Alaska, 2021

Blizzard and Winter Storm in Alaska, December 4 to 8, 2021

December 4 to 8, 2021 · NWS AFG · 14 events in 13 counties and zones

A very strong low pressure system moved north through the Bering Sea and across the Chukotsk Peninsula and Bering Strait December 4th through the 6th. The central pressure of the low dropped to 949 millibars as it moved across the eastern Chukotsk Peninsula the afternoon of December 5th and then weakened as it continued to track north into the Chukchi Sea.

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
14

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS AFG wrote it up.

A very strong low pressure system moved north through the Bering Sea and across the Chukotsk Peninsula and Bering Strait December 4th through the 6th. The central pressure of the low dropped to 949 millibars as it moved across the eastern Chukotsk Peninsula the afternoon of December 5th and then weakened as it continued to track north into the Chukchi Sea. A strong weather front associated with this system swept across the West Coast, Interior, and the North Slope of Alaska. This resulted in heavy snow, strong winds, blizzard conditions, and minor coastal flooding at some locations along the Bering Sea coast.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Fairbanks, AK wrote its last area forecast discussion before the first event at Dec 4, 6:38 AM AKST, 8 minutes earlier.

Area forecast discussion, Dec 4, 6:38 AM AKST, 8 minutes before
Northern Alaska Forecast Discussion
National Weather Service Fairbanks AK
638 AM AKST Sat Dec 4 2021

.SYNOPSIS...
Strong high pressure is causing clear skies and temperatures in
the 30s and 40s below across the Eastern Interior that will become
less severe Sat night and Sun as clouds approach from the west.

A weather front that lies along the West Coast of Alaska will lift
north and weaken this morning. Strong winds and blizzard or near
blizzard conditions occuring with this front along the West Coast
will diminish early this morning as the front lifts north and
weakens.

A low just west of Shemya, which contains the remnants of a
tropical storm, will deepen very rapidly as it moves into the
Bering Sea today and taps into very cold arctic air off of Russia.
This will bring southerly gale and storm force winds, along with
heavy snow and blizzard conditions, to St Lawrence Island this
evening, then spreading to the remainder of the West Coast late
tonight and Sun. Heavy snow and localized blizzard conditions
will spread into the Western Interior on Sun. Expect 8 to 18
inches of snow across the West Coast and Western Interior by the
time the storm tapers off on Mon. This will also bring strong
winds and cold winds chills to the Brooks Range, Alaska Range, and
Eastern Interior tonight through Mon.

The strong south winds over the Bering Sea today and tonight, will
become southwest on Sun and remain southwest into Mon. This will
cause sharp rises in sea levels along the West Coast of Alaska
from the Bering Strait south starting early Sunday, and will
bring the possibility of coastal flooding. Sea levels could rise
4 to 6 feet above normal along the West Coast from the Bering
Strait south, which could flood low lying areas along the coast
and cause ice to pile up on the beach. Although there is extensive
sea ice in this area, the ice is highly fractured and will likely
only partially dampen the storm surge, and could pile up on the
beach. People along the coast from the Being Strait south should
move boats and valuables away from the shore to prevent damage
from sea ice and minor flooding. This should be done today, before
the next blizzard hits.

Surface...
A strong weather front along the West Coast of Alaska will weaken
and move east today. A low just west of Shemya will move to the
Western Bering Sea as a 966 MB low by 3pm Sat, to 150 NM west of
Gambell as a 956 mb low by 3pm Sun, and to near Cape Lisburne as a
975 mb low by 3pm Mon.

&&

.DISCUSSION...
At 00Z, Models initialize well aloft. Models show similar
solutions aloft through Mon. With precipitation, models show
similar solutions with location and amounts of precip through 3pm
Sun. For Sun night and Mon the GFS/ECMF maintain similar areal
coverage and amounts, while the NAM starts to diverge. Favor the
consistency of the GFS/ECMF precip for Sat night and Sun.

At the surface at 06Z, models all verify well most features, but
the NAM and ECMF are 4-6 mb too weak on the high over the ALCAN
Border, while the GFS and Canadian verify well on that and other
features. All models show similar solutions on the incoming deep
Bering Sea Low through 3pm Sun. After that time models show
similar movement on surface low but the ECMF keeps that low deeper
longer than the NAM and GFS, while the GFS keep the high in the
Yukon stronger than other models. Favor the GFS, but will bump up
winds 3-5 kt Sun night and Mon over the North Slope and NW AK to
account for the GFS weakening the surface low too quickly.

Bottom line for models, is that we will use a blend of the
GFS/NAM/ECMF through 3pm Sun for precip, temps clouds, then use a
blend of the GFS and ECMF for Sun night and Mon for precip/ temps/
clouds. For surface field and winds, will use a blend of the GFS
and Canadian through 3pm Sun, then use the GFS winds for Sun
night and Mon while bumping up winds speeds 3-5 kt over NW AK and
the North Slope.

Coastal Hazard Potential Days 3 and 4...
The strong south winds over the Bering Sea today and tonight, will
become southwest on Sun and remain southwest into Mon. This will
cause sharp rises in sea levels along the West Coast of Alaska
from the Bering Strait south starting early Sunday, and will
bring the possibility of coastal flooding. Sea levels could rise
4 to 6 feet above normal along the West Coast from the Bering
Strait south, which could flood low lying areas along the coast
and cause ice to pile up on the beach. Although there is extensive
sea ice in this area, the ice is highly fractured and will likely
only partially dampen the storm surge, and could pile up on the
beach. People along the coast from the Being Strait south should
move boats and valuables away from the shore to prevent damage
from sea ice and minor flooding. This should be done today, before
the next blizzard hits.

&&

.AFG WATCHES/WARNINGS/ADVISORIES...
Blizzard Warning for AKZ207-AKZ208-AKZ209-AKZ210-AKZ211-AKZ212-
AKZ213-AKZ214.

Winter Storm Watch for AKZ218-AKZ219.

Wind Chill Advisory for AKZ223-AKZ224-AKZ225-AKZ226.

Coastal Flood Watch for AKZ211-AKZ212-AKZ213-AKZ214.

Winter Weather Advisory for AKZ206-AKZ221-AKZ227.

Winter Storm Warning for AKZ215-AKZ216-AKZ217.

Heavy Freezing Spray Warning for PKZ210.

Gale Warning for PKZ215-PKZ220-PKZ225-PKZ230.

Storm Warning for PKZ200-PKZ210.
&&

JB DEC 21

Event by event

7 blizzard, 5 winter storm, 2 high wind. Local standard time, as filed.

Blizzard, Chukchi Sea Coast

When
December 4, 6:46 AM AKST to December 6, 11:03 AM AKST
Where
Chukchi Sea Coast forecast zone
Reported by
ASOS

Blizzard conditions and high winds occurred across the northern Seward Peninsula and the coast from Cape Krusenstern northward. This was the second strong weather system to impact the region the first week of December. The weather station in the village of Kivalina reported a visibility near zero along with very strong winds. Wind gusts from the southeast to 75 mph were observed at Kivalina in the early evening of December 5th but the wind sensor had not been reporting for much of the day so it is possible peak winds were higher. Point Hope reported visibility to one half a mile at times and southeast wind gusts which peaked at 64 mph on the December 5th.

Blizzard, Lower Kobuk & Noatak Valleys

When
December 4, 6:46 AM AKST to December 6, 2:31 PM AKST
Where
Lower Kobuk & Noatak Valleys forecast zone
Reported by
AWOS

Blizzard conditions and high winds occurred across lower Noatak River Valley with near blizzard conditions in the lower Kobuk Valley. The weather station in the village of Noatak reported a visibility near zero along with very strong winds. A peak wind gust from the southeast to 60 mph was observed at Noatak in the morning of December 5th. Red Dog Mine also reported near zero visibility and peak wind gusts to 47 mph on December 5th.

Blizzard, Baldwin Pen. & Selawik Valley

When
December 4, 6:46 AM AKST to December 6, 9:19 AM AKST
Where
Baldwin Pen. & Selawik Valley forecast zone
Reported by
ASOS

Blizzard conditions and high winds occurred across Kotzebue Sound. The weather station at the village of Kotzebue reported a visibility near zero along with very strong winds. Wind gusts peaked from the east to 70 mph during the morning of December 5th with frequent gusts from 60 to 70 mph during the morning hours.

Blizzard, Nrn & Intr. Seward Peninsula

When
December 4, 6:46 AM AKST to December 6, 9:19 AM AKST
Where
Nrn & Intr. Seward Peninsula forecast zone
Reported by
AWOS

Blizzard conditions and high winds occurred across the Seward Peninsula. The weather station at the village of Buckland reported visibility near zero and occasionally below one half mile at Deering. Strong winds were also observed with wind gusts peaking from the southeast to 64 mph in Deering and to 51 mph in Buckland on December 5th.

Blizzard, Srn Seward Peninsula Coast

When
December 4, 6:46 AM AKST to December 6, 5:59 AM AKST
Where
Srn Seward Peninsula Coast forecast zone
Reported by
ASOS

Blizzard conditions and southeast winds gusting from 55 mph to nearly 70 mph occurred across the southern Seward Peninsula. Visibility near zero was observed in Nome, Golovin, and White Mountain. Peak wind gusts reached 58 mph at Nome, 61 mph at Golovin, and 69 mph in White Mountain during the morning hours of December 5th. Businesses and schools were closed across the region due to 5 foot or greater snow drifts and poor visibility. A structure under construction in Golovin had the front paneling ripped off and was flapping in the wind (see image).

Blizzard, St Lawrence Is. Bering Strait

When
December 4, 6:46 AM AKST to December 6, 5:59 AM AKST
Where
St Lawrence Is. Bering Strait forecast zone
Reported by
AWOS

Blizzard conditions and high winds occurred from St. Lawrence Island to the Bering Strait coast. This was the second strong weather system to impact the region the first week of December. The weather stations in the villages of Savoonga, Wales, and Teller all reported a visibility near zero along with very strong winds. Widespread southeast winds gusting from 70 to 80 mph were observed. Peak wind gusts ranged from 98 mph at Tin City, 76 mph at Savoonga, 70 mph at Gambell, and 74 mph at Wales during the late afternoon and evening of December 4th. Power outages were reported at Wales along with significant snowdrifts in the communities.

Blizzard, Yukon Delta

When
December 4, 6:46 AM AKST to December 5, 9:56 PM AKST
Where
Yukon Delta forecast zone
Reported by
AWOS

Blizzard conditions and high winds occurred across the Yukon Delta. This was the second strong weather system to impact the region the first week of December. The weather station in the villages of Scammon Bay and Mountain Village reported a visibility near zero along with very strong winds, while other communities in the region reported near blizzard conditions with visibility one half mile or less at times. Wind gusts peaked during the overnight hours of December 4th from the southeast to 75 mph at Cape Romanzof, 68 mph at Scammon Bay, and 63 mph at Mountain Village.

Winter Storm, Lower Yukon Valley

When
December 4, 6:46 AM AKST to December 6, 9:19 AM AKST
Where
Lower Yukon Valley forecast zone
Reported by
Local Official

Heavy snow, strong winds, and near blizzard conditions impacted the Lower Yukon Valley communities. Officials at the school in Russian Mission reported a storm total of 8 inches of new snow with significant drifting. In Anvik, visibility was one half mile or less at times with southeast wind gusts peaking at 50 mph on December 5th.

Winter Storm, Lower Koyukuk Middle Ykn Vlys

When
December 4, 6:46 AM AKST to December 6, 9:00 PM AKST
Where
Lower Koyukuk Middle Ykn Vlys forecast zone
Reported by
SNOTEL

Heavy snow impacted several of the middle Yukon River Valley communities. The SNOTEL at Galena reported around 13 inches during the event.

Winter Storm, S. Slopes of Ern Brooks Range

When
December 4, 11:52 AM AKST to December 7, 5:52 AM AKST
Where
S. Slopes of Ern Brooks Range forecast zone
Reported by
COOP Observer

Very heavy snow fell along the Brooks Range with the highest amounts from the Dalton Highway westward. The COOP observer in Wiseman reported an incredible storm total of 41.6 inches between 4 PM Sunday December 5th and 4 AM Tuesday December 7th. Another resident in Wiseman observed approximately 37 inches that fell between Sunday evening December 5th and Noon Monday December 6th. Amounts were lighter just to the south with the Coldfoot SNOTEL reporting a storm total of 19 inches for the event.

Winter Storm, Upper Koyukuk Valley

When
December 4, 11:52 AM AKST to December 7, 5:32 AM AKST
Where
Upper Koyukuk Valley forecast zone
Reported by
COOP Observer

Heavy snow impacted several of the Upper Koyukuk River Valley communities. The weather observer in Bettles reported 13.7 inches of snow between Sunday evening December 5th and Monday afternoon December 6th.

High Wind, Denali

When
December 5, 1:13 PM AKST to December 6, 2:40 PM AKST
Where
Denali forecast zone
Measured
68 kt (78 mph) measured gust
Reported by
Department of Highways

Strong southerly Chinook winds were observed through Alaska Range passes. The AKDOT Road Weather Information System observation along the Parks Highway at Antler Creek reported a peak gust of 78 mph during the early afternoon of December 6th.

High Wind, Ne. Slopes of the Ern Ak Rng

When
December 5, 1:13 PM AKST to December 6, 2:40 PM AKST
Where
Ne. Slopes of the Ern Ak Rng forecast zone
Measured
70 kt (81 mph) measured gust
Reported by
Other Federal Agency

Strong southerly Chinook winds were observed through Alaska Range passes. The Ft. Greely Mesonet observation Texas Condo near the Richardson Highway reported occasional gusts to 81 mph between the evening of December 5th and the morning of December 6th.

Winter Storm, Ne. Slopes of the Ern Ak Rng

When
December 6, 10:59 AM AKST to December 8, 2:35 AM AKST
Where
Ne. Slopes of the Ern Ak Rng forecast zone
Reported by
Department of Highways

Heavy snow and strong winds in the Alaska Range resulted in near blizzard conditions. The AKDOT Trims Maintenance Camp on the Richardson Highway reported 11 inches of storm total snowfall, poor visibility in snow and blowing snow, and heavy drifting across the highway. Winds started out as southerly and shifted to northerly in the later half of the event, which impacted different portions of the highway corridor through the Alaska Range.

What these are

Blizzard
Sustained winds or frequent gusts of 35 mph or more with falling or blowing snow that cuts visibility below a quarter mile for three hours or longer.
Winter Storm
A storm that brought snow, sleet or freezing rain at warning levels, usually over several hours or days.
High Wind
Sustained non-thunderstorm winds of 40 mph or more for an hour, or gusts of 58 mph or more.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Alaska in 2021Every state in 2021This day in weather historyWarnings in Alaska, December 2021

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1000792, 1000793, 1000794, 1000795, 1000796, 1000797, 1000955, 1000967, 1000990, 1000998, 1001003, 1001021, 1001022, 1001023.