Strong to severe thunderstorms moved across Lake Superior during the evening of the 27th.

Marine Thunderstorm Wind in SAXON HARBOR WI TO BLACK RIVER MI, LAKE SUPERIOR
From 27-AUG-18 17:40:00 to 27-AUG-18 17:45:00 (EST-5)
Location: SAXON HARBOR WI
Magnitude: 34.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

There was a 34-knot peak thunderstorm wind gust at the Saxon Harbor GLOS site.

Marine Thunderstorm Wind in UPPER ENTRANCE OF PORTAGE CANAL TO EAGLE RIVER MI, LAKE SUPERIOR
From 27-AUG-18 19:30:00 to 27-AUG-18 19:35:00 (EST-5)
Location: KEWEENAW UPPER ENTRY LIGHT
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

The buoy north of the Upper Entrance to Portage Canal measured a peak thunderstorm wind gust of 49 mph.

Marine Thunderstorm Wind in UPPER ENTRANCE OF PORTAGE CANAL TO EAGLE RIVER MI, LAKE SUPERIOR
From 27-AUG-18 19:23:00 to 27-AUG-18 19:40:00 (EST-5)
Location: MCCLAIN STATE PARK
Magnitude: 42.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Portage Canal GLOS site measured thunderstorm wind gusts between 43 and 48 mph through the period.

Marine Thunderstorm Wind in EAGLE RIVER TO MANITOU ISLAND MI, LAKE SUPERIOR
From 27-AUG-18 19:20:00 to 27-AUG-18 19:25:00 (EST-5)
Location: COPPER HARBOR
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Copper Harbor ASOS measured a thunderstorm wind gust of 40 mph.

Marine Thunderstorm Wind in PORTAGE LAKE TO HURON IS MI TO LOWER ENTRANCE OF PORTAGE CANAL TO HURON IS INC KEWEENAW AND HURON BAYS, LAKE SUPERIOR
From 27-AUG-18 19:40:00 to 27-AUG-18 19:45:00 (EST-5)
Location: KEWEENAW LOWER ENTRANCE LIGHT
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

The buoy south of the Lower Entrance to Portage Canal measured a thunderstorm wind gust of 40 mph.

Marine Thunderstorm Wind in POINT ISABELLE TO LOWER ENTRANCE OF PORTAGE CANAL MI, LAKE SUPERIOR
From 27-AUG-18 19:50:00 to 27-AUG-18 20:00:00 (EST-5)
Location: TRAVERSE BAY
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Grand Traverse Bay GLOS station measured a peak thunderstorm wind gust of 49 mph.

Marine Thunderstorm Wind in MANITOU ISLAND TO MARQUETTE MI BEYOND 5NM FROM SHORE, LAKE SUPERIOR
From 27-AUG-18 21:00:00 to 27-AUG-18 21:05:00 (EST-5)
Location: MARQUETTE
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Granite Island Light GLOS measured a thunderstorm wind gust of 41 mph.

Marine Thunderstorm Wind in HURON ISLANDS TO MARQUETTE MI, LAKE SUPERIOR
From 27-AUG-18 21:00:00 to 27-AUG-18 21:05:00 (EST-5)
Location: GRANITE ISLAND LIGHT
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Granite Island Light GLOS measured a thunderstorm wind gust of 41 mph.

Marine Thunderstorm Wind in MANITOU ISLAND TO MARQUETTE MI AND W OF GRAND MARAIS MI TO US/CANADIAN BORDER BEYOND 5NM OF SHORE, LAKE SUPERIOR
From 27-AUG-18 20:49:00 to 27-AUG-18 20:54:00 (EST-5)
Location: STANNARD ROCK LIGHT
Magnitude: 49.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

The Stannard Rock Light C-MAN station measured a peak thunderstorm wind gust of 56 mph.

Marine Thunderstorm Wind in UPPER ENTRANCE OF PORTAGE CANAL TO MANITOU ISLAND MI 5NM OFFSHORE TO US/CANADIAN BORDER, LAKE SUPERIOR
From 27-AUG-18 21:14:00 to 27-AUG-18 21:19:00 (EST-5)
Location: PASSAGE ISLAND LIGHT
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

The Passage Island Light C-MAN station measured a thunderstorm wind gust of 49 mph.

Marine Thunderstorm 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 27-AUG-18 21:06:00 to 27-AUG-18 21:11:00 (EST-5)
Location: ROCK OF AGES LIGHT
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

The Rock of Ages Light C-MAN station measured a thunderstorm wind gust of 43 mph.

Marine Thunderstorm Wind in MANITOU ISLAND TO MARQUETTE MI AND W OF GRAND MARAIS MI TO US/CANADIAN BORDER BEYOND 5NM OF SHORE, LAKE SUPERIOR
From 27-AUG-18 21:35:00 to 27-AUG-18 21:40:00 (EST-5)
Location: STANNARD ROCK LIGHT
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

The eastern Lake Superior buoy 45004 measured a peak thunderstorm wind gust of 69 mph.

Marine Thunderstorm Wind in MANITOU ISLAND TO MARQUETTE MI AND W OF GRAND MARAIS MI TO US/CANADIAN BORDER BEYOND 5NM OF SHORE, LAKE SUPERIOR
From 27-AUG-18 21:11:00 to 27-AUG-18 21:16:00 (EST-5)
Location: STANNARD ROCK LIGHT
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

The Stannard Rock Light measured a thunderstorm wind gust of 45 mph.

Marine Thunderstorm Wind in MANITOU ISLAND TO MARQUETTE MI AND W OF GRAND MARAIS MI TO US/CANADIAN BORDER BEYOND 5NM OF SHORE, LAKE SUPERIOR
From 27-AUG-18 22:08:00 to 27-AUG-18 22:13:00 (EST-5)
Location: STANNARD ROCK LIGHT
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

The Stannard Rock Light measured a thunderstorm wind gust of 40 mph.

Marine Thunderstorm Wind in MUNISING TO GRAND MARAIS MI, LAKE SUPERIOR
From 27-AUG-18 23:10:00 to 27-AUG-18 23:15:00 (EST-5)
Location: GRAND MARAIS LIGHT
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The GLOS station at Grand Marais measured a 40-knot thunderstorm wind gust.

Marine Thunderstorm Wind in GRAND MARAIS TO WHITEFISH POINT MI, LAKE SUPERIOR
From 27-AUG-18 23:10:00 to 27-AUG-18 23:15:00 (EST-5)
Location: GRAND MARAIS LIGHT
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The GLOS station at Grand Marais measured a 40-knot thunderstorm wind gust.