A surface trough moving through a very warm and unstable air mass provided the focus for scattered strong to severe thunderstorms over Lake Superior from late evening on the 25th into the early morning of the 26th.
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 surface trough moving through a very warm and unstable air mass provided the focus for scattered strong to severe thunderstorms over Lake Superior from late evening on the 25th into the early morning of the 26th.
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 25, 6:34 PM EST, 4 hours 26 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MARQUETTE MI 456 PM EDT SUN AUG 25 2013 MIZ001>007-009>014-084-085-261200- KEWEENAW-ONTONAGON-NORTHERN HOUGHTON-BARAGA-MARQUETTE-ALGER-LUCE- GOGEBIC-IRON-DICKINSON-MENOMINEE-DELTA-SOUTHERN SCHOOLCRAFT- SOUTHERN HOUGHTON-NORTHERN SCHOOLCRAFT- 456 PM EDT SUN AUG 25 2013 /356 PM CDT SUN AUG 25 2013/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN UPPER MICHIGAN AND CENTRAL UPPER MICHIGAN. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS EVENING AND THEN DIMINISH LATE IN THE NIGHT. SOME OF THE THUNDERSTORMS COULD BE SEVERE...PRODUCING DAMAGING WINDS AND LARGE HAIL. HEAVY RAINFALL IS LIKELY WITH ANY THUNDERSTORMS THAT OCCUR. THE COMBINATION OF HOT AIR AND HIGH HUMIDITY WILL RESULT IN HEAT INDEX VALUES IN THE MID AND UPPER 90S INTO THE EARLY EVENING HOURS. SEE THE LATEST SPECIAL WEATHER STATEMENT FOR COMPLETE DETAILS ON THE HEAT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A HOT AND HUMID AIR MASS WILL REMAIN OVER UPPER MICHIGAN ON MONDAY. THIS WILL RESULT IN THE HEAT INDEX RISING TO AS HIGH AS THE MID AND UPPER 90S MONDAY AFTERNOON...ESPECIALLY OVER SOUTH CENTRAL UPPER MICHIGAN. SEE THE LATEST SPECIAL WEATHER STATEMENT FOR COMPLETE DETAILS ON THE HEAT. PERIODS OF THUNDERSTORMS ARE EXPECTED MONDAY THROUGH TUESDAY EVENING. THE MOST LIKELY TIME PERIOD FOR THUNDERSTORMS WILL BE LATE MONDAY NIGHT AND TUESDAY WHEN HEAVY RAINFALL AND ISOLATED SEVERE STORMS WILL ALSO BE POSSIBLE. THUNDERSTORMS ARE POSSIBLE AGAIN FRIDAY NIGHT AND SATURDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO SUBMIT REPORTS TO THE NATIONAL WEATHER SERVICE IN MARQUETTE. THE PUBLIC MAY ALSO SUBMIT REPORTS AT OUR WEBPAGE...FACEBOOK PAGE...OR ON TWITTER. LSZ162-240>251-263>267-261200- 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- 456 PM EDT SUN AUG 25 2013 /356 PM CDT SUN AUG 25 2013/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN LAKE SUPERIOR...CENTRAL LAKE SUPERIOR AND WESTERN LAKE SUPERIOR. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS MAINLY SOUTHERN PORTIONS OF LAKE SUPERIOR TONIGHT. THE STORMS WILL DIMINISH OVERNIGHT. THE STRONGER THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL AND MAY CONTAIN GUSTY WINDS AND SMALL HAIL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE MONDAY NIGHT AND TUESDAY...AND THEN FRIDAY NIGHT AND SATURDAY. .SPOTTER INFORMATION STATEMENT... THE NEED FOR WEATHER SPOTTER REPORTS IS NOT ANTICIPATED AT THIS TIME. LMZ221-248-250-261200- 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- 456 PM EDT SUN AUG 25 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN LAKE MICHIGAN. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TONIGHT. THE THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL...AND SOME STORMS COULD BE SEVERE...PRODUCING DAMAGING WINDS AND LARGE HAIL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY PERIODS OF THUNDERSTORMS ARE EXPECTED MONDAY THROUGH TUESDAY NIGHT...WITH THUNDERSTORMS MOST LIKELY TO OCCUR LATE MONDAY NIGHT AND TUESDAY. .SPOTTER INFORMATION STATEMENT... THE NEED FOR WEATHER SPOTTER REPORTS IS NOT ANTICIPATED AT THIS TIME. ROLFSON
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</html>The Duluth radar (KDLH), 139 km away, was scanning. The volume nearest the first event began at 03:59 UTC.
10 marine thunderstorm wind. Local standard time, as filed.
Wind gusts at the Saxon Harbor GLOS station were measured between 45 and 54 mph.
Measured wind gust at Western Lake Superior buoy 45006.
Wind gusts at the Big Bay Light GLOS measured between 43 and 46 mph.
Wind gusts at Granite Island Light measured near or over 50 mph through the period.
Measured wind gust at the Stannard Rock C-MAN station.
Measured wind gust at the Big Bay Light GLOS.
Measured wind gust at the Munising ASOS.
Measured wind gust at the Munising ASOS.
Trees and power lines were reported down across Northern Luce County including Muskallonge State Park.
Trees and power lines were reported down across Northern Luce County including Muskallonge State Park.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Superior in 2013Every state in 2013This 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 2026-09-24. Each event’s entry at NCEI: 467261, 467262, 467263, 467266, 467265, 467264, 467267, 467268, 467269, 467270.