pair of twin tornadoes (EF1 and EF3) near St. Anne, Illinois, destroyed many homes and mobile homes, snapped trees, demolished barns and farm equipment, and injured one person. Several more tornado warnings were issued in Southern Michigan that night, and into the early morning. Counties under warnings included Calhoun, Kalamazoo, Hillsdale, Jackson, Branch, Berrien, Van Buren, Saint Joseph, Washtenaw, Wayne, and Monroe counties. An EF1 tornado in Calhoun County touched down just south of Battle Creek, downing trees and tearing the roof off of a church. Other damage reported in Calhoun County included a flagpole bent at a right angle due to extreme winds in Homer. A damaging EF2 tornado struck the town of Dundee, Michigan, where multiple businesses and a water park were damaged and 11 people were injured. Throughout the town, many trees were downed and homes were damaged or destroyed. A state of emergency was also declared for the town of Leamington, Ontario, after extensive damage was reported across the southern part of Essex County, Ontario, due to an F1 or possible F2 tornado confirmed by Environment Canada. Seven people were confirmed dead in Wood County, Ohio, just outside Toledo after an EF4 tornado hit the town of Millbury, Ohio, in the middle of the night. June 16–17 An intense low pressure system developed across the northern Plains states and impacted the region on June 16–17. Eighty-two tornadoes touched down over the two days, primarily across North Dakota and Minnesota on June 17. Significant damage was reported west of Grand Forks, North Dakota, and in the Wadena, Minnesota, area, and a tornado emergency was issued for areas north of Wadena and again later for areas near Plummer, Minnesota, where significant damage was reported. Much of Wadena was destroyed by its tornado. Three people were killed; one in Almora, Minnesota, one in Mentor, Minnesota; and a third in Freeborn County, Minnesota. At least four of the tornadoes were rated EF4, the most violent tornadoes in a single event since February 5–6, 2008. This outbreak spawned a record 48 tornadoes in Minnesota on June 17, breaking the state's previous single-day record of 27 tornadoes set during the Mid-June 1992 tornado outbreak. June 20–21 An unsettled pattern continued across a large part of the US, with widespread isolated tornadoes across various parts of the Plain states. The most notable tornado touched down in Billings, Montana, at the MetraPark trade facility.