A slow moving, severe thunderstorm moved across northern Alger county and out across Lake Superior. The storm caused significant tree damage along the shore of Lake Superior just south of M-28 due to straight-line winds.
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.
A slow moving, severe thunderstorm moved across northern Alger county and out across Lake Superior. The storm caused significant tree damage along the shore of Lake Superior just south of M-28 due to straight-line winds.
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 Aug 1, 3:22 PM EST, 38 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Marquette MI 345 PM EDT Tue Aug 1 2017 MIZ001>007-009>014-084-085-021945- Keweenaw-Ontonagon-Northern Houghton-Baraga-Marquette-Alger-Luce- Gogebic-Iron-Dickinson-Menominee-Delta-Southern Schoolcraft- Southern Houghton-Northern Schoolcraft- 345 PM EDT Tue Aug 1 2017 /245 PM CDT Tue Aug 1 2017/ This Hazardous Weather Outlook is for portions of western Upper Michigan and central Upper Michigan. .DAY ONE...Tonight Thunderstorms are expected through the afternoon and into the overnight hours across the west this evening, and central and east through the evening and overnight hours. A few storms could be strong to severe with quarter size hail, strong winds, and heavy rain. Areas with poor drainage or that see training precipitation may see localized flooding concerns. A moderate swim risk continues for the Lake Michigan beaches of southern Schoolcraft county this evening. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A moderate swim risk is expected for the beaches along the Alger and Marquette County shorelines of Lake Superior Wednesday into Wednesday evening. A moderate to high swim risk is expected for the beaches along the Alger and Marquette County shorelines of Lake Superior Friday. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. LSZ162-240>251-263>267-021945- 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- 345 PM EDT Tue Aug 1 2017 /245 PM CDT Tue Aug 1 2017/ This Hazardous Weather Outlook is for portions of Eastern Lake Superior...Central Lake Superior and Western Lake Superior. .DAY ONE...Tonight Thunderstorms are expected to push east across south central and eastern portions of the lake tonight. .DAYS TWO THROUGH SEVEN...Wednesday through Monday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. LMZ221-248-250-021945- 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- 345 PM EDT Tue Aug 1 2017 This Hazardous Weather Outlook is for portions of Northern Lake Michigan. .DAY ONE...Tonight Ongoing thunderstorms will be capable of producing strong winds and hail this evening. Another round of showers and storms is possible later tonight when a cold front pushes through. .DAYS TWO THROUGH SEVEN...Wednesday through Monday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. Ritzman
Special Weather Statement
National Weather Service Marquette MI
325 PM EDT TUE AUG 1 2017
MIZ005-013-012030-
Marquette MI-Delta MI-
325 PM EDT TUE AUG 1 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DELTA AND
SOUTHEASTERN MARQUETTE COUNTIES UNTIL 430 PM EDT...
At 325 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Rock to 9 miles east of La Branche.
Movement was east at 20 mph.
Half inch hail and winds in excess of 40 mph will be possible with
these storms.
Locations impacted include...
Gladstone, Rapid River, Rock, U.S. 41 between Trenary and Rapid
River, Brampton, Cornell, Maplewood, St. Nicholas, Perkins and
Lathrop.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional
information and possible warnings from the National Weather Service.
&&
LAT...LON 4581 8732 4589 8732 4590 8736 4616 8736
4618 8711 4616 8711 4616 8690 4580 8690
TIME...MOT...LOC 1925Z 259DEG 17KT 4609 8727 4588 8727
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</html>The Marquette radar (KMQT), 48 km away, was scanning. The volume nearest the first event began at 21:00 UTC.
1 marine thunderstorm wind. Local standard time, as filed.
Over 100 trees 1-2 feet in diameter were snapped and uprooted, with power lines downed as well.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Superior in 2017Every state in 2017This 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 2026-09-30. Each event’s entry at NCEI: 716487.