Storm force winds developed ahead of and behind a cold frontal passage late on the 6th and into the 7th across portions of Lake Superior.
Every event with a place to put it. Tap one for its entry below.
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.
The episode as NWS MQT wrote it up.
Storm force winds developed ahead of and behind a cold frontal passage late on the 6th and into the 7th across portions of Lake Superior.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Marquette, MI wrote its last area forecast discussion before the first event at Sep 6, 2:45 PM EST, 15 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Marquette MI 351 PM EDT Sun Sep 6 2020 MIZ001-003-072000- Keweenaw-Northern Houghton- 351 PM EDT Sun Sep 6 2020 This Hazardous Weather Outlook is for portions of western Upper Michigan. .DAY ONE...Tonight There is a chance of thunderstorms this evening. West wind gusts of 45 to 50 mph are expected late tonight. See the latest Wind Advisory for more details. Waves building to 10 to 12 feet on western Lake Superior late tonight may cause minor lakeshore flooding and beach erosion along the western shore of the Keweenaw Peninsula. .DAYS TWO THROUGH SEVEN...Monday through Saturday Waves of 8 to 12 feet on western Lake Superior Monday morning may cause minor lakeshore flooding and beach erosion along the western and northern shores of the Keweenaw Peninsula. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report any lakeshore flooding the National Weather Service in Marquette. The public may also submit reports to the National Weather Service via phone, on our website, or through Facebook or Twitter using #906wx. MIZ006-007-013-014-072000- Alger-Luce-Delta-Southern Schoolcraft- 351 PM EDT Sun Sep 6 2020 This Hazardous Weather Outlook is for portions of central Upper Michigan. .DAY ONE...Tonight There is a chance of thunderstorms this afternoon through this evening. A few storms could be strong to locally severe and produce isolated large hail, mainly over south-central Upper Michigan. Waves build up to 6 feet in the Bay of Green Bay and up to 10 feet on northern Lake Michigan. These large waves will cause minor lakeshore flooding and beach erosion. See the latest Lakeshore Flood Advisory for more details. There is a high swim risk through this evening for the Lake Michigan beaches of Schoolcraft County. See the latest Beach Hazards Statement for details. .DAYS TWO THROUGH SEVEN...Monday through Saturday Waves building to 8 to 15 feet on eastern Lake Superior on Monday will likely cause lakeshore flooding and beach erosion along the eastern shore Upper Michigan from Au Train to Whitefish Point. See the latest Lakeshore Flood Advisory for more details. There is a high swim risk Monday for the Lake Superior beaches of Alger County, and a moderate to high swim risk Monday morning for Lake Michigan beaches of Schoolcraft County. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report any observed hail or lakeshore flooding the National Weather Service in Marquette. The public may also submit reports to the National Weather Service via phone, on our website, or through Facebook or Twitter using #906wx. MIZ002-004-005-009>012-084-085-072000- Ontonagon-Baraga-Marquette-Gogebic-Iron-Dickinson-Menominee- Southern Houghton-Northern Schoolcraft- 351 PM EDT Sun Sep 6 2020 /251 PM CDT Sun Sep 6 2020/ This Hazardous Weather Outlook is for portions of western Upper Michigan and central Upper Michigan. .DAY ONE...Tonight There is a chance of thunderstorms through this evening. A few storms could be strong to locally severe and produce isolated large hail, mainly over south-central Upper Michigan. Waves building to 10 to 12 feet on western Lake Superior late tonight may cause minor beach erosion along the western shore of Upper Michigan near and north of the Porcupine Mountains. .DAYS TWO THROUGH SEVEN...Monday through Saturday There is a moderate to high swim risk Monday for the Lake Superior beaches of Marquette County. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report any observed hail or lakeshore flooding the National Weather Service in Marquette. The public may also submit reports to the National Weather Service via phone, on our website, or through Facebook or Twitter using #906wx. LSZ162-240>251-263>267-072000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM-Saxon Harbor WI to Black River MI- Black River to Ontonagon MI- Ontonagon to Upper Entrance of Portage Canal MI- Upper Entrance of Portage Canal to Eagle River MI- Eagle River to Manitou Island MI- Manitou Island to Point Isabelle MI- Point Isabelle to Lower Entrance of Portage Canal MI- Lower Entrance of Portage Canal To Huron Islands MI Including Keweenaw and Huron Bays-Huron Islands to Marquette MI- Marquette to Munising MI-Munising to Grand Marais MI- Grand Marais to Whitefish Point MI- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 351 PM EDT Sun Sep 6 2020 /251 PM CDT Sun Sep 6 2020/ This Hazardous Weather Outlook is for portions of Eastern Lake Superior...Central Lake Superior and Western Lake Superior. .DAY ONE...Tonight There is a chance of thunderstorms through this evening. A few storms could be strong to locally severe and produce isolated large hail. South gales of 35 to 40 knots will continue over the east half of Lake Superior this evening. West to northwest gales of 40 to 45 knots expected to develop tonight across all of Lake Superior. See the latest Marine Weather Message and Open Lake Forecast for more details. .DAYS TWO THROUGH SEVEN...Monday through Saturday West to northwest gales of 40 to 45 knots are expected to continue Monday morning across all of Lake Superior. See the latest Marine Weather Message and Open Lake Forecast for more details. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. LMZ221-248-250-072000- Green Bay North of line from Cedar River MI to Rock Island Passage-Seul Choix Point to Point Detour MI- 5NM East of a line from Fairport MI to Rock Island Passage- 351 PM EDT Sun Sep 6 2020 This Hazardous Weather Outlook is for portions of Northern Lake Michigan. .DAY ONE...Tonight There is a chance of thunderstorms through this evening. A few storms could be strong to locally severe and produce isolated large hail. South gales of 35 to 40 knots will continue this afternoon into early this evening. A few west-northwest gale force gusts are possible late tonight. See the latest Marine Weather Message and Nearshore Marine Forecast for more details. .DAYS TWO THROUGH SEVEN...Monday through Saturday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. Ritzman
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</html>The national radar mosaic for the moment the first event began.
6 marine high wind. Local standard time, as filed.
Storm force south wind gusts to 59 mph were measured at the Grand Marais Light GLOS.
Storm force south wind gusts to 59 mph were measured at the Grand Marais Light GLOS.
Storm force wind gusts to 55 mph were measured at Rock of Ages Light.
Storm force west wind gusts to 62 mph were measured at the Stannard Rock Light Station.
Storm force west wind gusts to 56 mph were measured at the Granite Island Light.
Storm force west wind gusts to 56 mph were measured at the Granite Island Light.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Superior in 2020Every state in 2020This day in weather history
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: 922358, 922359, 922363, 922360, 922361, 922362.