A bitter cold Arctic air mass and periodic upper disturbances moving over the Upper Great Lakes region resulted in moderate to heavy snowfall over the west to northwest wind snow belts of Lake Superior from the 23rd into the 27th.  Much below normal temperatures and bitter cold wind chills were also reported throughout much of the period.

Winter Weather in BARAGA, MICHIGAN
From 25-DEC-17 03:00:00 to 25-DEC-17 20:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

There was a report of 7.5 inches of lake effect snow in 17 hours near Keweenaw Bay.

Winter Weather in GOGEBIC, MICHIGAN
From 24-DEC-17 16:00:00 to 24-DEC-17 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

There was a report of six inches of very fluffy lake effect snow in five hours at Bessemer.

Winter Weather in LUCE, MICHIGAN
From 25-DEC-17 00:00:00 to 25-DEC-17 22:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

There was an estimated eight inches of lake effect snow in less than 24 hours four miles north of Newberry.

Lake-Effect Snow in NORTHERN HOUGHTON, MICHIGAN
From 24-DEC-17 11:00:00 to 25-DEC-17 20:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The observer at Redridge measured 12 inches of lake effect snow in 24 hours. There were public reports of 11 inches of snow in 12 hours at Houghton and an estimated 14 inches of snow in 24 hours five miles south of Hubbell. West winds gusting near 35 mph contributed to whiteout conditions and considerable drifting of snow over portions of the county.

Winter Weather in ALGER, MICHIGAN
From 26-DEC-17 07:00:00 to 27-DEC-17 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The observer ten miles south of Grand Marais measured ten inches of lake effect snow in 24 hours.

Winter Weather in NORTHERN HOUGHTON, MICHIGAN
From 26-DEC-17 08:00:00 to 27-DEC-17 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The observer at Painesdale measured 7.6 inches of lake effect snow in 24 hours.

Extreme Cold/Wind Chill in IRON, MICHIGAN
From 26-DEC-17 12:00:00 to 27-DEC-17 12:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Observers in Amasa and Stambaugh recorded minimum temperatures near 30 below zero during this period.

Lake-Effect Snow in NORTHERN SCHOOLCRAFT, MICHIGAN
From 25-DEC-17 07:00:00 to 26-DEC-17 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Based on nearby cooperative reports,  there was an estimated 12 inches of lake effect snow in 24 hours over the far northeastern portion of Schoolcraft County.

Lake-Effect Snow in ONTONAGON, MICHIGAN
From 23-DEC-17 23:00:00 to 27-DEC-17 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Park rangers at the Porcupine Mountains Wilderness State Park estimated from four to six feet of lake effect snow fell over the higher terrain areas of the park from late on the 23rd through the early morning hours of the 27th.  At lower elevations of the park, including the park headquarters and estimated three to five feet of snow fell.  Park rangers were stuck numerous times in deeper than waist deep snow, even when traveling on snowmobiles.  The duration of the snow event was approximately 72 hours.
Periods of moderate to heavy snow were also reported at White Pine and Ontonagon from the 24th into the 27th along with bitter cold wind chills to 35 below zero on the 26th.

Lake-Effect Snow in ALGER, MICHIGAN
From 25-DEC-17 07:00:00 to 26-DEC-17 12:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The observer ten miles south of Grand Marais measured 12 inches of lake effect snow in 24 hours.  There was also an estimated 12 inches of lake effect snow in 12 hours nine miles south-southeast of Au sable Point on the morning of the 26th.