A cold front moving through the area generated strong thunderstorms over portions of Lake Superior on the evening of the 15th.

Marine Thunderstorm Wind in POINT ISABELLE TO LOWER ENTRANCE OF PORTAGE CANAL MI, LAKE SUPERIOR
From 15-JUL-19 19:09:00 to 15-JUL-19 19:14:00 (EST-5)
Location: KEWEENAW LOWER ENTRANCE LIGHT
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Measured thunderstorm wind gust at buoy 45025 in Keweenaw Bay.

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 15-JUL-19 19:09:00 to 15-JUL-19 19:14:00 (EST-5)
Location: KEWEENAW LOWER ENTRANCE LIGHT
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Measured thunderstorm wind gust at buoy 45025 in Keweenaw Bay.

Marine Thunderstorm Wind in MANITOU ISLAND TO MARQUETTE MI BEYOND 5NM FROM SHORE, LAKE SUPERIOR
From 15-JUL-19 20:10:00 to 15-JUL-19 20:15:00 (EST-5)
Location: MARQUETTE
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Peak thunderstorm wind gust observed at the Granite Island Light observing station.

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 15-JUL-19 18:24:00 to 15-JUL-19 18:29:00 (EST-5)
Location: PASSAGE ISLAND LIGHT
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Ojibway RAWS station on Isle Royale measured a peak thunderstorm wind gust of 47 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 15-JUL-19 17:20:00 to 15-JUL-19 17:25:00 (EST-5)
Location: ROCK OF AGES LIGHT
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Measured thunderstorm wind gust at Rock of Ages Light observing station.

Marine Thunderstorm Wind in UPPER ENTRANCE OF PORTAGE CANAL TO EAGLE RIVER MI, LAKE SUPERIOR
From 15-JUL-19 18:29:00 to 15-JUL-19 18:34:00 (EST-5)
Location: KEWEENAW UPPER ENTRY LIGHT
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Buoy 45023 near the Upper Entrance of Portage Canal measured a thunderstorm wind gust of 40 mph.

Marine Thunderstorm Wind in UPPER ENTRANCE OF PORTAGE CANAL TO MANITOU ISLAND MI 5NM OFFSHORE TO US/CANADIAN BORDER, LAKE SUPERIOR
From 15-JUL-19 18:40:00 to 15-JUL-19 18:45:00 (EST-5)
Location: PASSAGE ISLAND LIGHT
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Buoy 45001 over northern Lake Superior measured a thunderstorm wind gust of 42 mph on the evening of the 15th.

Marine Thunderstorm Wind in EAGLE RIVER TO MANITOU ISLAND MI, LAKE SUPERIOR
From 15-JUL-19 18:42:00 to 15-JUL-19 18:47:00 (EST-5)
Location: COPPER HARBOR
Magnitude: 34.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Copper Harbor ASOS measured a thunderstorm wind gust of 39 mph on the evening of the 15th.

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 15-JUL-19 18:10:00 to 15-JUL-19 18:15:00 (EST-5)
Location: ROCK OF AGES LIGHT
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

The western Lake Superior buoy 45006 measured a thunderstorm wind gust of 45 mph on the evening of the 15th.

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 15-JUL-19 19:36:00 to 15-JUL-19 19:41:00 (EST-5)
Location: STANNARD ROCK LIGHT
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

The Stannard Rock Light station measured a thunderstorm wind gust of 51 mph on the evening of the 15th.

Marine Thunderstorm Wind in MANITOU ISLAND TO MARQUETTE MI BEYOND 5NM FROM SHORE, LAKE SUPERIOR
From 15-JUL-19 20:10:00 to 15-JUL-19 20:15:00 (EST-5)
Location: MARQUETTE
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Granite Island Light observing station measured a thunderstorm wind gust of 51 mph on the evening of the 15th.

Marine Thunderstorm Wind in HURON ISLANDS TO MARQUETTE MI, LAKE SUPERIOR
From 15-JUL-19 20:10:00 to 15-JUL-19 20:15:00 (EST-5)
Location: GRANITE ISLAND LIGHT
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Granite Island Light observing station measured a thunderstorm wind gust of 51 mph on the evening of the 15th.