Lake Superior, 2011Marine Thunderstorm Winds in Lake Superior, September 12, 2011
September 12, 2011 · NWS MQT · 14 events in 11 counties and zones
A powerful cold front produced strong to severe thunderstorms over Lake Superior on the evening of the 12th.
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 14
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
A powerful cold front produced strong to severe thunderstorms over Lake Superior on the evening of the 12th.
Marine Thunderstorm Wind, Ontonagon to Upper Entrance of Portage Canal Mi
- When
- September 12, 6:44 PM EST to 7:04 PM EST
- Where
- Ontonagon to Upper Entrance of Portage Canal Mi forecast zone, 0.43 mi NNW of Beacon Hill
- Measured
- 64 kt (74 mph) measured gust
- Reported by
- Trained Spotter
- Coordinates
- 47.136, -88.824
Wind gusts of greater than 50 mph were reported for 20 minutes by the spotter at Freda. A peak wind gust of 74 mph was measured at 1904 EST. Quarter-sized hail was also reported.
Marine Hail, Ontonagon to Upper Entrance of Portage Canal Mi
- When
- September 12, 6:52 PM EST to 6:57 PM EST
- Where
- Ontonagon to Upper Entrance of Portage Canal Mi forecast zone, 0.4 mi ESE of Ontonagon Light
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 46.877, -89.323
Quarter and dime-sized hail were reported. Thunderstorms wind gusts estimated up to 65 mph also brought down several large branches.
Marine Thunderstorm Wind, Upper Entrance of Portage Canal to Eagle River Mi
- When
- September 12, 7:00 PM EST to 7:05 PM EST
- Where
- Upper Entrance of Portage Canal to Eagle River Mi forecast zone, 3.62 mi NE of McClain State Park
- Measured
- 42 kt (48 mph) measured gust
- Reported by
- Buoy
- Coordinates
- 47.280, -88.550
Wind gusts between 45 and 48 mph were measured at buoy 45023 and the Portage Canal GLOS station.
Marine Thunderstorm Wind, Eagle River to Manitou Island Mi
- When
- September 12, 7:04 PM EST to 7:15 PM EST
- Where
- Eagle River to Manitou Island Mi forecast zone, Copper Harbor
- Measured
- 40 kt (46 mph) measured gust
- Reported by
- ASOS
- Coordinates
- 47.470, -87.900
Wind gusts of 45 mph or greater were measured by the Copper Harbor ASOS.
Marine Thunderstorm Wind, Manitou Island to Point Isabelle Mi
- When
- September 12, 7:04 PM EST to 7:15 PM EST
- Where
- Manitou Island to Point Isabelle Mi forecast zone, 6.52 mi NNE of Bete Grise Light
- Measured
- 40 kt (46 mph) measured gust
- Reported by
- ASOS
- Coordinates
- 47.476, -87.902
Wind gusts of 45 mph or greater were measured by the Copper Harbor ASOS.
Marine Thunderstorm Wind, Point Isabelle to Lower Entrance of Portage Canal Mi
- When
- September 12, 7:20 PM EST to 7:24 PM EST
- Where
- Point Isabelle to Lower Entrance of Portage Canal Mi forecast zone, 0.95 mi SW of Traverse Bay
- Measured
- 42 kt (48 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 47.179, -88.242
Wind gust measured by the Grand Traverse Bay GLOS.
Marine Thunderstorm Wind, Portage Lake to Huron Is Mi to Lower Entrance of Portage Canal to Huron Is Inc Keweenaw and Huron Bays
- When
- September 12, 7:30 PM EST to 7:34 PM EST
- Where
- Portage Lake to Huron Is Mi to Lower Entrance of Portage Canal to Huron Is Inc Keweenaw and Huron Bays forecast zone, 1.7 mi SE of Keweenaw Lower Entrance Light
- Measured
- 36 kt (41 mph) measured gust
- Reported by
- Buoy
- Coordinates
- 46.950, -88.409
Wind gust measured by buoy 45025 in the Keweenaw Bay.
Marine Thunderstorm Wind, Point Isabelle to Lower Entrance of Portage Canal Mi
- When
- September 12, 7:30 PM EST to 7:50 PM EST
- Where
- Point Isabelle to Lower Entrance of Portage Canal Mi forecast zone, 1.7 mi SE of Keweenaw Lower Entrance Light
- Measured
- 36 kt (41 mph) measured gust
- Reported by
- Buoy
- Coordinates
- 46.950, -88.409
Measured wind gusts of 40 mph or greater were recorded over a 20-minute period at buoy 45025 in Keweenaw Bay.
Marine Thunderstorm Wind, Portage Lake to Huron Is Mi to Lower Entrance of Portage Canal to Huron Is Inc Keweenaw and Huron Bays
- When
- September 12, 7:30 PM EST to 7:50 PM EST
- Where
- Portage Lake to Huron Is Mi to Lower Entrance of Portage Canal to Huron Is Inc Keweenaw and Huron Bays forecast zone, 1.7 mi SE of Keweenaw Lower Entrance Light
- Measured
- 36 kt (41 mph) measured gust
- Reported by
- Buoy
- Coordinates
- 46.950, -88.409
Measured wind gusts of 40 mph or greater were recorded over a 20-minute period at buoy 45025 in Keweenaw Bay.
Marine Thunderstorm Wind, Manitou Island to Marquette Mi and W of Grand Marais Mi to Us/Canadian Border Beyond 5nm of Shore
- When
- September 12, 7:57 PM EST to 8:00 PM EST
- Where
- Manitou Island to Marquette Mi and W of Grand Marais Mi to Us/Canadian Border Beyond 5nm of Shore forecast zone, Stannard Rock Light
- Measured
- 46 kt (53 mph) measured gust
- Reported by
- C-MAN Station
- Coordinates
- 47.180, -87.230
Measured wind gust at the Stannard Rock C-Man station.
Marine Thunderstorm Wind, Huron Islands to Marquette Mi
- When
- September 12, 8:10 PM EST to 8:22 PM EST
- Where
- Huron Islands to Marquette Mi forecast zone, 2.46 mi WSW of Big Bay Point Light
- Measured
- 40 kt (46 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 46.830, -87.730
Wind gusts measured by the Big Bay GLOS station.
Marine Thunderstorm Wind, Marquette to Munising Mi
- When
- September 12, 9:35 PM EST to 9:38 PM EST
- Where
- Marquette to Munising Mi forecast zone, 0.72 mi SE of Munising
- Measured
- 36 kt (41 mph) measured gust
- Reported by
- ASOS
- Coordinates
- 46.412, -86.650
Measured wind gust at the Munising ASOS.
Marine Thunderstorm Wind, Munising to Grand Marais Mi
- When
- September 12, 9:35 PM EST to 9:38 PM EST
- Where
- Munising to Grand Marais Mi forecast zone, 3.61 mi SSW of Grand Island Harbor Light
- Measured
- 36 kt (41 mph) measured gust
- Reported by
- ASOS
- Coordinates
- 46.412, -86.650
Measured wind gust at the Munising ASOS.
Marine Thunderstorm Wind, Grand Marais to Whitefish Point Mi
- When
- September 12, 9:40 PM EST to 9:43 PM EST
- Where
- Grand Marais to Whitefish Point Mi forecast zone, 0.11 mi WSW of Grand Marais Light
- Measured
- 35 kt (40 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 46.679, -85.972
Measured wind gust at the Grand Marais GLOS station.
- Marine Hail
- Hail three-quarters of an inch or larger over water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Flash Flooding and Flooding in Puerto Rico, September 12 to 13, 2011$1.4 million · 15 events
- Hail in Arizona, September 12, 2011$150,000 · 1.5 in hail · 6 events
- Dust Storm and Hail in Arizona, September 12, 2011$32,000 · 60 kt wind · 3 events
- Excessive Heat in Arkansas, September 12 to 14, 20119 events
- Hail and Damaging Wind in Wisconsin, September 12, 20111.5 in hail · 9 events
- Hail and Damaging Winds in Michigan, September 12, 2011$1,000 · 1.75 in hail · 7 events
- Hail in Minnesota, September 12, 20111 in hail · 5 events
- Hail and Damaging Wind in Florida, September 12, 201152 kt wind · 3 events
- Hail in South Carolina, September 12, 2011$2,000 · 1 in hail · 3 events
- Damaging Winds in Virginia, September 12, 2011$6,000 · 56 kt wind · 2 events
- Marine Thunderstorm Wind in South Atlantic Coastal Waters, September 12, 201152 kt wind · 2 events
- Heavy Rain in Kentucky, September 12, 20111 event
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 347150, 347146, 347148, 347153, 347154, 347156, 347157, 348916, 348917, 348919, 348918, 348920, 348921, 348922.