A north to south oriented frontal boundary brought periods of heavy snow, avalanche conditions, lowered visibilities, high winds and strong surf from west to east over the course of several days as the front shifted slowly east and developed into a triple point low over the western Gulf. Strong upper level dynamics and a deep moisture fetch made this an impactful storm for southern Alaska.

Winter Storm in KUSKOKWIM DELTA, ALASKA
From 04-DEC-21 05:00:00 to 05-DEC-21 16:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Bethel PD reported about 12 inches of snow. Hooper Bay PD reported 10-14 inches. Kipnuk PD reported only a little snow. Quinhagak PD reported 2-4 inches.

Winter Storm in SUSITNA VALLEY, ALASKA
From 04-DEC-21 05:17:00 to 07-DEC-21 05:13:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Reported observations of 19 inches at Eagle Song, 19 inches at Skwentna, 14 inches at Yentna, and 15.5 inches at Amber Lake.

Heavy Snow in NERN P.W. SND, ALASKA
From 04-DEC-21 15:41:00 to 07-DEC-21 18:05:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Upper Tsaina SNOTEL 29.9 inches recorded.

Heavy Snow in WRN P.W. SND & KENAI MTNS, ALASKA
From 04-DEC-21 15:41:00 to 07-DEC-21 05:13:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Turnagain Pass SNOTEL recorded 14.1 inches. A spotter report from Lowell Point noted 8-11 inches of wet snow at 12/6/21 12PM. By 2PM, the road from Lowell Pt to Seward was closed due to an avalanche.

Coastal Flood in KUSKOKWIM DELTA, ALASKA
From 04-DEC-21 16:23:00 to 06-DEC-21 03:02:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Kipnik PD reports flooding in airport overflow areas and one road covered in water.

Winter Weather in LOWER KUSKOKWIM VALLEY, ALASKA
From 06-DEC-21 04:26:00 to 07-DEC-21 01:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

PASL had a 24-hr QPF of 0.82 from 12/6 00Z to 12/7 00Z, or about 8 inches of snow using a 10:1 ratio.

Winter Weather in ANCHORAGE MUNI TO BIRD CREEK, ALASKA
From 06-DEC-21 04:46:00 to 07-DEC-21 12:59:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Measurements: 1 inch of snow reported at office and 3 inches of snow reported in east Anchorage.
Report from NWS employee on 12/7: I left downtown about 3:50pm.  Snowfall gradually increased with outright +SN at the Hiland exit on the Glenn Highway.  Quite possibly approaching 8-12 of new snow in that area.  Except for one section near the weigh station the snow was being blown in between the lanes and wasn't accumulating in the driving lanes. The snow rates decreased quickly in the first few miles up Hiland Road.  It was clear this was a persistent feature as there was much less new snow in this area.  Snowfall increased rapidly again past mile 5 of Hiland with moderate snow towards the end. So far I've had 8.5 new snow today with significant snow continuing as of 4:50 pm.   2.2 of new snow as of 8 am which was 12:1 ratio.   The 6.3 was very low density fluff.

Winter Storm in KENAI PENINSULA, ALASKA
From 06-DEC-21 13:27:00 to 07-DEC-21 10:03:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Lower Kachemak Creek SNOTEL recorded 17.6 inches and the McNeil Canyon SNOTEL recorded 9.2 inches. A trained spotter reported 13 of new snow overnight the 6th around 12 PM.

Winter Weather in KUSKOKWIM DELTA, ALASKA
From 06-DEC-21 15:18:00 to 08-DEC-21 12:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Blowing snow leading to half mile visibility at PALG and 3/4SM at several other neighboring airport ASOS.

Heavy Snow in WRN P.W. SND & KENAI MTNS, ALASKA
From 08-DEC-21 16:17:00 to 10-DEC-21 06:53:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Exit Glacier SNOTEL recorded 14.0 inches. Received reports from spotter Karen Corrigan at 4PM on 12/9 of 9 inches and Dave (300 ft above Lowell Point) estimated 11 inches of snow between sunrise on 12/9 to 12/10 around 1 AM. At Moose Pass Railroad 9.6 inches were noted on 12/10 at 10:00AM.

Winter Weather in KENAI PENINSULA, ALASKA
From 08-DEC-21 16:17:00 to 10-DEC-21 12:23:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dennis Anderson (Homer, 12/9 7:15PM) estimated 6-8 in of wet/heavy snow with a foot in some places due to drifting & occasional whiteout conditions. Greg Arnold (Homer, 12/9 7:15PM) reported intermittent wet snow with an estimate of about 6 inches since the day before. Many reported deteriorated road conditions over Facebook along Cooper Landing.

Blizzard in PRIBILOF ISLANDS, ALASKA
From 07-DEC-21 04:39:00 to 09-DEC-21 04:00:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

PASN recorded: 30G36mph 1/4SM +SN FZFG VV006 at 12/8 10:20PM, while webcams showed whiteout conditions. PASN recorded 1/4 mile on numerous occasions as webcams showed whiteout conditions most of  the night. PASN first went down to 1/2SM 36G58 mph SN on 12/8 at 2:47AM, diminishing to 1/4SM on 12/8 at 10:20PM.

High Wind in EASTERN ALEUTIANS, ALASKA
From 07-DEC-21 21:13:00 to 09-DEC-21 08:45:00 (AKST-9)
Magnitude: 91.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Nikolski recorded a peak wind at 52G105 mph on 12/9 at 2:02AM. The UNLA2 site in Unalaks recorded 79MPH 12/9 at 412AM. The Dutch Harbor APL crane recorded a 1s gust of 96 mph on 12/9/2021 at 2:07AM. The Dutch Harbor Pilot Station recorded 1s gust of 80 mph on 12/9/2021 at 2:12AM.  Nikolski first reached warning criteria 12/8 at 5:42PM at 52G75mph.

Coastal Flood in BRISTOL BAY, ALASKA
From 08-DEC-21 12:34:00 to 09-DEC-21 21:01:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Local Official

Water over an Access Road near the harbor in Dillingham on Thu evening. (12/9)
Called Mitch (Port officer in Naknek) -- he said there were no known impacts, however in his 18 years of working there, he has never seen the water that high at the dock in Naknek...at high tide during the event, the water level rose to 1 foot below the dock. Mitch also mentioned precipitation went from SN to RA back to SN. He estimates he walked through about 2 ft drifts, but thinks actual snowfall was closer to 1 foot during this event. He also mentioned it was very windy.

Blizzard in KUSKOKWIM DELTA, ALASKA
From 08-DEC-21 13:12:00 to 09-DEC-21 21:01:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Quinhagak and Kipnuk airports recorded visibilities of 1/2SM or less for a 3 hour period as  winds gusted to 40 mph.

Blizzard in BRISTOL BAY, ALASKA
From 08-DEC-21 13:12:00 to 10-DEC-21 06:31:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Koliganek recorded winds of 39G52 mph and heavy snow with 1/4 sm visibility. Platinum and Cape Newenham airports reported frequent low visibilities of 1/2SM or less with winds to 35-53 mph in combination with moderate to heavy snow for a span of 12 hours. Similar conditions were recorded at Dillingham. Due to these conditions, power was knocked out, trees were toppled and phone service was cut off for about a week:https://www.kdlg.org/energy/2021-12-13/power-restored-to-nushagak-cooperatives-service-area-after-nearly-a-week-of-repairs.

High Wind in ALASKA PENINSULA, ALASKA
From 07-DEC-21 21:13:00 to 09-DEC-21 15:32:00 (AKST-9)
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cold Bay recorded winds at 56G76 mph and Nelson Lagoon recorded west winds at 62G78 mph.