Severe thunderstorms produced damaging wind in Jacobsville along the Keweenaw Bay on the 21st.
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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.
Severe thunderstorms produced damaging wind in Jacobsville along the Keweenaw Bay on the 21st.
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 21, 6:45 PM EST, 5 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE MARQUETTE MI 745 PM EDT FRI SEP 21 2007 UPDATED AVIATION SECTION FOR 00Z TAFS .SYNOPSIS... 19Z WATER VAPOR LOOP AND RUC 500MB HEIGHT ANALYSIS DEPICTED A TROUGH EXTENDING FROM MANITOBA INTO THE EASTERN DAKOTAS...WITH SW FLOW AHEAD OF IT INTO ONTARIO AND THE WESTERN GREAT LAKES. AT THE BASE OF THE TROUGH WAS A PRETTY IMPRESSIVE SHRTWV...WITH 500MB HEIGHT FALLS AT 12Z OF 70 DAM AT BIS. IMMEDIATELY AHEAD OF THE SHRTWV...THERE IS A 120 KT JET AROUND 200MB PER RUC ANALYSIS STRETCHING FROM INTERNATIONAL FALLS MN TO WATERTOWN SD. AHEAD OF THE JET...ELEVATED SHOWERS AND THUNDERSTORMS DEVELOPED ACROSS CENTRAL MN NORTHERN WI INTO UPPER MICHIGAN THIS MORNING...IN AN AREA OF STRONG 850MB THETA-E ADVECTION AND 850MB MOISTURE CONVERGENCE ON THE NOSE OF A 40KT LOW LEVEL JET. SOUTHERLY FLOW INCREASING DOWNSTREAM OF THE SHRTWV TROUGH...ALONG WITH DAYTIME HEATING MIXING THE LOW LEVEL JET SOME...HAS ALLOWED FOR A WEAKENING AND NORTHWARD LIFTING OF THE CONVECTION. MUCH OF IT IS NOW LOCATED OVER NORTHEAST LAKE SUPERIOR. VISIBLE SATELLITE IMAGERY SHOWS PARTLY SUNNY SKIES ACROSS UPPER MICHIGAN INTO THE EASTERN 2/3 OF WISCONSIN...WHILE SOME 3000-4000 FT STRAUTS IS SPREADING IN FROM WESTERN WI. THIS STRATUS IS FORMING BELOW A CAP OBSERVED ON THE 17Z MPX SOUNDING. THE PARTIAL CLEARING HAS ALLOWED TEMPERATURES TO CLIMB INTO THE UPPER 70S TO LOW 80S ACROSS MUCH OF UPPER MICHIGAN INTO WISCONSIN. IN ADDITION... DEWPOINTS HAVE CLIMBED INTO THE MID 60S...PERHAPS AIDED BY THE RAIN THIS MORNING. THIS WARMER AND MORE HUMID AIR IS LOCATED IN THE WARM SECTOR OF A 994 MB LOW JUST NE OF INTERNATIONAL FALLS MN. COLD FRONT ASSOCIATED WITH THE LOW STRETCHES SW THROUGH DLH AND DOWN TO MSP. SHOWERS AND THUNDERSTORMS HAVE FIRED ALONG THE FRONTAL BOUNDARY FROM NEAR MOOSE LAKE MN NORTHWARD AND FROM ROCHESTERN MN TO EAU CLAIRE WI. THESE STORMS HAVE FORMED WHERE THE UPPER TROUGH FORCING HAS MANAGED TO COOL THE CAP ENOUGH TO ALLOW WARMER AIR PARCELS NEAR THE SURFACE TO RISE TO THE TROPOPAUSE. GUSTS MAINLY IN THE LOW 30S KT HAVE BEEN REPORTED BEHIND THE FRONT...AIDED BY A 2 MB/HR PRESSURE RISE OVER WESTERN MN. FINALLY...ANOTHER UPPER TROUGH CAN BE SEEN DROPPING THROUGH BRITISH COLUMBIA WITH AN UPPER LOW OFF THE COAST OF CALIFORNIA. && .SHORT TERM (TONIGHT)... UPPER LEVEL TROUGH APPROACHING WESTERN MN IS PROGGED TO MOVE QUICKLY ACROSS UPPER MICHIGAN TONIGHT...REACHING EASTERN ONTARIO BY 12Z SAT. IN FACT...THE TROUGH DEEPENS...WITH 500MB HEIGHT FALLS OF 200-220 DAM OVER LAKE SUPERIOR BETWEEN 18Z-06Z. THE LIFTING AND DEEPENING OF THE TROUGH WILL CAUSE THE SURFACE LOW TO STRENGTHEN SIGNIFICANTLY... REACHING 977MB OVER SOUTHERN JAMES BAY AT 12Z SAT. WARM ADVECTION PERSISTING AHEAD OF THE TROUGH...LIKELY INCREASING DUE TO THE DEEPENING OF THE SURFACE LOW...SHOULD CONTINUE TRANSPORTING UNSTABLE AIR LOCATED OVER WISCONSIN INTO THE AREA. AS THE COLD FRONT AND UPPER LEVEL HEIGHT FALLS PUSH EAST...CAPPING OVER THE AREA WILL BE ERODED...SUSTAINING THE LINE OF CONVECTION AS IT MOVES ACROSS. LATEST MESOANLAYSIS DEPICTS 100MB MIXED LAYER CAPE VALUES OF 1500 J/KG OVER WESTERN WI WITH LITTLE CIN...AND THIS SHOULD MOVE INTO THE CWA TOO. REGARDING SEVERE POTENTIAL...THIS LOOKS REALLY GOOD WITH 0-6KM SHEAR OF 50-60 KT AND THE CAPE AVAILABLE. BOTH OF THESE WOULD SUPPORT ORGANIZED SEVERE STORMS. 50-55 KT WINDS ABOUT 2000-3000 FT ABOVE THE SURFACE SUGGESTS MOSTLY A DAMAGING WIND EVENT. HOWEVER... 0-3KM SRH HELICITY VALUES OF 300 M2/S2 AND 0-1KM SRH HELICITY VALUES OF 200 M2/S2 SUGGEST THAT IF ANY STORMS FIRE AHEAD OF THE MAIN LINE...THAT SUPERCELLS WITH TORNADOES ARE POSSIBLE. 20Z DAY 1 OUTLOOK CONTINUES WITH A MODERATE RISK OVER THE CENTRAL PORTION OF THE CWA WITH SLIGHT RISKS ELSEWHERE. A TORNADO WATCH HAS ALSO BEEN ISSUED FOR THE WEST HALF OF THE CWA. AFTER THE FRONT PASSES...THE STRONG PRESSURE RISES COMBINED WITH A TIGHT PRESSURE GRADIENT AND COOL AIR ADVECTION SHOULD SUPPORT GUSTS UP TO 50 KT OVER THE KEWEENAW FROM THE WSW TO W...PER MOMENTUM TRANSFER ON NAM SOUNDINGS. THUS THE GOING HIGH WIND WARNING AND ADVISORIES STILL SEEM REASONABLE. LIGHTER BUT STILL BREEZY WINDS ARE EXPECTED ELSEWHERE...SO ALTHOUGH THE SKIES MIGHT BE CLEARING OUT...THE WINDS WILL KEEP TEMPERATURES FROM RADIATING. KEPT THE COOLEST TEMPERATURES IN GOGEBIC COUNTY DUE TO ADVECTION OF LOWER READINGS. .LONG TERM (SAT THROUGH NEXT FRI)... SAT THROUGH TUE...A LOW PRESSURE SYSTEM DEVELOPING OVER THE NORTHERN PLAINS ON SUNDAY WILL DRAG A COLD FRONT ACROSS OUR CWA ON MONDAY AFTERNOON AND EVENING. THE TIMING OF THE FRONT IS NOT ENTIRELY AGREED UPON BETWEEN ALL MODELS...BUT ALL SEEM TO EXIT THE SYSTEM FROM OUR CWA BY 12Z TUE. THE NAM IS THE QUICKEST (ALTHOUGH ONLY GOES OUT TO 12Z MON) AND THE 12Z ECMWF IS THE SLOWEST. THE UKMET AND GFS ARE SOMEWHERE IN BETWEEN. ONLY CHANGE MADE WITH GOING FCST WAS TO MOVE CHC TSRA OVER WEST AND CENTRAL CWA 6 HRS EARLIER (NOW 12Z-00Z MON) AND INCREASE POPS TO 50 PERCENT. GFS SHOWS PRECIPITABLE WATER UP TO 1.9 INCHES MONDAY AFTERNOON AND EVENING. TUE NIGHT THROUGH FRIDAY...IN THE WAKE OF THE COLD FRONT...HIGH PRESSURE WILL SETTLE INTO THE WESTERN GREAT LAKES AREA. KEPT CLOUDY SKIES LINGERING UNTIL WED MORNING DUE TO ADDITIONAL 500MB VORTICITY ADVECTION. A SFC TROUGH EXTENDING FROM A SFC LOW OVER HUDSON BAY WILL TRACK ACROSS LAKE SUPERIOR THU MORNING. ADDED SCHC SHOWERS AND INCREASED CLOUD COVER ACROSS NORTHERN LAKE SUPERIOR AND TIP OF KEWEENAW TO ACCOUNT FOR THE POSSIBILITY OF FROPA PCPN. DID NOT MAKE MAJOR CHANGES TO THE REST OF THE FORECAST. THE REMAINING EXTENDED LOOKS QUIET AND THE NEXT SYSTEM TO WATCH FOR WILL BE A LOW PRES SYSTEM ENTERING OUR CWA FRI NIGHT AND SAT. && .AVIATION (FOR THE 00Z TAF ISSUANCE)... LINE OF SHOWERS AND THUNDERSTORMS WILL BE MOVING THROUGH THE TAF SITES VERY EARLY IN THE PERIOD...LIKELY EAST OF THEM BY 02Z. CONTINUED TO MENTION GUSTS TO AT LEAST 40 KT WITH THE SQUALL LINE AS PRESSURES MAY RISE QUICKLY WITHIN AND IMMEDIATELY BEHIND THE LINE. A REPORT FROM FREDA RIGHT BEHIND THE LINE HAD 44 MPH WINDS. THE STORMS ARE ORIENTED ALONG A COLD FRONT THAT STRETCHES FROM A DEEPENING LOW OVER NORTHERN ONTARIO SOUTHWARD INTO CENTRAL WI. BEHIND THE FRONT AND INTO SAT...THE MAIN CONCERN IS WIND AS CLEAR SKIES CURRENTLY OCCURRING OVER MUCH OF MN MOVE INTO UPPER MICHIGAN. BEHIND THE FRONT...VERY WINDY CONDITIONS ARE EXPECTED TO CONTINUE AT CMX...DUE TO RAPIDLY RISING PRESSURE...A TIGHT PRESSURE GRADIENT AND COOL AIR MOVING IN. AT SAW...A WEAKER PRESSURE GRADIENT COMBINED WITH LESS OF A PRESSURE RISE WILL RESULT IN BREEZY BUT LESSER WIND SPEEDS THAN CMX TONIGHT. BOTH SITES WILL SEE WINDS DIMINISH ON SAT AS A RIDGE OF HIGH PRESSURE BUILDS IN FROM THE WEST. && .MARINE (FOR THE 4 PM LAKE SUPERIOR FCST ISSUANCE)... LOW PRESSURE NE OF INTERNATIONAL FALLS WILL CONTINUE DEEPENING TONIGHT AS IT HEADS TOWARDS JAMES BAY. SOUTHERLY GALES REMAIN POSSIBLE ON BOTH HALVES OF LAKE SUPERIOR THIS EVENING...THOUGH MOST OF THIS WIND WILL BE EXPERIENCED ON HIGHER PLATFORMS. AFTER THE COLD FRONT ASSOCIATED WITH THE LOW PASSES...WINDS SHOULD INCREASE QUICKLY TO 40-45 KT ACROSS LAKE SUPERIOR. AS COLD AIR CONTINUES TO FILTER IN OVERNIGHT...THERE IS A POSSIBILITY FOR WINDS TO INCREASE TO 50 KT ON EASTERN LAKE SUPERIOR. EXPECT WINDS TO GRADUALLY SUBSIDE ON SAT ON LAKE SUPERIOR...WITH WINDS FALLING BELOW 20 KT BRIEFLY SAT NIGHT AS A RIDGE OF HIGH PRESSURE CROSSES. LOOK FOR THE HIGH TO DRIFT TO LAKE HURON ON SUN...RESULTING IN 15 TO 25 KT SOUTHERLY WINDS AGAIN ON LAKE SUPERIOR LATE SUN INTO MON MORNING. A LOW PRESSURE LIFTING NE FROM THE NORTHERN PLAINS INTO NORTHERN ONTARIO WILL BRING ANOTHER COLD FRONT ACROSS LAKE SUPERIOR LATE MON...WITH WINDS SHIFT TO THE NW NEAR 20 KT LATE MON NIGHT INTO TUE. HIGH PRESSURE BUILDING SOUTH OF LAKE SUPERIOR FROM THE PLAINS WILL ALLOW WINDS TO DROP BELOW 20 KT TUE NIGHT INTO WED. && .MQT WATCHES/WARNINGS/ADVISORIES... HIGH WIND WARNING FROM UNTIL 2 AM EDT SAT MIZ001-003. WIND ADVY UNTIL MIDNIGHT EDT FRI NIGHT MIZ006-007-085. WIND ADVY UNTIL 11 PM EDT FRI MIZ002-004-005-084. WIND ADVY UNTIL 7 PM CDT FRI MIZ009. GALE WARNING W HALF LAKE SUPERIOR THIS AFTN INTO TONIGHT. GALE WARNING E HALF LAKE SUPERIOR THIS AFTN INTO SAT. && SYNOPSIS/SHORT TERM...AJ LONG TERM...MRC AVIATION/MARINE...AJ
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MARQUETTE MI 438 PM EDT FRI SEP 21 2007 MIZ001>005-009>012-084-221200- KEWEENAW-ONTONAGON-NORTHERN HOUGHTON-BARAGA-MARQUETTE-GOGEBIC- IRON-DICKINSON-MENOMINEE-SOUTHERN HOUGHTON- 438 PM EDT FRI SEP 21 2007 /338 PM CDT FRI SEP 21 2007/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN UPPER MICHIGAN AND CENTRAL UPPER MICHIGAN. .DAY ONE...TONIGHT STRONG THUNDERSTORMS...SOME SEVERE...WILL DEVELOP AHEAD OF AND ALONG A COLD FRONT AND TRACK EASTWARD ACROSS UPPER MICHIGAN THIS EVENING. EXPECT THE FRONT TO REACH IRONWOOD AND HOUGHTON BETWEEN 5 AND 7 PM EDT...THEN SHIFT EASTWARD INTO CENTRAL UPPER MICHIGAN BY 10 PM EDT. DAMAGING WINDS...ALONG WITH LARGE HAIL AND HEAVY RAIN ARE EXPECTED WITH THE SEVERE STORMS. ISOLATED TORNADOES MAY ALSO OCCUR...ESPECIALLY WITH ANY STORMS THAT FORM AHEAD OF THE COLD FRONT. LOOK FOR SEVERE THUNDERSTORMS TO END BY MIDNIGHT. WIND GUSTS TO 45 MPH ARE EXPECTED OVER THE NORTH HALF OF UPPER MICHIGAN THROUGH LATE AFTERNOON. WEST WIND GUSTS TO 60 MPH ARE POSSIBLE OVER THE KEWEENAW LATE THIS AFTERNOON INTO THIS EVENING. PLEASE SEE THE LATEST NON PRECIPITATION WEATHER STATEMENT FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS MONDAY AFTERNOON AND MONDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE NEEDED THIS EVENING. LSZ221-241>248-263-264-221200- KEWEENAW BAY AND HURON BAY FROM LOWER ENTRANCE LIGHT TO PORTAGE LAKE TO HURON ISLANDS MI-SAXON HARBOR WI TO ONTONAGON MI- ONTONAGON TO UPPER ENTRANCE OF PORTAGE CANAL MI- UPPER ENTRANCE OF PORTAGE CANAL TO MANITOU ISLAND MI- MANITOU ISLAND TO LOWER ENTRANCE OF PORTAGE CANAL MI- HURON ISLANDS TO MARQUETTE MI-MARQUETTE TO MUNISING MI- MUNISING TO GRAND MARAIS MI-GRAND MARAIS TO WHITEFISH POINT MI- LAKE SUPERIOR, EAST OF A LINE FROM SAXON HARBOR WI TO GRAND PORTAGE, MN, TO A LINE NORTHWARD FROM MANITOU IS. MI, BEYOND 5 NM AND SOUTH OF THE US/CANADIAN BORDER- LAKE SUPERIOR, EAST OF A LINE FROM MANITOU IS. MI NORTHWARD BEYOND 5 NM AND SOUTH OF THE US/CANADIAN BORDER, EXCLUDING WHITEFISH BAY- 438 PM EDT FRI SEP 21 2007 /338 PM CDT FRI SEP 21 2007/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN LAKE SUPERIOR...CENTRAL LAKE SUPERIOR AND WESTERN LAKE SUPERIOR. .DAY ONE...TONIGHT A GALE WARNING IS IN EFFECT THROUGH SATURDAY WITH SOUTH GALES SHIFTING TO WEST GALES LATE THIS AFTERNOON AND THIS EVENING. WIND GUSTS TO 45 KNOTS ON THE WEST HALF AND GUSTS TO 50 KNOTS ON THE EAST HALF ARE EXPECTED TONIGHT. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS MONDAY AFTERNOON AND MONDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE NEEDED THIS EVENING. LMZ221-248-262-221200- BAY OF GREEN BAY NORTH OF LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-SEUL CHOIX POINT TO POINT DETOUR MI- LAKE MICHIGAN...FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE...SOUTHEASTWARD BEYOND 5 NM OFF SHORE TO THE MID- LINE OF THE LAKE- 438 PM EDT FRI SEP 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN LAKE MICHIGAN. .DAY ONE...TONIGHT STRONG THUNDERSTORMS WILL DEVELOP AHEAD OF AND ALONG A COLD FRONT THIS EVENING. SOME OF THE STORMS MAY PRODUCE HIGH WIND GUSTS AND LARGE HAIL. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS MONDAY AFTERNOON AND MONDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED. MIZ006-007-013-014-085-221200- ALGER-LUCE-DELTA-SOUTHERN SCHOOLCRAFT-NORTHERN SCHOOLCRAFT- 438 PM EDT FRI SEP 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL UPPER MICHIGAN. .DAY ONE...TONIGHT STRONG THUNDERSTORMS...SOME SEVERE...WILL DEVELOP AHEAD OF AND ALONG A COLD FRONT AND TRACK EASTWARD ACROSS UPPER MICHIGAN THIS EVENING. EXPECT THE FRONT TO REACH CENTRAL UPPER MICHIGAN BY 10 PM EDT. DAMAGING WINDS...ALONG WITH LARGE HAIL AND HEAVY RAIN ARE EXPECTED WITH THE SEVERE STORMS. ISOLATED TORNADOES MAY ALSO OCCUR...ESPECIALLY WITH ANY STORMS THAT FORM AHEAD OF THE COLD FRONT. LOOK FOR SEVERE THUNDERSTORMS TO END BY 2 AM EDT. WIND GUSTS TO 45 MPH ARE EXPECTED OVER THE NORTH HALF OF UPPER MICHIGAN EARLY THIS EVENING. PLEASE SEE THE LATEST NON PRECIPITATION WEATHER STATEMENT FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS MONDAY AFTERNOON AND MONDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE NEEDED THIS EVENING. MRC/ROLFSON
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MARQUETTE MI
628 PM EDT FRI SEP 21 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0623 PM TSTM WND GST 6 N IRONWOOD 46.54N 90.15W
09/21/2007 M70 MPH GOGEBIC MI AWOS
&&
AJSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MARQUETTE MI 653 PM EDT FRI SEP 21 2007 MIZ001-220000- KEWEENAW- 653 PM EDT FRI SEP 21 2007 ...SIGNIFICANT WEATHER ALERT FOR KEWEENAW COUNTY UNTIL 800 PM EDT... AT 645 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A SEVERE THUNDERSTORM 16 MILES SOUTHWEST OF WINDIGO...OR 46 MILES EAST OF GRAND MARAIS. THIS STORM WAS MOVING NORTHEAST AT 55 MPH. WINDS UP TO 50 MPH AND HEAVY DOWNPOURS ARE EXPECTED WITH THIS STORM. * LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE... WINDIGO. ROCK HARBOR. IF ON LAKE SUPERIOR...GET OUT OF THE WATER AND MOVE INDOORS OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE TO SAFE SHELTER NOW. DONT BE CAUGHT ON THE WATER IN A THUNDERSTORM A TORNADO WATCH REMAINS IN EFFECT FOR THE AREA. STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS CONCERNING THIS WEATHER SITUATION. PEARSON
The Marquette radar (KMQT), 82 km away, was scanning. The volume nearest the first event began at 23:48 UTC.
1 marine thunderstorm wind. Local standard time, as filed.
Five nine-inch diameter trees blown down in Jacobsville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Superior in 2007Every state in 2007This 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: 59033.