A slow moving cold front and unstable air mass resulted in severe thunderstorms with high winds and large hail during the late evening hours of August 27 and early August 28.
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 DLH wrote it up.
A slow moving cold front and unstable air mass resulted in severe thunderstorms with high winds and large hail during the late evening hours of August 27 and early August 28.
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 Duluth, MN wrote its last area forecast discussion before the first event at Aug 27, 5:06 PM CST, 5 hours 44 minutes earlier.
AREA FORECAST DISCUSSION...MESOSCALE UPDATE... NATIONAL WEATHER SERVICE DULUTH MN 606 PM CDT MON AUG 27 2007 .MESOSCALE UPDATE... ...CONCERNING INTENSE HP SUPERCELL LOCATED OVER AITKIN COUNTY... LATEST VOLUMETRIC REFLECTIVITY/VELOCITY DATA FROM KDLH INDICATE THAT THE STORM OVER AITKIN COUNTY..NEAR BIG SANDY LAKE..HAS BECOME A AN INTENSE HP SUPERCELL WITH 70 DBZ ECHO UP TO 33 KFT AGL AND A BWER CAPPED BY 60+ DBZ ECHO AT NEARLY 36 KFT. THIS INDICATES A GIANT HAIL THREAT WITH THIS STORM. BASEBALL SIZE HAIL JUST REPORTED AT BIG SANDY LAKE. AT ITS CURRENT MOVEMENT..THIS STORM WILL MOVE TO THE FLOODWOOD AND GOWAN AREA..AND EVENTUALLY HIGHWAY 53 BETWEEN CANYON AND INDEPENDENCE. THIS STORM APPEARS ELEVATED DUE TO THE STILL NORTHEAST MOVEMENT..BUT WE WILL NEED TO MONITOR THIS STORM CLOSELY FOR A RIGHT TURN..INDICATIVE OF THE STORM BECOMING MORE SURFACE BASED. IF SUCH A RIGHT TURN WERE TO OCCUR..IT WOULD ALSO BRING THIS STORM MUCH CLOSER TO THE DULUTH AREA PROPER. MILLER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DULUTH MN 400 AM CDT MON AUG 27 2007 LSZ121-140>148-162-MNZ010>012-018>021-025-026-033>038-WIZ001>004- 006>009-280900- BAYFIELD TO OAK POINT WI-GRAND PORTAGE TO GRAND MARAIS MN- GRAND MARAIS TO TACONITE HARBOR MN- TACONITE HARBOR TO SILVER BAY HARBOR MN- SILVER BAY HARBOR TO TWO HARBORS MN-TWO HARBORS TO DULUTH MN- DULUTH MN TO PORT WING WI-PORT WING TO SAND ISLAND WI- SAND ISLAND TO BAYFIELD WI-OAK POINT TO SAXON HARBOR WI- OPEN WATERS OF LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND PORTAGE MN-KOOCHICHING-NORTHERN ST. LOUIS- NORTHERN COOK/NORTHERN LAKE-NORTHERN ITASCA-CENTRAL ST. LOUIS- SOUTHERN LAKE/LAKESHORE-SOUTHERN COOK/LAKESHORE-NORTHERN CASS- SOUTHERN ITASCA-SOUTHERN CASS-CROW WING-NORTHERN AITKIN- SOUTHERN AITKIN-CARLTON/SOUTHERN ST. LOUIS-PINE-DOUGLAS-BAYFIELD- ASHLAND-IRON-BURNETT-WASHBURN-SAWYER-PRICE- 400 AM CDT MON AUG 27 2007 ...SLIGHT RISK OF SEVERE STORMS TODAY AND TONIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MINNESOTA... NORTHWEST WISCONSIN AND WESTERN LAKE SUPERIOR. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TODAY AND TONIGHT. THE MAIN HAZARDS WILL BE VERY LARGE HAIL AND DAMAGING WINDS. ISOLATED TORNADOES ARE ALSO POSSIBLE TO THE LEFT OF A LINE FROM WALKER...TO DEER RIVER...AND DULUTH MINNESOTA...TO SOLON SPRINGS...HAYWARD...AND SARONA WISCONSIN. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE CHANCE OF THUNDERSTORMS CONTINUES ON TUESDAY IN PINE COUNTY MINNESOTA...AS WELL AS NORTHWEST WISCONSIN. THE NEXT CHANCE OF THUNDERSTORMS IS NEXT WEEKEND. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION MAY BE NEEDED TODAY AND TONIGHT. GSF
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
605 PM CDT MON AUG 27 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0555 PM HAIL 7 N MCGREGOR 46.71N 93.31W
08/27/2007 M2.75 INCH AITKIN MN TRAINED SPOTTER
BASEBALL HAIL AT BIG SANDY LAKE, COVERING THE GROUND
0600 PM HAIL 8 N MCGREGOR 46.72N 93.31W
08/27/2007 M1.75 INCH AITKIN MN TRAINED SPOTTER
HAIL BROKE WINDSHIELD OF CAR
&&
TLONKAPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
702 PM CDT MON AUG 27 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0650 PM HAIL HILL CITY 46.99N 93.60W
08/27/2007 M0.75 INCH AITKIN MN TRAINED SPOTTER
&&
TLONKAPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
704 PM CDT MON AUG 27 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0658 PM HAIL 2 E HILL CITY 46.99N 93.55W
08/27/2007 M0.88 INCH AITKIN MN AMATEUR RADIO
&&
LILESThe Duluth radar (KDLH), 60 km away, was scanning. The volume nearest the first event began at 04:50 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Trees and limbs were blown down by the strong thunderstorm winds in an area from two to eight miles west of Port Wing.
The hail covered the ground.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2007Every state in 2007This day in weather historyWarnings in Wisconsin, August 2007
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: 54513, 54511.