$

http://www.weather.gov/seattle

237 
WWUS46 KSEW 120436
WSWSEW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
836 PM PST Sat Dec 11 2021

WAZ513-567>569-121200-
/O.CON.KSEW.WS.W.0015.000000T0000Z-211212T1200Z/
Olympics-Cascades of Whatcom and Skagit Counties-
Cascades of Snohomish and King Counties-
Cascades of Pierce and Lewis Counties-
including Hurricane Ridge, Newhalem, Stevens Pass, 
Snoqualmie Pass, Paradise, and Longmire
836 PM PST Sat Dec 11 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST SUNDAY
ABOVE 2000 FEET...

* WHAT...Heavy snow continued above 2000 feet. Additional snow
  accumulations of 4 to 8 inches.

* WHERE...Cascade mountains of Whatcom and Skagit Counties, 
  including the Mount Baker Ski Area, Olympic mountains 
  including Hurricane Ridge, Cascade mountains of Pierce and 
  Lewis Counties, including the Crystal Mountain Ski Area, 
  Paradise on Mount Rainier, Cascade mountains of Snohomish and 
  King Counties, including Stevens Pass and Snoqualmie Pass.

* WHEN...Until 4 AM PST Sunday.

* IMPACTS...Plan on slippery road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

For the latest road conditions in Washington state, call 5 1 1.

&&

$$

http://www.weather.gov/seattle

978 
WWUS46 KSEW 121147
WSWSEW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Seattle WA
347 AM PST Sun Dec 12 2021

WAZ513-567>569-121300-
/O.EXP.KSEW.WS.W.0015.000000T0000Z-211212T1200Z/
Olympics-Cascades of Whatcom and Skagit Counties-
Cascades of Snohomish and King Counties-
Cascades of Pierce and Lewis Counties-
including Hurricane Ridge, Newhalem, Stevens Pass, 
Snoqualmie Pass, Paradise, and Longmire
347 AM PST Sun Dec 12 2021

...WINTER STORM WARNING WILL EXPIRE AT 4 AM PST EARLY THIS
MORNING ABOVE 2000 FEET...

The heaviest snowfall has ended, so the winter storm warning will
be allowed to expire at 4 AM. Widespread snow showers will
continue today, however, with an additional 3 to 7 inches 
expected above 2000 feet through tonight.

$$

http://www.weather.gov/seattle

The office that day

Everything else NWS Seattle, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 10, 2:36 AM PST	Small Craft Advisory	SEW		12 hr
Dec 10, 4:07 AM PST	High Wind Warning	SEW	San Juan	28 hr
Dec 10, 7:18 AM PST	Flood Watch	SEW	Lewis, Mason	32 hr

Nearby

Winter Storm Warnings in Washington, 2021 Every winter storm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.