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This page lists the 74 tornadoes that occurred in the 17 June 2010 Tornado Outbreak, by supercell. Radar images, damage photos, and descriptions have been included when available, particularly for the strongest tornadoes. Here are some quick stats on the tornado outbreak:

By EF-Rating
33 EF0 26 EF1 7 EF2 4 EF3 4 EF4

By State
State Tornadoes EF2-EF4 Tornadoes
North Dakota 22 4
Minnesota 48 11
Wisconsin 3 1
Iowa 3 0

Please note that some of the tornadoes crossed state borders and therefore the sum of the middle column in the above table will not equal the 74 tornadoes that occurred in this outbreak.

 

Tornadoes

Jump to one of the EF3 or EF4 Tornadoes
Almora-Bluffton EF4 Holmes, ND EF4 Wadena, MN EF4 Conger, MN EF4
Mentor, MN EF3 Ellendale, MN EF3 Hollandale, MN EF3 Blooming Prairie EF3

Note that supercell "E" and "F" have been skipped, to avoid confusion with EF-ratings of individual tornadoes spawned by that particular storm.

To search for official Storm Data records on these tornadoes, and other severe weather, you can always refer to the NCDC Web Site.

 

Left: a labeled map of the supercell tracks for reference while using this web page. Right: a graph of tornadoes that occurred in Minnesota on June 17th plotted against time. This graph shows that at almost every minute between 2:30pm and 8:00pm there was a tornado on the ground in Minnesota.

The path lengths listed below are in miles, and the path widths are listed in yards. Times are all in Central Daylight Time (CDT).

Supercell A
ID: Location: Time: Path Length: Max Width: Rating:
A1 3.3 ESE Bejou, MN to 6.0 WSW Fosston, MN 4:00-4:10pm 6.0 40 EF0
A2 3.6 SSE Goodridge, MN to 1.0 SE Goodridge, MN 5:07-5:10pm 2.0 30 EF1
A3 7.6 ENE Gatzke, MN to 1.0 E Skime, MN 5:44-5:51pm 4.0 40 EF1

This supercell produced three tornadoes as it tracked from near Wheaton, MN (1:38pm) into western Ontario (7:01pm). The three tornadoes occurred mid way through its life cycle. None of the tornadoes led to any injuries or fatalities, and all of the tornadoes occurred in the NWS Grand Forks county warning area. Tornado A1 occurred in Mahnomen and Polk Counties, A2 in Pennington County, and A3 in Marshall and Roseau Counties.

Supercell AA
ID: Location: Time: Path Length: Max Width: Rating:
AA1 1.2 SW Fossum, MN to 4.0 ESE Twin Valley, MN 3:28-3:30pm 1.0 25 EF0

This supercell was a left split storm of supercell A, and only produced one brief tornado in Norman County, Minnesota, in the NWS Grand Forks county warning area. Given the radar signature, and the left-split nature of the storm, this tornado was probably anticyclonic.

Supercell B
ID: Location: Time: Path Length: Max Width: Rating:
B1 11.0 NNE Streeter, ND to 4.7 SE Medina, ND 2:55-3:03pm 2.8 25 EF0

Supercell B had a very short life span of less than 2 hours, and only produced one tornado in Stutsman County, North Dakota, in the NWS Bismarck county warning area. This was one of the first tornadoes of the outbreak.

Supercell C
ID: Location: Time: Path Length: Max Width: Rating:
C1 7.6 WSW Lake George, MN to 4.0 WNW Lake George 5:17-5:26pm 6.0 80 EF1

Storm C produced one tornado as it moved from near Appleton, MN (1:52pm) to north of Bemidji, MN (5:56pm). The tornado occurred in Hubbard County, Minnesota, which is in the eastern portion of the NWS Grand Forks county warning area.

Supercell D
ID: Location: Time: Path Length: Max Width: Rating:
D1 2.0 NE Pingree, ND to 2.4 NE Pingree, ND 3:44-3:47pm 0.4 25 EF0

Supercell D also produced one tornado in Stutsman County, North Dakota, which is in the NWS Bismarck county warning area. This brief tornado was one of the earlier tornadoes in the outbreak.

Supercell G
ID: Location: Time: Path Length: Max Width: Rating:
G1 3.0 NNE Leaf Valley, MN to 10.0 N Bluffton, MN 3:43-4:45pm 39.3 2288 EF4
G2 2.1 SSW to 1.0 NW Kabekona Corner, MN 5:48-5:54pm 4.0 30 EF0
G3 4.9 WSW Benedict, MN to 4.0 SSW Laporte, MN 5:49-5:51pm 1.0 30 EF0

This supercell tracked from near Holloway, MN (2:25pm) to near Northome, MN (6:06pm), and produced the first of four EF-4 tornadoes of this tornado outbreak. It also produced hail up to 4.25 inches in diameter.

Tornado G1 was a long-tracked, violent tornado. In fact, it had the longest track of any tornado in the outbreak. The path length was 39.3 miles long, crossing from Douglas County into Otter Tail County in Minnesota. The damage path was 1.3 miles wide at its widest point. The tornado destroyed numerous homes and farmsteads along its path, completely sweeping 7 homes from their foundations. At times, this multi-vortex tornado complex consisted of multiple tornadic tubes pivoting around a common center. Peak winds were estimated at 175 mph. Radar images above are from approximately 4:10pm from the Grand Forks radar. This tornado caused 1 fatality and 5 injuries.

The other two tornadoes spawned by this supercell were in Hubbard County, Minnesota.

Supercell H
ID: Location: Time: Path Length: Max Width: Rating:
H1 2.4 E Vergas, MN 3:55-3:55pm 0.2 15 EF0
H2 8.9 WSW Lake Itasca, MN to 8.0 S Zerkel, MN 4:32-4:34pm 1.0 40 EF1
H3 4.2 S Clearbrook, MN to 3.0 S Clearbrook, MN 5:29-5:31pm 1.0 40 EF1

Supercell H tracked from near Hoffman, MN (2:38pm) to near Little Rock, MN (6:01pm), producing three tornadoes. None of the tornadoes led to any injuries or fatalities, and all of the tornadoes occurred in the NWS Grand Forks county warning area. The first tornado occurred in Otter Tail County, and the other two occurred in Clearwater County.

Supercell I
ID: Location: Time: Path Length: Max Width: Rating:
I1 4.8 NNE Finley, ND to 9.0 NNE Finley, ND 3:38-3:45pm 4.3 30 EF0

Supercell I only had a life span of around an hour and a half and produced just one weak tornado in Steele County, North Dakota, in the NWS Grand Forks county warning area.

Supercell J
ID: Location: Time: Path Length: Max Width: Rating:
J1 2.5 SE Portland Jnctn, ND to 10.0 W Thompson, ND 3:49-4:18pm 17.0 150 EF4
J2 2.0 SW Ojata, ND to 1.0 E Mekinock, ND 4:31-4:42pm 7.0 100 EF2

This supercell tracked from near Arthur, ND (2:52pm) to near Grafton, ND (5:15pm), and produced two significant tornadoes in far eastern North Dakota - an EF-4 tornado and an EF-2 tornado.

   

Tornado J1 was a violent tornado, and one of four EF-4 tornadoes in this outbreak. The path length was 17.0 miles long, crossing from Traill County into Grand Forks County in North Dakota. It was a fairly narrow, but intense, tornado with a damage path width of only 150 yards. The "Holmes Tornado" had peak winds estimated to 185 mph. This tornado made its initial touchdown roughly 1 mile north of Mayville, ND around 3:49 pm, and produced a near continuous damage path through rural north-central Traill county into rural south-central Grand Forks county before lifting about 10 miles west of Thompson, ND around 4:18 pm. Damage was most extreme at a farmstead near Highway 15, where a home was completely swept from its foundation and destroyed. There were zero fatalities and one injury with this tornado. Radar images above are from approximately 4:01pm CDT.

Tornado J2 was a strong tornado with a path length of 7 miles and a path width of 100 yards that affected Grand Forks County near U.S. Highway 2. A pole barn and several farm outbuildings were destroyed. Large trees were snapped or uprooted. Debris was thrown near Emerado and just east of the Grand Forks Air Force Base. Peak winds were estimated at 120 mph.

Supercell K
ID: Location: Time: Path Length: Max Width: Rating:
K1 11.1 E Sheyenne, ND to 5.6 SW Tokio, ND 4:27-4:28pm 1.2 15 EF0

Supercell K was another short-lived tornado, with a life span of around an hour and a half. It produced just one weak tornado that crossed from Benson County into Eddy County in North Dakota, within the NWS Grand Forks county warning area.

Supercell L
ID: Location: Time: Path Length: Max Width: Rating:
L1 1.4 NNW Winsted Airport to 1.2 WNW Winsted, MN 5:23-5:26pm 0.8 25 EF0
L2 2.1 NE Buffalo, MN to 2.1 SSW Monticello, MN 6:00-6:06pm 5.1 50 EF1

This storm moved from about 13 miles northeast of Windom, MN (3:10pm) to near Bruno, MN (8:14pm), or from southwest Minnesota nearly to the western tip of Lake Superior. It produced two tornadoes in the central part of Minnesota. The first tornado occurred in McLeod County, and the second occurred in Wright County. Both of those tornadoes were in the NWS Chanhassen county warning area.

Supercell M
ID: Location: Time: Path Length: Max Width: Rating:
M1 5.5 N Berea, ND to 5.3 SE Rodgers, ND 4:01-4:03pm 1.0 100 EF1

Supercell M was another storm with a brief life span in North Dakota during this outbreak, but it produced one EF1 tornado in Barnes County. This tornado occurred in the NWS Grand Forks county warning area.

Supercell N
ID: Location: Time: Path Length: Max Width: Rating:
N1 12.0 S Bluffton, MN to 2.9 NNW Wrightstown, MN 4:48-4:50pm 1.5 40 EF1
N2 4.8 SSE Bluffton, MN to 7.0 NE Wadena, MN 4:59-5:16pm 10.0 1936 EF4
N3 1.5 SSW Nimrod, MN to 3.6 SSW Osnawa, MN 5:30-5:48pm 14.8 200 EF0

This supercell tracked from near Morris, MN (3:20pm) to near Longville, MN (6:15pm), and produced three tornadoes in the latter half of its life cycle. This includes the "Wadena Tornado" that struck the town of Wadena, MN.

Tornado N2 was the violent, EF4 "Wadena Tornado" that struck the town in Wadena County, Minnesota. This tornado was on the ground for approximately 10 miles and 17 minutes, with a max path width of 1.1 miles. This multi-vortex wedge tornado began in Otter Tail County about 3 miles southwest of the city of Wadena at 459 PM CDT. It tracked for about 2 miles in Otter Tail County, then it continued for another 8 miles in Wadena County.

The tornado ravaged the western half of the community of Wadena. Numerous homes were flattened to the ground and at least one was completely swept from its foundation and destroyed. Public and industrial buildings were wrecked, the fairgrounds were damaged, and headstones in the cemetery were overturned. School buses and vehicles were propelled through the air for hundreds of yards. The tornado hit on the day of the Wadena all-school reunion, so many additional people were in the area. This violent tornado led to 20 injuries. Roughly 100 people were displaced from their homes. Peak winds were estimated at 170 mph.

Supercell O
ID: Location: Time: Path Length: Max Width: Rating:
O1 1.6 WSW Dazey, ND 4:05-4:05pm 0.2 15 EF0
O2 2.0 WNW Dahlen, ND to 2.0 NNE Dahlen, ND 5:15-5:19pm 3.0 25 EF0
O3 3.1 SW Fordville Arpt, ND to 2.0 WNW Fordville 5:41-5:45pm 2.0 50 EF1

Supercell O tracked from near Litchville, ND (3:20pm) into southeast Manitoba (7:33pm), producing three tornadoes. None of the tornadoes led to any injuries or fatalities, and all of the tornadoes occurred in the NWS Grand Forks county warning area. The tornadoes occurred in Barnes, Nelson, and Walsh Counties chronologically.

Supercell P
ID: Location: Time: Path Length: Max Width: Rating:
P1 5.3 WNW Zerkel, MN to 6.6 NW Zerkel, MN 4:41-4:46pm 3.0 30 EF1

This storm occurred very briefly in northwest Minnesota, producing one weak tornado in Clearwater County. This one tornado was in the NWS Grand Forks county warning area.

Supercell Q
ID: Location: Time: Path Length: Max Width: Rating:
Q1 4.1 NW Elmore, MN to 3.1 SW Blue Earth Arpt 5:05-5:10pm 2.7 75 EF0

Supercell Q actually formed in far northern Iowa and then moved into southern Minnesota, producing a brief weak tornado in Faribault County, Minnesota. This tornado was in the NWS Chanhassen county warning area.

Supercell R
ID: Location: Time: Path Length: Max Width: Rating:
R1 0.5 E Colgate, ND to 3.0 NE Hope, ND 4:30-4:39pm 7.0 50 EF1
R2 5.5 ENE Hope, ND to 8.0 ENE Hope, ND 4:40-4:45pm 3.0 75 EF2
R3 6.2 S Northwood Arpt to 5.0 SSE Northwood, ND 5:02-5:05pm 2.0 50 EF0

This supercell storm produced three tornadoes, all in Steele County, North Dakota, in the NWS Grand Forks county warning area.

Tornado R2 was on the ground for approximately 5 minutes and 3 miles in the area east-northeast of Hope, ND. Numerous trees were severely damaged in shelterbelts. An abandoned farmhouse was collapsed and other farm buildings were damaged. The tornado was rated an EF2 on the Enhanced Fujita Scale. Peak winds were estimated at 125 mph.

Supercell S
ID: Location: Time: Path Length: Max Width: Rating:
S1 2.6 N to 2.7 N Clear Lake Airport, MN 5:54-5:55pm 0.1 10 EF0
S2 2.4 NNE to 4.8 N Clear Lake Airport, MN 5:56-5:59pm 2.5 30 EF0

Supercell S moved from near Fairfax, MN (3:52pm) to near McGrath, MN (7:24pm), or right across the central part of Minnesota. It produced two brief, weak tornadoes in Sherburne County, which in the NWS Chanhassen county warning area.

Supercell T
ID: Location: Time: Path Length: Max Width: Rating:
T1 1.6 WNW Grand Forks Airport to 1.0 W Manvel, ND 4:47-5:04pm 10.0 50 EF1
T2 4.4 NE Poland, ND to 1.5 E Big Woods, MN 5:21-5:29pm 5.0 50 EF1

This storm produced two tornadoes, both rated EF-1 on the Enhanced Fujita Scale, and both in the NWS Grand Forks county warning area. The first was in Grand Forks County, North Dakota and was on the ground for 10 miles. The second tornado touched down in Walsh County, North Dakota, crossed the Red River, and ended in Marshall County, Minnesota.

Supercell U
ID: Location: Time: Path Length: Max Width: Rating:
U1 2.4 WSW Hope, ND to 1.0 N Blabon, ND 4:28-4:38pm 7.0 75 EF2
U2 2.3 SE Orr, ND to 4.0 S Inkster, ND 5:22-5:24pm 1.0 25 EF0
U3 0.8 NNW Gilby, ND to 3.0 NNW Gilby, ND 5:37-5:40pm 2.0 25 EF0

This supercell storm produced three tornadoes as it moved from central into northeast North Dakota. All three tornadoes were in the NWS Grand Forks county warning area. The first tornado was in Steele County, and the other two were in Grand Forks County.

Tornado U1 was on the ground for approximately 10 minutes and 7 miles in Steele County. The tornado produced severe tree damage in field and farm shelterbelts located along its path. Rear flank downdraft winds also produced tree damage at the Hope golf course. The tornado was rated as an EF2 on the Enhanced Fujita Scale. Peak winds were estimated at 120 mph.

Supercell V
ID: Location: Time: Path Length: Max Width: Rating:
V1 0.9 ESE Gerled, IA to 1.3 E Gerled, IA 5:11-5:12pm 0.7 20 EF0
V2 2.4 NW Stevens, IA to 2.5 NNW Stevens, IA 5:24-5:25pm 0.7 20 EF0
V3 3.0 NE Elmore, MN to 3.6 SSW Marna, MN 5:40-5:44pm 1.7 20 EF0

Supercell V tracked from near Pocahontas, IA (4:06pm) to near Freeborn, MN (6:06pm), producing three brief, weak tornadoes near the Minnesota-Iowa border. The first two tornadoes occurred in Kossuth County, Iowa in the NWS Des Moines county warning area. The last tornado occurred in Faribault County, Minnesota in the NWS Chanhassen county warning area.

Supercell W
ID: Location: Time: Path Length: Max Width: Rating:
W1 2.0 NW St. Clair, MN to 1.1 NNW Mankato Springs 5:37-5:42pm 3.0 50 EF0

Supercell W barely lasted for more than an hour, and just produced one weak tornado in Blue Earth County, Minnesota, which is in the NWS Chanhassen county warning area.

Supercell X
ID: Location: Time: Path Length: Max Width: Rating:
X1 2.7 WSW Thompson, ND to 1.0 NW Merrifield, ND 5:30-5:43pm 8.0 30 EF0
X2 2.3 NW Freeman, MN to 9.0 N Fisher, MN 5:50-6:00pm 7.0 150 EF1
X3 0.8 NNE Angus, MN to 3.0 N Angus, MN 6:06-6:10pm 2.0 75 EF0
X4 2.9 NNW Radium, MN to 10.0 NNE Radium 6:26-6:36pm 7.0 200 EF1

Supercell X tracked from near Galesburg, ND (4:43pm) into southern Canada (8:07pm), or basically from far eastern North Dakota, through northwest Minnesota, and into Canada. This storm produced one tornado in Grand Forks County, North Dakota, before the storm crossed the Red River, and produced three more tornadoes in northwest Minnesota. The next two tornadoes occurred in Polk County, Minnesota, and the last tornado occurred in Marshall County, Minnesota. All four tornadoes were in the NWS Grand Forks county warning area.

Supercell Y
ID: Location: Time: Path Length: Max Width: Rating:
Y1 3.3 ENE Rake, IA to 4.8 ENE Rake, IA 6:05-6:06pm 1.5 30 EF0
Y2 4.7 SSW Bricelyn, MN to 3.9 SSW Bricelyn, MN 6:05-6:08pm 0.9 30 EF0
Y3 3.2 SSW Bricelyn, MN to 2.8 S Bricelyn, MN 6:10-6:11pm 0.4 30 EF0
Y4 1.4 SSW Kiester, MN to 0.4 NW Kiester, MN 6:13-6:18pm 1.5 50 EF2
Y5 0.2 WNW Kiester, MN to 2.6 NNE Kiester, MN 6:16-6:25pm 2.5 50 EF2
Y6 3.8 E Kiester, MN to 4.5 E Kiester, MN 6:23-6:25pm 0.7 50 EF0
Y7 2.6 SW Walters, MN to 1.2 WNW Mansfield, MN 6:28-6:31pm 0.6 50 EF1
Y8 1.1 WNW Mansfield, MN to 1.9 W Hartland, MN 6:33-7:15pm 20.0 1760 EF4
Y9 0.7 SSE Armstrong, MN to 1.0 E Armstrong, MN 6:50-6:54pm 1.1 100 EF1
Y10 2.9 WNW Albert Lea Airport to 2.5 S Lemond, MN 7:05-7:44pm 18.8 1320 EF3
Y11 0.5 SSE Clarks Grove, MN to 1.1 E River Point, MN 7:15-7:48pm 12.9 600 EF1

Supercell Y was by far the most prolific tornado-producing supercell of the entire outbreak, in terms of number of tornadoes. This supercell developed near Algona, IA (5:01pm) and tracked to near Owatonna, MN (8:19pm). It was cyclic in nature, meaning that individual circulations developed, matured, and then occluded, with the next area of circulation quickly developing as the old one dissipated. This resulted in numerous tornadoes in close proximity. The first tornado was a weak tornado in far northern Iowa (Winnebago County), in the NWS Des Moines county warning area. The remainder of the tornadoes were in far southern Minnesota, and occurred in Faribault, Freeborn, and Steele Counties. Those counties are in the NWS Chanhassen area of responsibility.

Tornado Y4 and Tornado Y5 were both EF2 tornadoes in the vicinity of Kiester, MN in Faribault County, Minnesota. Tornado Y4 formed south-southwest of Kiester based on a damage survey, plus photo and video evidence from storm chasers. It began near the intersection of 20th Street and 570th Avenue, then wrapped around another tornado (which developed about one mile west of Kiester) and dissipated. While southwest of Kiester, it did EF-2 damage to a couple farmsteads, including tree damage and destruction of several grain bins.

Tornado Y5 developed just west of Kiester, based on a damage survey, plus photo and video evidence from chasers. It struck the northwestern edge of Kiester, producing widespread tree damage and rated EF-1 at this point. It continued north as a multiple vortex tornado, doing EF-2 damage to a grove of trees. Farther north, several trees and grave stones were knocked over in a cemetery. It then turned and moved north-northeast before dissipating to the northeast of Kiester.

Tornado Y8 was a violent, long-tracked, EF4 tornado that impacted Freeborn County, Minnesota in the NWS Chanhassen county warning area. The tornado initially moved northeast to approximately 3.5 miles west of Conger, where at about (43.6156, -93.6015), it began to move more to the east-northeast. West of Armstrong, at about (43.6597, -93.4938), it began tracking nearly due north to just west of Manchester, where at about (43.7357, -93.4801), it began to move to the north-northwest, before dissipating 1.5 miles west of Hartland. Accounting for the changes in direction of this track, the actual path length covered by the tornado was 19.95 miles.

Near County Roads 17 and 63, the tornado intensified to produce EF-3 damage, impacting a farmstead and causing the complete destruction of three swine barns and the loss of 12 head of swine. Two empty grain bins were completely blown away at this location. This location also marked the beginning of crops being completely raked, with only stalks of corn left, and soybean fields being almost unrecognizable.

After passing through this farmstead the tornado took a more easterly path across County Road 63, and maintained EF-3 strength. After passing County Road 63, another farmstead was hit, and two empty harvester silos were toppled. The tornado continued to the northeast across County Road 4, where continued raking of the fields was noted with significant deposition of debris along the tornado path. The tornado continued to the north-northeast, grew to 1000 yards, and around 1750 LST impacted a farmstead along County Road 12 two miles north of Conger, where EF-4 damage was observed. The house at this location was completely destroyed, as was the barn and several other buildings. Extensive tree damage was noted with nearly all branches being removed from the trunks. Debarking of trees was widespread at this location. A car was also tumbled a distance of 3200 feet, coming to rest in a field east of County Road 12.

The tornado continued to the northeast across County Road 69 and County Road 46, where it weakened slightly to EF-3 intensity. As it crossed County Road 46, a house was rotated off the foundation. The tornado was approximately 700 yards wide at this point. To the north-northeast, a swine barn was destroyed with sheet metal being carried off to Interstate 90. The tornado continued to gradually weaken in intensity from that point. One person was killed and 14 injured from this tornado.

Tornado Y10 was the fourth strong to violent tornado produced by Supercell Y, and was on the ground for roughly 18.8 miles and 39 minutes. Touchdown was near the intersection of Freeborn County Roads 14 and 20. Multiple farmsteads experienced significant structural and tree damage, including one house completely destroyed and several others heavily damaged. Many outbuildings were destroyed, hundreds of trees uprooted and snapped, with some partially debarked. It then moved into Steele County, southwest of Ellendale, where it began moving to the north-northwest. At about (43.9255, -93.3453), it began moving toward the northwest, and at about (43.9407, -93.3627), it actually turned some more and moved toward the west-northwest until it finally dissipated. Accounting for the change in direction, the tornado had an actual path length of 7.7 miles in Steele County. Along the way, several homes experienced significant structural damage, with one house completely destroyed and the roof removed from two others. Many outbuildings were destroyed, and hundreds of trees were uprooted and snapped.

Supercell Z
ID: Location: Time: Path Length: Max Width: Rating:
Z1 1.0 NNE Haypoint, MN to 1.5 NE Haypoint, MN 8:05-8:06pm 0.7 25 EF0

Supercell Z lasted for a fairly long time (over 4 hours), tracking from near Alexandria, MN to near Virginia, MN. Despite that, it only produced one weak tornado in northern Aitkin County, which is in the NWS Duluth county warning area.

Supercell α
ID: Location: Time: Path Length: Max Width: Rating:
α1 0.8 SSW Orr, ND to 3.0 W Inkster, ND 5:45-5:52pm 4.0 75 EF1

Supercell α only lasted for approximately an hour, but produced an EF1 tornado in Grand Forks County, North Dakota, which is in the NWS Grand Forks county warning area.

Supercell β
ID: Location: Time: Path Length: Max Width: Rating:
β1 2.3 SW Gentilly, MN to 1.0 NW Gentilly, MN 6:00-6:04pm 3.0 150 EF1
β2 3.2 E Dorothy, MN to 5.0 ENE Dorothy, MN 6:16-6:19pm 2.0 50 EF1

This storm produced two tornadoes, both rated EF-1 on the Enhanced Fujita Scale, and both in the NWS Grand Forks county warning area. The first was in Polk County, Minnesota. The second tornado touched down in Red Lake County, Minnesota, and injured one person when it blew a parked semi-tractor rig off the highway.

Supercell θ
ID: Location: Time: Path Length: Max Width: Rating:
θ1 2.4 ENE Maple Bay, MN to 4.0 ENE Terrebonne, MN 6:15-6:36pm 15.0 150 EF3

This storm moved through northwest Minnesota and into far southern Canada over the course of approximately two and a half hours. It produced one tornado, an EF3 tornado that struck the Mentor, MN area.

Tornado θ1 was on the ground for about 21 minutes and 15 miles, and produced damage severe enough to be rated an EF3 on the Enhanced Fujita Scale. This tornado began in Polk County and tracked northeastward for nine miles to the Red Lake County line about 5 miles north-northeast of Mentor. After crossing into Red Lake County, it continued for an additional 6 miles. The tornado tracked across Maple Lake and the community of Mentor. Trees were sheared off or uprooted, power poles were snapped, and roofs and garages were destroyed. A convenience store and gas station along U. S. Highway 2 were flattened. Cabins, campers, boats, and docks were damaged along the northeast side of Maple Lake. The tornado sheared trees and blew down farm buildings near the Polk County line and lofted debris from Mentor well past the community of Plummer. Peak winds were estimated at 145 mph. One person was killed and two more were injured.

Supercell Δ
ID: Location: Time: Path Length: Max Width: Rating:
Δ1 1.9 SW Lerdal, MN to 1.2 SW Hollandale, MN 7:42-7:48pm 4.9 220 EF1
Δ2 1.2 SW Hollandale, MN to 2.3 W Newry, MN 7:47-7:59pm 5.0 600 EF3
Δ3 2.2 WSW Newry, MN to 1.8 NW Newry, MN 8:03-8:07pm 2.2 220 EF1
Δ4 3.0 WSW Blooming Prairie, MN to 2.8 SSE Bixby, MN 8:10-8:19pm 4.3 440 EF3
Δ5 2.0 NNW Blooming Prairie, MN to 5.7 WNW Hayfield 8:25-8:40pm 6.6 100 EF2
Δ6 2.0 NNE Blooming Prairie, MN to 5.5 S Clairmont, MN 8:27-8:35pm 5.5 50 EF0
Δ7 4.1 SSE Douglas, MN to 3.7 NNW Rochester, MN 9:03-9:10pm 2.4 150 EF1
Δ8 1.0 W Cream, WI to 1.3 E Cream, WI 9:57-10:01pm 2.3 25 EF1

Supercell Δ formed in north central Iowa and tracked northeast to the Rochester, MN area, by which time it had already begun to evolve from a supercell to a bowed line of storms. This line of storms then continued east-northeast into Wisconsin, producing an additional tornado in Buffalo County, Wisconsin. This supercell produced 8 tornadoes, the most of any supercell in the outbreak with the exception of Supercell Y.

Tornado Δ2 was an EF-3 tornado in Freeborn County, Minnesota that went on to obliterate a farmstead, with virtually every outbuilding destroyed, and the farm house leveled. It continued northeast and took the roof off a house and destroyed a greenhouse. Just before dissipating, it hit one more farmstead near County Roads 30 and 35, causing damage to outbuildings, minor damage to the house, and uprooting and breaking a couple dozen trees. The tornado was filmed by a storm chaser.

Tornado Δ4 developed just north of the Steele/Freeborn County line, shortly after the dissipation in Freeborn County of the Newry tornado. This new tornado moved northeast, and initially, occasional trees were broken. Damage intensified somewhat when it hit a farm on State Highway 30 just west of Blooming Prairie. The tornado continued moving northeast, decimating crops. Some bean fields were scoured in spots. It intensified significantly to EF-3 2.5 miles northwest of Blooming Prairie, where a house was leveled, trees were snapped, and large portions of bark were removed. A pickup truck was lofted about 50 feet into the basement of the house. Several other houses sustained minor damage. The tornado dissipated just west of Highway 218 and 123rd Street. This tornado was recorded on video by law enforcement and chasers.

Tornado Δ5 was an EF-2 tornado touched down and tracked east-northeast, and soon crossed the path of the Blooming Prairie EF-3 that had moved north-northeast about 10 minutes earlier. A manufactured home was obliterated by the EF-2. A woman inside the home was blown about 20 feet, but was found under debris, rescued by law enforcement, and survived. The tornado continued moving east-northeast, and several outbuildings were destroyed, along with many broken trees. The tornado continued into Dodge County. Most of the damage in Dodge County occurred near County Roads 3 and 4 where roofs were partially torn off buildings and trees were blown down.

Supercell ζ
ID: Location: Time: Path Length: Max Width: Rating:
ζ1 5.0 ENE Rush City, MN to 3.9 WNW Grantsburg, WI 8:44-9:05pm 7.8 400 EF2
ζ2 3.9 WNW Grantsburg, WI to 3.9 WNW Grantsburg Arpt 9:05-9:06pm 0.3 200 EF0

This storm produced two tornadoes near the St. Croix River, which marks the Wisconsin-Minnesota border. It moved from near Annandale, MN to near Minong, WI. The first tornado moved from Chisago County to Pine County in Minnesota, before crossing into Wisconsin and ending in extreme west Burnett County. The second tornado occurred near the end point of the first in Burnett County, Wisconsin. Both tornadoes occurred in the NWS Duluth county warning area, although the first tornado began in the NWS Chanhassen county warning area.

Tornado ζ1 was an EF2 tornado that crossed from Minnesota into Wisconsin. The tornado touched down in extreme northern Chisago County, uprooting trees and breaking large branches. The worst of the damage occurred in far southeast Pine County and was evidence of a strong EF2 tornado with estimated winds of 110-135 mph. This rating was based on the total destruction of a strapped down mobile home and the extensive uprooting/snapping of trees where the tornado crossed Minnesota State Highway 70. Two people in a mobile home were injured. Multiple homes sustained significant damage.

Non-Supercell Tornadoes
ID: Location: Time: Path Length: Max Width: Rating:
NS1 0.8 SW Hettinger, ND to 0.2 SSW Hettinger, ND 11:35-11:40am 0.6 20 EF1
NS2 4.2 W Larson, ND to 6.2 NW Larson, ND 2:31-2:40pm 3.5 25 EF0

Two tornadoes on June 17th were not associated with supercell thunderstorms. These tornadoes were brief and relatively weak, occurred in western North Dakota, and happened prior to the rest of the tornadoes in the outbreak. The first was in Adams County, North Dakota, and the second was in Burke County, North Dakota. Both were in the NWS Bismarck county warning area.


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