A low pressure system moving northward from the North Pacific met up with Arctic cold entrenched over southern Alaska. As a result, moisture from the Gulf spread inland and met up with the Arctic air in place leading to a myriad of winter weather precipitation types. Snow, sleet, and freezing rain and blowing snow would all be observed.

Winter Storm in MATANUSKA VALLEY, ALASKA
From 28-DEC-21 04:29:00 to 28-DEC-21 20:46:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

AWOS observation located at the Parks Highway at Hawk Lane MP53 (HKLA2) reported unknown precipitation and a road temperature of 30-31��F with an air temperature of 33-34��F beginning at 7:10 and continued through 8:10 on the 28th of December.
The Alaska 511 webpage at 5:30 PM on the 28th on the Glenn Highway between MP 29-66 recorded difficult road conditions, ice build-up, ice glaze, as well as wet, and icy roads.

Winter Storm in ANCHORAGE MUNI TO BIRD CREEK, ALASKA
From 28-DEC-21 04:29:00 to 28-DEC-21 20:46:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Ted Stevens International Airport ASOS station recorded light freezing rain beginning at 2:11 PM on the 28th of December and continued through 2:53 PM on the 28th.  A trace of ice was recorded.
Another ASOS station in Birchwood reported light snow beginning at 2:38 PM which then changed to sleet or unknown precipitation at 2:56 PM and continued through 8:05 PM on the 28th. Precipitation then switched to rain and then unknown precipitation for a few minutes through 8:35PM on the 28th.
Spotter called the office and mentioned freezing rain in downtown around the same time observed at the office (could hear it on the roof). Another spotter called the office to report that Big Lake had 0.10 inches of ice accumulation and no snow.

Winter Storm in KENAI PENINSULA, ALASKA
From 28-DEC-21 13:04:00 to 28-DEC-21 20:46:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Issued due to a report from an NWS Employee of freezing rain in Kenai. They also said roads were bad, rain was full droplets, and 22 degree air temp.
A spotter called the office and reported solid rain from Kenai to Soldotna to Sterling at approximately 4:35PM on the 28th of December with an air temp 31 degrees and very slick roads. They also reported that the Spur Highway was closed about an hour prior and roads seem to also be sanded. Social media reports of rain & slick surfaces.
The Alaska 511 page reported at 2:35 PM on the 28th that all roads between Kenai, Soldotna, Sterling, and Kasilof River were difficult, black ice, frosted surface, ice, ice glaze, icy patches, road surfaces in poor condition, surface water hazard, wet and icy roads, and freezing rain. Also, social media reports came in of a large power outage effecting many on the Central Peninsula. Social media reports came in that Homer Electric Association was responding to a large power outage effecting over 4,000 members across the Kenai Peninsula and attached the article to the tweet.

Winter Storm in KUSKOKWIM DELTA, ALASKA
From 29-DEC-21 15:24:00 to 30-DEC-21 13:03:00 (AKST-9)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Toksook Bay ASOS observations reported snow and freezing fog with northeast winds of 26 mph with gusts to 33 mph and visibility of one half mile.
At the peak of the event, Toksook Bay ASOS reported snow and freezing fog with quarter mile visibility with northeast winds of 33 mph and gusts to 44 mph.
Toksook Bay ASOS was down at a half mile or less for 3-5 hours between 11:30 AM and 3 PM on the 29th. Webcams showed bad conditions. ASOS reported quarter mile visibility at 2:27PM on the 29th and was consistently down at a quarter mile or less even zero at times through 6 PM the evening of the 29th. Winds were sustained 35 mph gusting to 42 kts (48 mph).