Evening thunderstorms produced strong wind and small hail in portions of the Iron Range of the Arrowhead of Minnesota. The thunderstorm winds blew down trees, branches, and power lines contributing to local areas losing power.
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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 DLH wrote it up.
Evening thunderstorms produced strong wind and small hail in portions of the Iron Range of the Arrowhead of Minnesota. The thunderstorm winds blew down trees, branches, and power lines contributing to local areas losing power. Some homes were damaged from the downed trees.
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 Sep 5, 5:59 PM CST, 4 hours 31 minutes earlier.
Area Forecast Discussion National Weather Service Duluth MN 659 PM CDT MON SEP 5 2016 .SHORT TERM...(This evening through Tuesday) Issued at 307 PM CDT Mon Sep 5 2016 Little in the way of showers were occurring across the Northland as of 20Z and much of the guidance has had a good handle on that. A frontal boundary was located from a low center in northwest Ontario, through western Minnesota into Nebraska. This front is forecast to move slowly east tonight into Tuesday. There isn't great agreement in how far east this front will move, but overall consensus is that it will stretch from eastern Nebraska northeast into the western Upper Peninsula by 00Z Wednesday. We expect showers and storms to expand in coverage this evening and continue into Tuesday. Subsidence behind this mornings convection and subtle shortwave ridging in the broad southwest flow will diminish this evening allowing the continued warm air and moisture advection and convergence along the front to create more showers and storms. MUCAPE values were only from 100-500J/KG as of the 18Z SPC mesoanalysis, but these values have been rising through the afternoon and we expect that will continue. We expect some strong to severe storms to develop this evening, mainly after 01Z. Given the very high PWAT values for this time of year of 1.6 to nearly 2.0 inches, heavy rain will also be a concern. Fog will be possible as well tonight into early Tuesday morning. On Tuesday, the front will continue to make slow progress southeast and there may be a break in the showers and storms for a time, but additional strong to possibly severe storms are expected Tuesday afternoon into the evening and especially over northwest Wisconsin. Heavy rain will also be a threat. We will issue a Flood Watch for much of our northwest Wisconsin counties and for Pine County in Minnesota. A good portion Pine, Burnett and Douglas Counties all received 1 to around 2 inches of rain Sunday night. Since we expect a couple more periods of showers and storms with the potential for localized high amounts, we decided to go with a Flood Watch through Tuesday night. Areas of northern Minnesota north of Highway 2 should see showers and storms come to an end Tuesday afternoon, with coverage increasing in the afternoon over much of northwest Wisconsin. Expect low temperatures tonight from the middle sixties over northwest Wisconsin to the 55 to 60 toward International Falls. Tuesday's highs will be in the lower seventies toward International Falls and in the upper seventies over northwest Wisconsin. .LONG TERM...(Tuesday night through Monday) Issued at 307 PM CDT Mon Sep 5 2016 Tuesday night our very wet period continues, with another surge of warm moist advection along with a weak shortwave that pushes up along the baroclinic zone extending from central Nebraska northeast to Lake Superior. This should bring another wave of showers and thunderstorms to mainly the northwest Wisconsin counties of the forecast area. The main question will be just how much precipitation this brings. Precipitable water values remain very high through Tuesday night, ranging around 1.5 inches, which is in the 90-100th percentile, or in that 150-200% of normal. For now have some amounts of two to four tenths of an inch. While this is not very high, there are likely to be locally higher amounts and it will just augment the precipitation that fell last night, and what is expected in the next 24 hours. Thus, the flood watch continues Tuesday night. Heavy rainfall should come to an end Wednesday morning, though with the front and 850mb baroclinic zone still just southeast of the forecast area some chances for showers and thunderstorms continue through Wednesday. Wednesday night another upper level shortwave rolls through the area and will increase precipitation chances for Wednesday night and early Thursday once again. As the 850mb baroclinic zone and surface boundary will have sagged into Iowa and southern Wisconsin the deep moisture will return closer to seasonable values, and do not have the same concerns for heavy rainfall. We should get at a brief break Thursday afternoon/night before the next upper level shortwave moves across the Midwest and brings another round of showers and thunderstorms in the Friday, Friday night and Saturday time range. This storm looks strong and may also be able to bring heavy rainfall, though we will have to watch this carefully as there are some significant differences in the strength of this system as depicted by the models. Another break should be found in the Saturday night and/or Sunday time range, before precipitation chances return for early next week. && .AVIATION...(For the 00Z TAFS through 00Z Tuesday evening) Issued at 656 PM CDT Mon Sep 5 2016 Another round of showers and thunderstorms will move through the Northland overnight, bringing widespread showers and thunderstorms. CIG's and VSBY's will range generally start at VFR, but transition to MVFR and even IFR in spots overnight. Some of the storms may be on the strong side, with some hail and gusty winds. Some improvement may develop toward midday on Tuesday, before another round of showers and storms moves in again. It's going to be an unsettled week aviation-wide with changing conditions quite often. && .PRELIMINARY POINT TEMPS/POPS... DLH 64 74 58 66 / 70 40 30 40 INL 56 72 51 71 / 40 10 10 20 BRD 63 74 58 71 / 60 40 20 40 HYR 68 78 62 71 / 70 70 60 60 ASX 66 79 61 69 / 70 60 50 50 && .DLH Watches/Warnings/Advisories... WI...Flood Watch through Wednesday morning for WIZ001>003-006>009. MN...Flood Watch through Wednesday morning for MNZ038. LS...None. && SHORT TERM...Melde LONG TERM...LE AVIATION...DAP
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DULUTH MN 325 PM CDT MON SEP 5 2016 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-061030- KOOCHICHING-NORTH ST. LOUIS-NORTHERN COOK/NORTHERN LAKE- NORTH ITASCA-CENTRAL ST. LOUIS-SOUTHERN LAKE/NORTH SHORE- SOUTHERN COOK/NORTH SHORE-NORTH CASS-SOUTH ITASCA-SOUTH CASS- CROW WING-NORTHERN AITKIN-SOUTH AITKIN-CARLTON/SOUTH ST. LOUIS- PINE-DOUGLAS-BAYFIELD-ASHLAND-IRON-BURNETT-WASHBURN-SAWYER-PRICE- 325 PM CDT MON SEP 5 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN. .DAY ONE...THIS AFTERNOON AND TONIGHT SHOWERS AND THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE TONIGHT. SOME OF THE STORMS MAY BE SEVERE AND PRODUCE LARGE HAIL...DAMAGING WIND...AND VERY HEAVY RAINFALL. A FLOOD WATCH HAS BEEN ISSUED FOR MUCH OF NORTHWEST WISCONSIN INTO PINE COUNTY IN MINNESOTA. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SHOWERS AND THUNDERSTORMS WILL CONTINUE TUESDAY WITH A RISK OF SEVERE STORMS OVER MAINLY NORTHWEST WISCONSIN THROUGH TUESDAY EVENING. IN ADDITION TO THE SEVERE THREAT...THERE WILL BE A CHANCE FOR HEAVY RAIN AND FLOODING WITH THE STORMS. MULTIPLE ROUNDS OF THUNDERSTORMS ARE EXPECTED TUESDAY NIGHT INTO THE WEEKEND. THE RISK FOR SEVERE STORMS BEYOND TUESDAY EVENING IS LOW. THERE WILL ALSO BE A RISK FOR HEAVY RAIN AS REPEATED ROUNDS OF SHOWERS AND STORMS IMPACT THE AREA. AT THIS TIME...NORTHWEST WISCONSIN INTO ADJACENT AREAS OF MINNESOTA LOOK MOSTLY LIKELY TO SEE THE HEAVIEST RAINFALL AND A FLOOD WATCH HAS BEEN ISSUED FOR THESE AREAS TONIGHT INTO TUESDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTERS MAY BE NEEDED LATER THIS EVENING. LSZ121-140>148-061030- 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- 325 PM CDT MON SEP 5 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NEARSHORE WATERS OF WESTERN LAKE SUPERIOR. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS ARE EXPECTED TO MOVE ACROSS WESTERN LAKE SUPERIOR LATER TONIGHT...SOME OF WHICH MAY BE SEVERE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY MULTIPLE ROUNDS OF THUNDERSTORMS ARE POSSIBLE THROUGH THE WORK WEEK INTO THE WEEKEND. THE BEST CHANCE FOR WIDESPREAD STORMS ACROSS WESTERN LAKE SUPERIOR WILL BE WEDNESDAY NIGHT. INCREASING EASTERLY WINDS MID-WEEK WILL RESULT IN BUILDING WAVES WEDNESDAY AND WEDNESDAY NIGHT...ESPECIALLY AT THE HEAD OF THE LAKE AND AROUND THE APOSTLE ISLANDS. A SMALL CRAFT WILL LIKELY BE NEEDED FOR PARTS OF THE NEARSHORE WATERS OF WESTERN LAKE SUPERIOR WEDNESDAY AND WEDNESDAY NIGHT. MELDE/LE MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING WEB ADDRESS: HTTP://WWW.WEATHER.GOV/DULUTH (ALL LOWER CASE)
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
854 PM CDT MON SEP 5 2016
MNZ012-020-021-060245-
SOUTHERN LAKE/NORTH SHORE-NORTHERN COOK/NORTHERN LAKE-SOUTHERN
COOK/NORTH SHORE-
854 PM CDT MON SEP 5 2016
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN LAKE AND
SOUTHWESTERN COOK COUNTIES...
AT 854 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING FROM
8 MILES NORTHWEST OF BEAVER BAY...TO 6 MILES NORTHWEST OF SAND
ISLAND...AND MOVING NORTHEAST AT 50 MPH.
WIND GUSTS UP TO 35 MPH...PEA SIZE HAIL...HEAVY DOWNPOURS...AND
OCCASIONAL CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THESE
STORMS.
THESE STORMS WILL BE NEAR...
FINLAND AND ILLGEN CITY AROUND 910 PM CDT.
LITTLE MARAIS AROUND 915 PM CDT.
CLEAR LAKE AROUND 925 PM CDT.
TACONITE HARBOR AROUND 930 PM CDT.
TOFTE AROUND 935 PM CDT.
LUTSEN AROUND 945 PM CDT.
OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE TEMPERANCE RIVER
STATE PARK...GEORGE MANITOU STATE PARK...WILSON LAKE...WHITE PINE
LAKE... CARIBOU LAKE...TETTEGOUCHE STATE PARK...CRESCENT LAKE AND
CASCADE RIVER STATE PARK.
SEEK SHELTER INSIDE A STURDY BUILDING AND AWAY FROM WINDOWS UNTIL
THESE STORMS PASS.
LAT...LON 4758 9074 4736 9111 4725 9121 4719 9130
4735 9154 4788 9080 4767 9051
TIME...MOT...LOC 0154Z 228DEG 43KT 4731 9145 4705 9105
DAPSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DULUTH MN 917 PM CDT MON SEP 5 2016 MNZ019-026-060245- SOUTH ITASCA-CENTRAL ST. LOUIS- 917 PM CDT MON SEP 5 2016 ...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ST. LOUIS AND SOUTHEASTERN ITASCA COUNTIES... AT 917 PM CDT...A STRONG THUNDERSTORM WAS NEAR WARBA...OR 8 MILES SOUTHEAST OF GRAND RAPIDS...MOVING NORTHEAST AT 45 MPH. WIND GUSTS UP TO 35 MPH...HALF INCH HAIL...HEAVY DOWNPOURS...AND OCCASIONAL CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THIS STORM. THIS STORM WILL BE NEAR... WARBA AROUND 920 PM CDT. PENGILLY AROUND 935 PM CDT. NASHWAUK AROUND 940 PM CDT. KEEWATIN AROUND 945 PM CDT. OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE SILICA...SWAN LAKE... FLOODWOOD LAKE...CALUMET...KELLY LAKE...LITTLE SWAN...HART LAKE... GOODLAND...LEETONIA AND BLACKBERRY. SEEK SHELTER INSIDE A STURDY BUILDING AND AWAY FROM WINDOWS UNTIL THIS STORM PASSES. LAT...LON 4704 9341 4721 9353 4747 9295 4720 9273 TIME...MOT...LOC 0217Z 239DEG 41KT 4717 9336 DAP
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
956 PM CDT MON SEP 5 2016
MNZ018-025-026-060330-
NORTH CASS-NORTH ITASCA-SOUTH ITASCA-
956 PM CDT MON SEP 5 2016
...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN CASS AND
SOUTHEASTERN ITASCA COUNTIES...
AT 956 PM CDT...AN AREA OF STRONG THUNDERSTORMS WAS OVER DAYS HIGH
LANDING...OR 12 MILES WEST OF GRAND RAPIDS...MOVING NORTHEAST AT 50
MPH.
WIND GUSTS UP TO 30 MPH...PEA SIZE HAIL...HEAVY DOWNPOURS...AND
OCCASIONAL CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THESE
STORMS.
THESE STORMS WILL BE NEAR...
COHASSET AND POKEGAMA LAKE AROUND 1005 PM CDT.
POKEGAMA DAM AROUND 1010 PM CDT.
GRAND RAPIDS AND GUNN AROUND 1015 PM CDT.
COLERAINE AROUND 1020 PM CDT.
TACONITE AROUND 1025 PM CDT.
NASHWAUK AND PENGILLY AROUND 1030 PM CDT.
OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE LAWRENCE LAKE...
CALUMET...SCHOOLCRAFT STATE PARK...HART LAKE...BLACKBERRY...LA
PRAIRIE... HILL ANNEX MINE STATE PARK...WABANA LAKE...BOVEY AND SWAN
LAKE.
SEEK SHELTER INSIDE A STURDY BUILDING AND AWAY FROM WINDOWS UNTIL
THESE STORMS PASS.
LAT...LON 4725 9395 4755 9332 4720 9306 4719 9307
4709 9384
TIME...MOT...LOC 0256Z 244DEG 43KT 4721 9379
DAPSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
958 PM CDT MON SEP 5 2016
MNZ025-035-060330-
NORTH CASS-NORTHERN AITKIN-
958 PM CDT MON SEP 5 2016
...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN CASS COUNTY...
AT 958 PM CDT...A STRONG THUNDERSTORM WAS OVER LONGVILLE...OR 17
MILES EAST OF WALKER...MOVING NORTHEAST AT 50 MPH.
WIND GUSTS UP TO 30 MPH...PEA SIZE HAIL...HEAVY DOWNPOURS...AND
OCCASIONAL CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THIS STORM.
THIS STORM WILL BE NEAR...
BOY RIVER AROUND 1010 PM CDT.
REMER AROUND 1015 PM CDT.
OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE BOY
LAKE...INGUADONA... GOOSE LAKE...THUNDER LAKE...TOBIQUE...MUD
LAKE...LAURA LAKE AND BREVIK.
SEEK SHELTER INSIDE A STURDY BUILDING AND AWAY FROM WINDOWS UNTIL
THIS STORM PASSES.
LAT...LON 4734 9400 4734 9398 4731 9394 4731 9392
4707 9377 4703 9377 4703 9375 4697 9371
4691 9427 4709 9438
TIME...MOT...LOC 0258Z 244DEG 43KT 4703 9422
DAPSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DULUTH MN 1034 PM CDT MON SEP 5 2016 MNZ018-019-026-060400- NORTH ITASCA-SOUTH ITASCA-CENTRAL ST. LOUIS- 1034 PM CDT MON SEP 5 2016 ...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ST. LOUIS AND EAST CENTRAL ITASCA COUNTIES... AT 1034 PM CDT...A STRONG THUNDERSTORM WAS OVER NASHWAUK...OR 13 MILES WEST OF HIBBING...MOVING NORTHEAST AT 50 MPH. WIND GUSTS UP TO 40 MPH...PENNY SIZE HAIL...HEAVY DOWNPOURS...AND OCCASIONAL CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THIS STORM. THIS STORM WILL BE NEAR... KEEWATIN AROUND 1040 PM CDT. HIBBING AROUND 1045 PM CDT. CHISHOLM AROUND 1055 PM CDT. BUHL AROUND 1100 PM CDT. OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE LAWRENCE LAKE...SWAN LAKE...IRON JUNCTION...CALUMET...KELLY LAKE...BUCK LAKE...KINNEY...MARBLE... LEETONIA AND HILL ANNEX MINE STATE PARK. SEEK SHELTER INSIDE A STURDY BUILDING AND AWAY FROM WINDOWS UNTIL THIS STORM PASSES. LAT...LON 4722 9332 4742 9348 4769 9282 4740 9259 TIME...MOT...LOC 0334Z 243DEG 45KT 4739 9323 DAP
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DULUTH MN 1126 PM CDT MON SEP 5 2016 MNZ019-060500- CENTRAL ST. LOUIS- 1126 PM CDT MON SEP 5 2016 ...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL ST. LOUIS COUNTY... AT 1126 PM CDT...AN AREA OF STRONG THUNDERSTORMS WAS OVER MOUNTAIN IRON...OR 16 MILES NORTHEAST OF HIBBING...MOVING NORTHEAST AT 45 MPH. WIND GUSTS UP TO 35 MPH...PENNY SIZE HAIL...HEAVY DOWNPOURS...AND OCCASIONAL CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THESE STORMS. THESE STORMS WILL BE NEAR... EVELETH AROUND 1130 PM CDT. VIRGINIA AROUND 1135 PM CDT. GILBERT AROUND 1140 PM CDT. BIWABIK AROUND 1145 PM CDT. AURORA AROUND 1150 PM CDT. EMBARRASS AROUND 1155 PM CDT. HOYT LAKES AROUND 1200 AM CDT. OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE IRON JUNCTION...WYNNE LAKE...MESABA...LEONIDAS...FRANKLIN...KINNEY...MCKINLEY...ESQUAGAMA LAKE... WEST TWO RIVERS RESERVOIR AND RIDGE. SEEK SHELTER INSIDE A STURDY BUILDING AND AWAY FROM WINDOWS UNTIL THESE STORMS PASS. LAT...LON 4737 9266 4754 9277 4779 9212 4755 9195 TIME...MOT...LOC 0426Z 244DEG 41KT 4749 9262 DAP
The Duluth radar (KDLH), 83 km away, was scanning. The volume nearest the first event began at 04:29 UTC.
3 thunderstorm wind, 2 hail. Local standard time, as filed.
Winds blew down power lines contributing to power outages in the area.
There were large branches blown down and power outages in the area.
Large trees were blown down causing damage to homes in the area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2016Every state in 2016This day in weather historyWarnings in Minnesota, September 2016
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: 657304, 657301, 657307, 657309, 657303.