A slow moving cold front was the focus for strong to severe thunderstorms across Lake Superior during the afternoon and evening of the 18th.

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 18-JUL-13 14:23:00 to 18-JUL-13 14:28:00 (EST-5)
Location: ROCK OF AGES LIGHT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Peak wind gust measured at Rock of Ages Light.

Marine Thunderstorm Wind in UPPER ENTRANCE OF PORTAGE CANAL TO MANITOU ISLAND MI 5NM OFFSHORE TO US/CANADIAN BORDER, LAKE SUPERIOR
From 18-JUL-13 14:28:00 to 18-JUL-13 14:33:00 (EST-5)
Location: PASSAGE ISLAND LIGHT
Magnitude: 47.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Peak wind gust measured at Lake Superior buoy 45001.

Marine Thunderstorm Wind in UPPER ENTRANCE OF PORTAGE CANAL TO MANITOU ISLAND MI 5NM OFFSHORE TO US/CANADIAN BORDER, LAKE SUPERIOR
From 18-JUL-13 14:58:00 to 18-JUL-13 15:02:00 (EST-5)
Location: COPPER HARBOR
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Wind gust measured at the Copper Harbor ASOS.

Marine Thunderstorm Wind in UPPER ENTRANCE OF PORTAGE CANAL TO MANITOU ISLAND MI 5NM OFFSHORE TO US/CANADIAN BORDER, LAKE SUPERIOR
From 18-JUL-13 15:13:00 to 18-JUL-13 15:18:00 (EST-5)
Location: PASSAGE ISLAND LIGHT
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Measured wind gust at Lake Superior buoy 45001.

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 18-JUL-13 15:40:00 to 18-JUL-13 15:45:00 (EST-5)
Location: STANNARD ROCK LIGHT
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Measured wind gust at Stannard Rock Light.

Marine Thunderstorm Wind in MANITOU ISLAND TO MARQUETTE MI BEYOND 5NM FROM SHORE, LAKE SUPERIOR
From 18-JUL-13 15:50:00 to 18-JUL-13 15:55:00 (EST-5)
Location: MARQUETTE
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured wind gust at Granite Island Light.

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 18-JUL-13 17:41:00 to 18-JUL-13 17:46:00 (EST-5)
Location: L'ANSE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous trees and power poles knocked down throughout L'anse.

Marine Thunderstorm Wind in ONTONAGON TO UPPER ENTRANCE OF PORTAGE CANAL MI, LAKE SUPERIOR
From 18-JUL-13 21:00:00 to 18-JUL-13 21:05:00 (EST-5)
Location: KEWEENAW UPR ENT LT
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Measured wind gust at Lake Superior buoy 45023.

Marine Thunderstorm Wind in UPPER ENTRANCE OF PORTAGE CANAL TO EAGLE RIVER MI, LAKE SUPERIOR
From 18-JUL-13 21:00:00 to 18-JUL-13 21:05:00 (EST-5)
Location: KEWEENAW UPPER ENTRY LIGHT
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Measured wind gust at Lake Superior buoy 45023.

Marine Thunderstorm Wind in POINT ISABELLE TO LOWER ENTRANCE OF PORTAGE CANAL MI, LAKE SUPERIOR
From 18-JUL-13 21:20:00 to 18-JUL-13 21:25:00 (EST-5)
Location: KEWEENAW LOWER ENTRANCE LIGHT
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Measured gust at Lake Superior buoy 45025.

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 18-JUL-13 21:20:00 to 18-JUL-13 21:25:00 (EST-5)
Location: KEWEENAW LOWER ENTRANCE LIGHT
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Measured wind gust at Lake Superior buoy 45025.

Marine Thunderstorm Wind in ONTONAGON TO UPPER ENTRANCE OF PORTAGE CANAL MI, LAKE SUPERIOR
From 18-JUL-13 20:47:00 to 18-JUL-13 20:52:00 (EST-5)
Location: BEACON HILL
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A measured wind gust from the spotter at Freda.

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 18-JUL-13 20:43:00 to 18-JUL-13 20:48:00 (EST-5)
Location: STANNARD ROCK LIGHT
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Measured wind gust at Stannard Rock Light.

Marine Thunderstorm Wind in MANITOU ISLAND TO MARQUETTE MI BEYOND 5NM FROM SHORE, LAKE SUPERIOR
From 18-JUL-13 22:30:00 to 18-JUL-13 22:35:00 (EST-5)
Location: MARQUETTE
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured wind gust at Granite Island Light.

Marine Thunderstorm Wind in HURON ISLANDS TO MARQUETTE MI, LAKE SUPERIOR
From 18-JUL-13 22:40:00 to 18-JUL-13 22:45:00 (EST-5)
Location: BIG BAY POINT LIGHT
Magnitude: 42.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured wind gust at the Big Bay Light GLOS station.

Marine Thunderstorm Wind in MARQUETTE TO MUNISING MI, LAKE SUPERIOR
From 18-JUL-13 23:27:00 to 18-JUL-13 23:32:00 (EST-5)
Location: MUNISING
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured wind gust at the Munising ASOS.

Marine Thunderstorm Wind in MUNISING TO GRAND MARAIS MI, LAKE SUPERIOR
From 18-JUL-13 23:27:00 to 18-JUL-13 23:32:00 (EST-5)
Location: GRAND ISLAND HARBOR LIGHT
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured wind gust at the Munising ASOS.

Marine Thunderstorm Wind in GRAND MARAIS TO WHITEFISH POINT MI, LAKE SUPERIOR
From 18-JUL-13 18:35:00 to 18-JUL-13 18:40:00 (EST-5)
Location: MUSKALLONGE LAKE STATE PARK
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous large trees knocked down at Muskallonge State Park causing damage to tents, campers and outbuildings.

Marine Thunderstorm Wind in HURON ISLANDS TO MARQUETTE MI, LAKE SUPERIOR
From 18-JUL-13 22:30:00 to 18-JUL-13 22:35:00 (EST-5)
Location: GRANITE ISLAND LIGHT
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured wind gust at Granite Island Light.

Marine Thunderstorm Wind in GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFFSHORE TO THE US/CANADIAN BORDER, LAKE SUPERIOR
From 18-JUL-13 18:35:00 to 18-JUL-13 18:40:00 (EST-5)
Location: GRAND MARAIS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous large trees knocked down at Muskallonge State Park causing damage to tents, campers and outbuildings.