A powerful storm system tracking across the Upper Great Lakes produced storm force winds across much of Lake Superior on the 16th.

Marine High Wind in SAXON HARBOR WI TO UPPER ENTRANCE OF PORTAGE CANAL MI 5NM OFFSHORE TO US/CANADIAN BORDER INC ISLE ROYAL NP, LAKE SUPERIOR
From 16-DEC-21 01:15:00 to 16-DEC-21 01:30:00 (EST-5)
Location: ROCK OF AGES LIGHT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Rock of Ages Light measured a peak southeast storm force gust of 67 mph at 121 EST on the 16th.

Marine High Wind in GRAND MARAIS TO WHITEFISH POINT MI, LAKE SUPERIOR
From 16-DEC-21 16:45:00 to 16-DEC-21 18:10:00 (EST-5)
Location: GRAND MARAIS LIGHT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Grand Marais GLOS station measured storm force west wind gusts through the period with a peak gust of 61 mph at 450 pm EST on the 16th.

Marine High Wind in MANITOU ISLAND TO MARQUETTE MI AND W OF GRAND MARAIS MI TO US/CANADIAN BORDER BEYOND 5NM OF SHORE, LAKE SUPERIOR
From 16-DEC-21 06:00:00 to 16-DEC-21 06:10:00 (EST-5)
Location: MARQUETTE
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mariner

The Edgar B. Speer reported a peak gust of 53 knots approximately 11 miles north of Shot Point.

Marine High Wind in UPPER ENTRANCE OF PORTAGE CANAL TO MANITOU ISLAND MI 5NM OFFSHORE TO US/CANADIAN BORDER, LAKE SUPERIOR
From 16-DEC-21 10:30:00 to 16-DEC-21 19:00:00 (EST-5)
Location: PASSAGE ISLAND LIGHT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Storm force wind gusts were recorded throughout the period with a peak west wind gust of 60 mph at 658 pm EST on the 16th.

Marine High Wind in ONTONAGON TO UPPER ENTRANCE OF PORTAGE CANAL MI, LAKE SUPERIOR
From 16-DEC-21 08:20:00 to 16-DEC-21 08:30:00 (EST-5)
Location: BEACON HILL
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Peak wind gust of 58 mph reported by spotter at Freda.

Marine High Wind in MANITOU ISLAND TO MARQUETTE MI AND W OF GRAND MARAIS MI TO US/CANADIAN BORDER BEYOND 5NM OF SHORE, LAKE SUPERIOR
From 16-DEC-21 06:20:00 to 17-DEC-21 03:00:00 (EST-5)
Location: STANNARD ROCK LIGHT
Magnitude: 67.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Storm force west to southwest winds were recorded throughout much of the period at the Stannard Rock C-MAN station.  A peak storm force west wind gust of 77 mph was measured at 535 pm EST on the 16th.

Marine High Wind in MUNISING TO GRAND MARAIS MI, LAKE SUPERIOR
From 16-DEC-21 03:20:00 to 16-DEC-21 05:50:00 (EST-5)
Location: GRAND MARAIS LIGHT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Grand Marais GLOS station measured storm force south wind gusts through the period with a peak gust of 58 mph at 410 am EST on the 16th.

Marine High Wind in GRAND MARAIS TO WHITEFISH POINT MI, LAKE SUPERIOR
From 16-DEC-21 03:20:00 to 16-DEC-21 05:50:00 (EST-5)
Location: GRAND MARAIS LIGHT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Grand Marais GLOS station measured storm force south wind gusts through the period with a peak gust of 58 mph at 410 am EST on the 16th.

Marine High Wind in MUNISING TO GRAND MARAIS MI, LAKE SUPERIOR
From 16-DEC-21 16:45:00 to 16-DEC-21 18:10:00 (EST-5)
Location: GRAND MARAIS LIGHT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Grand Marais GLOS station measured storm force west wind gusts through the period with a peak gust of 61 mph at 450 pm EST on the 16th.