A bow-like thunderstorm moved across from Minnesota into Wisconsin producing strong winds that caused tree damage in Burnett County on the evening of July 17th. The winds knocked down a large tree that subsequently blocked a lane of traffic between Oakland and Jackson Township in Wisconsin.
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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.
A bow-like thunderstorm moved across from Minnesota into Wisconsin producing strong winds that caused tree damage in Burnett County on the evening of July 17th. The winds knocked down a large tree that subsequently blocked a lane of traffic between Oakland and Jackson Township in Wisconsin.
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 Jul 17, 6:56 PM CST, 29 minutes earlier.
Area Forecast Discussion National Weather Service Duluth MN 756 PM CDT Mon Jul 17 2017 .UPDATE... Issued at 754 PM CDT Mon Jul 17 2017 Added Bayfield and Sawyer counties to the watch through 04z. The line is steadly moving east through continued unstable air. The storms should finally decrease in intensity by the end of the watch. Rest of fcst unchnaged. && .SHORT TERM...(This evening through Tuesday) Issued at 335 PM CDT Mon Jul 17 2017 At 330 PM, storms were rapidly developing just west of the CWA. A new severe thunderstorm watch was just issued by the Storm Prediction Center, for much of our northeast Minnesota CWA, the western Lake Superior Nearshore waters and far northwest Wisconsin. Temperatures had soared to near 90 in the Brainerd Lakes region, although showers and storms north of the Iron Range had limited temps into the 70s and lower 80s. Dewpoints were in the low to mid 70s across much of northeast Minnesota, in the warm sector ahead of the frontal boundary moving into western MN. The obvious focus for tonight will be the threat of severe weather. Severe Thunderstorm Watch 418 has just been issued until 11 PM this evening for much of the CWA. CAM's continue to be all over the place, as expected, but the consensus among them is that there will be some agreement concerning mode, with storms starting as discrete cells, and eventually evolving into line and bowing segments. Large hail, along with damaging winds, appear to be the main threat. There is some potential for tornadoes, but not enough at this point for a TOR watch. Will be a warm and humid night across the Northland, with lows ranging from the 50s in the far north, to the upper 60s to around 70 in the far south. The frontal boundary will begin to sag to a west-east alignment on Tuesday, with the brunt of the precipitation stretching from the Brainerd Lakes, to the Twin Ports, and points south. The heaviest rainfall on Tuesday is expected from east central Minnesota into northern Wisconsin. Some potential for severe storms across our far southern areas on Tuesday, with the best chance just south of our CWA. Highs will range from the 70s to lower 80s. .LONG TERM...(Tuesday night through Monday) Issued at 335 PM CDT Mon Jul 17 2017 The long-term forecast period is highlighted by temperatures near average, along with a few off-and-on chances of showers and thunderstorms. Tuesday night, a mid-level shortwave will be passing just to our south, which will support a chance of showers and storms, mainly to the far southeast corner of our forecast area. Another shortwave will arrive Wednesday afternoon and evening per the 17.12z NAM and GFS model runs, which will linger through Wednesday night, so it should be a quick chance of showers and storms. The 17.12z GFS is hinting at potentially some strong to severe storms over our south with MLCAPE up to 3000 J/kg. However, the NAM/ECMWF/CMC models are nowhere near as high with the instability, so confidence in severe potential for this time frame is very low. However, the Storm Prediction Center Day 3 convective outlook does have a Marginal Risk of severe weather just to our south over southern Minnesota. If the models all trend toward the GFS, this convective risk would creep farther north. High temperatures Wednesday through Friday will be in the upper 70s and lower 80s. A brief dry period will begin Thursday morning, lasting through early Friday morning, due to sfc high pressure building into the region from southern Manitoba Canada. However, another series of shortwaves look to bring off-and-on chances of showers and storms during the day Friday and through the weekend, especially for Saturday afternoon and evening. There are some model disagreements between the GFS/ECMWF/CMC models as the GFS and ECMWF has precipitation occurring over the Northland by 00z Sunday, yet the Canadian model has no on-going precipitation at that time. Similar disagreement between the models exist for Monday, only the model solutions have flipped among these three. Temperatures from Saturday through Monday will be a bit cooler compared to the days prior, with highs in the mid to upper 70s for this period. && .AVIATION...(For the 00Z TAFS through 00Z Tuesday evening) Issued at 619 PM CDT Mon Jul 17 2017 An area of strong to severe thunderstorms are moving through NE MN at issuance time. When the storms went through BRD, they had 45-55 mph wind gusts and IFR conditions. They will affect HIB/DLH between 00z-02z with the same conditions. The storms will affect hyr between 02-06z. After the storms pass, conditions will be vfr with MVFR conditins in fog. All sites will be VFR during the day on Tuesday. && .PRELIMINARY POINT TEMPS/POPS... DLH 63 77 57 80 / 80 30 10 10 INL 55 80 52 79 / 60 10 0 20 BRD 66 80 57 82 / 70 50 10 30 HYR 68 85 56 83 / 60 60 30 10 ASX 66 82 56 83 / 60 60 20 10 && .DLH WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. LS...None. && UPDATE...Stewart SHORT TERM...DAP LONG TERM...JTS AVIATION...Stewart
Hazardous Weather Outlook National Weather Service Duluth MN 343 PM CDT Mon Jul 17 2017 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-181245- 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- 343 PM CDT Mon Jul 17 2017 This Hazardous Weather Outlook is for portions of northeast Minnesota and northwest Wisconsin. .DAY ONE...This afternoon and Tonight Strong to severe thunderstorms are expected to develop across north-central Minnesota later this afternoon and track eastward into northeast Minnesota towards this evening. The strongest storms will be capable of producing large hail and damaging winds, with a small chance of a tornado. A Severe Thunderstorm Watch has been issued for all of north-central and northeast Minnesota, as well as portions of northwest Wisconsin for this afternoon and evening. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Another round of strong to severe thunderstorms are expected Tuesday, mainly for east central Minnesota into northwest Wisconsin. Thunderstorms are possible from central Minnesota to northwest Wisconsin Wednesday afternoon through Thursday morning. Thunderstorms are possible across northeast Minnesota and northwest Wisconsin Friday afternoon, and again Saturday afternoon through Saturday night. .SPOTTER INFORMATION STATEMENT... Skywarn Spotters will be needed this afternoon into this evening across much of north-central and northeast Minnesota and portions of northwest Wisconsin. Please report hail of any size, damaging winds, and heavy rainfall amounts. LSZ121-140>148-181245- 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- 343 PM CDT Mon Jul 17 2017 This Hazardous Weather Outlook is for portions of the Nearshore waters of western Lake Superior. .DAY ONE...This afternoon and Tonight Strong to severe thunderstorms will be possible over the western Lake Superior nearshore waters later this evening and overnight. Some storms may cause damaging winds, large hail, cloud-to-water lightning, and heavy downpours. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorms will be possible during the day Tuesday. Another chance of thunderstorms will be possible Saturday afternoon through Sunday morning. JTS More information may be obtained at the following web address: http://www.weather.gov/duluth (all lower case)
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
732 PM CDT MON JUL 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 PM HEAVY RAIN 4 E ZEMPLE 47.31N 93.70W
07/17/2017 M1.01 INCH ITASCA MN PUBLIC
RAINFALL IN A 1 HOUR 15 MINUTE PERIOD.
&&
BJHSpecial Weather Statement National Weather Service Duluth MN 747 PM CDT MON JUL 17 2017 MNZ019-180100- Central St. Louis- 747 PM CDT MON JUL 17 2017 ...A STRONG THUNDERSTORM WILL AFFECT CENTRAL ST. LOUIS COUNTY... At 747 PM CDT, a strong thunderstorm was 9 miles west of Embarrass, or 15 miles south of Lake Vermilion, moving east at 25 mph. Wind gusts up to 40 mph, nickel-size hail, heavy downpours, and occasional cloud to ground lightning can be expected with this storm. This storm will be near... Tower around 800 PM CDT. Other locations impacted by this storm include Big Rice Lake, Wahlsten, and Soudan Underground Mine State Park. Seek shelter inside a sturdy building and away from windows until this storm passes. This storm may intensify, please monitor local media outlets for additional information and possible warnings from the National Weather Service. LAT...LON 4760 9249 4773 9258 4783 9226 4760 9218 TIME...MOT...LOC 0047Z 252DEG 24KT 4767 9240 JTS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
800 PM CDT MON JUL 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0703 PM HAIL CHISHOLM 47.49N 92.88W
07/17/2017 M0.75 INCH ST. LOUIS MN PUBLIC
DIME SIZE HAIL IN TOWN.
&&
BJHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
802 PM CDT MON JUL 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0758 PM HAIL EMBARRASS 47.66N 92.20W
07/17/2017 M0.25 INCH ST. LOUIS MN TRAINED SPOTTER
JUST STARTING ALONG WITH RAINFALL.
&&
BJHSpecial Weather Statement
National Weather Service Duluth MN
802 PM CDT MON JUL 17 2017
MNZ019-180130-
Central St. Louis-
802 PM CDT MON JUL 17 2017
...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL ST. LOUIS COUNTY...
At 802 PM CDT, a strong thunderstorm was near Whiteface Reservoir, or
34 miles northwest of Split Rock Lighthouse State Park, moving
southeast at 10 mph.
Wind gusts up to 40 mph, nickel-size hail, heavy downpours, and
frequent cloud to ground lightning can be expected with this storm.
This storm will be near...
Fairbanks and Wolf Lake around 830 PM CDT.
Other locations impacted by this storm include Bassett Lake.
Seek shelter inside a sturdy building and away from windows until
this storm passes.
This storm may intensify, please monitor local media outlets for
additional information and possible warnings from the National
Weather Service.
LAT...LON 4743 9179 4740 9179 4719 9193 4733 9223
4749 9212
TIME...MOT...LOC 0102Z 293DEG 9KT 4738 9208
JTSSpecial Weather Statement National Weather Service Duluth MN 810 PM CDT MON JUL 17 2017 MNZ019-180130- Central St. Louis- 810 PM CDT MON JUL 17 2017 ...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL ST. LOUIS COUNTY... At 809 PM CDT, a strong thunderstorm was over Embarrass, or 19 miles southeast of Lake Vermilion, moving east at 25 mph. Pea sized hail was reported in Embarrass at 809 PM CDT. Half-inch hail is possible with this storm. This storm will be near... Babbitt around 830 PM CDT. Other locations impacted by this storm include Bear Head Lake, Bear Head Lake State Park, Ridge, and Bear Island Lake. Seek shelter inside a sturdy building and away from windows until this storm passes. LAT...LON 4759 9222 4774 9228 4785 9191 4758 9182 TIME...MOT...LOC 0109Z 256DEG 23KT 4768 9214 JTS
The Duluth radar (KDLH), 99 km away, was scanning. The volume nearest the first event began at 01:27 UTC.
1 thunderstorm wind. Local standard time, as filed.
A tree that was blown down on County Road T blocked a lane of traffic between Oakland and Jackson townships.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2017Every state in 2017This day in weather historyWarnings in Wisconsin, July 2017
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: 712063.