A waterspout was observed for 15 to 20 seconds over the Dead River Basin on the afternoon of the 11th.
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The episode as NWS MQT wrote it up.
A waterspout was observed for 15 to 20 seconds over the Dead River Basin on the afternoon of the 11th.
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 11, 12:23 PM EST, 1 hour 37 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MARQUETTE MI 123 PM EDT THU AUG 11 2011 UPDATED AVIATION DISCUSSION FOR 18Z TAFS .SYNOPSIS... WV IMAGERY AND RUC ANALYSIS INDICATED PROMINENT SHORTWAVE TROUGHS OVER WA AND SE ONTARIO WITH MAINLY JUST WEAK SHRTWVS EMBEDDED IN NW FLOWS FROM SRN CANADA INTO THE UPPER GREAT LAKES. ONE SHRTWV FROM SRN MANITOBA INTO CNTNRL ND SUPPORTED ISOLD TSRA WED EVENING FROM SE SASK INTO NW ND. AT THE SFC...A RIDGE EXTENDED FROM IA/IL INTO WRN ONTARIO RESULTING IN LIGHT WRLY FLOW ACROSS THE CWA. WAA/300K ISENTROPIC LIFT WAS ENOUGH TO SUPPORT SOME ISOLD SHOWERS/SPRINKLES OVER NORTH CNTRL WI AND MID CLOUDS INTO WEST UPPER MI. OTHERWISE...MAINLY CLEAR SKIES PREVAILED ACROSS THE CWA. && .DISCUSSION... TODAY...MAJORITY OF MODELS GENERATE SOME DIURNAL PCPN OVER MAINLY THE INTERIOR WEST HALF OF UPPER MI. THE LCL AND NCEP HIGH RES WRF/ARW MODELS KEEP THE PCPN MAINLY SOUTH OF THE MI/WI BORDER. WITH DEWPOINTS ONLY IN THE LOWER 50S...FCST MLCAPE VALUES THIS AFTERNOON INTO THE 400-800 J/KG RANGE ALONG WITH SOME WEAK SUPPORT FROM THE ND SHRTWV AND LAKE BREEZE BOUNDARIES MAY BE ENOUGH FOR TO TRIGGER SOME ISOLD SHRA/TSRA. WITH ONLY LIMITED COVERAGE OF ANY SHOWERS...SLIGHT CHANCE POPS STILL LOOK ON TRACK. INSTABILITY WILL ALSO BE MARGINAL FOR TSRA BUT GIVEN ISOLD TSRA WITH THE SHRTWV UPSTREAM...KEPT TSTM POTENTIAL IN THE FCST. TONIGHT...LOSS OF DIURNAL INSTABILITY AND GENERAL RIDGING OVER THE AREA SHOULD DISSIPATE ANY THU AFTERNOON SHOWERS DURING THE EARLY EVENING. ANOTHER WEAK SHORTWAVE MOVING INTO THE AREA ALONG WITH A BAND OF MOISTURE AND WEAK WAA/ISENTROPIC LIFT COULD BRING SHRA/TSRA INTO THE KEWEENAW LATE TONIGHT. FRI...MODELS SUGGEST POTENTIAL FOR ADDITIONAL WEAK SHORTWAVES MOVING THROUGH THE UPPER GREAT LAKES FRI AFTERNOON. EXPECT BETTER CHANCES FOR SHRA/TSRA AS LOW LEVEL MOISTURE CONTINUES TO INCREASE. GREATEST COVERAGE IS EXPECTED IN THE AFTERNOON INTO THE EVENING WITH MAX DIURNAL HEATING AND STRONGEST LAKE BREEZE BOUNDARY CONVERGENCE. FRI NIGHT INTO SAT...MODELS WERE CONSISTENT IN BRINGING WA MID LEVEL SHORTWAVE TROUGH THE NRN PLAINS AND MS VALLEY INTO WI AND LOWER MI. ALTHOUGH THE 12Z ECMWF AND GFS INDICATE THE GREATEST INSTABILITY AND FORCING ASSOCIATED WITH THIS FEATURE WILL REMAIN WEST AND SOUTH OF UPPER MI...STILL EXPECT THAT IT WILL MOVE CLOSE ENOUGH TO UPPER MI TO BRING SCT SHRA/TSRA AT LEAST TO MUCH OF THE CWA. WITH PWAT VALUES TO NEAR 1.25 INCHES RELATIVELY WEAK LOW/MID LEVEL WINDS/SHEAR THERE MAY BE THE POSSIBILITY OF SLOW MOVING SHRA/TSRA WITH VERY LOCALIZED HEAVY RAIN. EXPECT A GENERAL DIMINISHING TREND ON SHRA/TSRA BY LATE SAT AS SHORTWAVE AND ASSOC INVERTED SFC TROF SLIDE FARTHER SE. KEPT ONLY SLIGHT CHC POPS IN FAR SCNTRL PORTIONS FOR SAT EVENING BUT OTHERWISE EXPECT PCPN TO END SAT NIGHT ACROSS THE CWA. SUNDAY...HIGH PRESSURE WILL DOMINATE KEEPING WEATHER DRY. CAA NNE FLOW AHEAD OF ADVANCING SFC RDG WILL KEEP TEMPS COOLER ON SUNDAY WITH HIGHS GENERALLY IN THE LOW TO MID 70S. LOW TEMPS SUNDAY NIGHT COULD BE COOL UNDER HIGH PRESS RDG AND LGT WINDS. && .AVIATION /FOR THE 18Z TAF ISSUANCE/... EXPECT CONDITIONS TO REMAIN VFR THROUGH THE TAF PERIOD AT BOTH SITES. THE ONLY UNCERTAINTY IS THE DEVELOPMENT OF SHOWERS AND POSSIBLY A THUNDERSTORM AT KSAW. MORE IMPRESSIVE INSTABILITY EXISTS FURTHER TO THE SOUTH...HOWEVER CANNOT RULE OUT THE POSSIBILITY OF SHOWERS/THUNDERSTORMS DEVELOPING ON THE LAKE BREEZE BOUNDARY. WILL AMEND IF CONDITIONS BECOME MORE SUPPORTIVE OF SHOWERS NEAR KSAW. SOME ISOLATED SHOWERS NORTH OF THE KEWEENAW ASSOCIATED WITH A WEAK DISTURBANCE ARE EXPECTED TO STAY OUT OF KCMX. OTHERWISE...AS AN AREA OF LOW PRESSURE EXTENDING FROM THE DAKOTAS TO MANITOBA APPROACHES UPPER MICHIGAN...EXPECT CLOUD COVER TO GRADUALLY INCREASE INTO TOMORROW AFTERNOON. && .MARINE /FOR THE 4 AM LAKE SUPERIOR ISSUANCE/... HIGH PRESSURE MOVING INTO THE AREA FROM THE S TODAY WILL ALLOW WINDS TO GRADUALLY BECOME SW AHEAD OF A COLD FRONT THAT WILL PASS ACROSS THE LAKE FRIDAY NIGHT. HIGH PRESSURE WILL QUICKLY BUILD ACROSS THE LAKE SUNDAY WITH WINDS GENERALLY LESS THAN 20KTS. && .MQT WATCHES/WARNINGS/ADVISORIES... UPPER MICHIGAN... NONE. LAKE SUPERIOR... NONE. LAKE MICHIGAN... NONE. && SYNOPSIS...JLB DISCUSSION...JLB AVIATION...MCB MARINE...TITUS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MARQUETTE MI 540 AM EDT THU AUG 11 2011 MIZ001>007-009>014-084-085-121200- KEWEENAW-ONTONAGON-NORTHERN HOUGHTON-BARAGA-MARQUETTE-ALGER-LUCE- GOGEBIC-IRON-DICKINSON-MENOMINEE-DELTA-SOUTHERN SCHOOLCRAFT- SOUTHERN HOUGHTON-NORTHERN SCHOOLCRAFT- 540 AM EDT THU AUG 11 2011 /440 AM CDT THU AUG 11 2011/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN UPPER MICHIGAN AND CENTRAL UPPER MICHIGAN. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON...MAINLY OVER INLAND LOCATIONS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE FRIDAY THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... THE NEED FOR WEATHER SPOTTER REPORTS IS NOT ANTICIPATED AT THIS TIME. LSZ162-240>251-263>267-121200- 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- 540 AM EDT THU AUG 11 2011 /440 AM CDT THU AUG 11 2011/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN LAKE SUPERIOR...CENTRAL LAKE SUPERIOR AND WESTERN LAKE SUPERIOR. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS ARE POSSIBLE TONIGHT OVER WESTERN LAKE SUPERIOR. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE FRIDAY THROUGH SATURDAY ACROSS ALL OF LAKE SUPERIOR. .SPOTTER INFORMATION STATEMENT... THE NEED FOR WEATHER SPOTTER REPORTS IS NOT ANTICIPATED AT THIS TIME. LMZ221-248-250-121200- 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- 540 AM EDT THU AUG 11 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE FRIDAY THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... THE NEED FOR WEATHER SPOTTER REPORTS IS NOT ANTICIPATED AT THIS TIME. JLB
The Marquette radar (KMQT), 10 km away, was scanning. The volume nearest the first event began at 19:02 UTC.
1 tornado. Local standard time, as filed.
A waterspout was observed for 15 to 20 seconds near the north shore of the Dead River Basin.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2011Every state in 2011This day in weather historyThe tornado archive for Michigan, 2011Warnings in Michigan, August 2011
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: 342016.