Between 3 and 4 p.m. CDT on June 12, numerous supercell thunderstorms developed across Iowa, Illinois, Wisconsin, and Minnesota. These supercells resulted in seven of the 13 tornadoes that touched down that day. Five tornadoes were confirmed across Wright and Franklin counties in Iowa. One of the tornadoes was rated high-end EF3, destroying two houses and a restaurant. Other tornadoes were rated EF2, EF1, and EF0, with numerous farm buildings suffering major damage. Two other tornadoes – rated EF0 and EF2 – touched down in Jo Daviess and Carroll County, Illinois. One person was injured near Savanna.
June 12–13 derecho
The supercell activity in Iowa and Illinois congealed into a powerful squall line as the storms moved into Indiana later that night. The newly formed derecho began producing numerous reports of damaging winds in northern Indiana. As the storms reached the town of Wabash, an embedded downburst within the main line produced winds up to in the town. Farm structures were destroyed and trees were snapped and uprooted. The derecho continued into Ohio and produced widespread damaging winds across much of the state, along with several embedded tornadoes. Henry County, Ohio documented four separate touchdowns, and a total of nine tornadoes occurred in Ohio that night. The derecho continued eastward into the early morning hours of the 13th, through Pennsylvania, Virginia, West Virginia, Maryland, New Jersey, and Delaware, producing wind damage in each state before dissipating.
June 13 derecho
On the morning of the 13, another linear complex of severe storms developed along a line near the southern border of Ohio. The storms eventually strengthened into a powerful derecho and raced to the south and east. As the storms reached eastern Tennessee and Kentucky, hundreds of damaging wind reports began coming into the Storm Prediction Center. In the Atlanta area, the storms produced two embedded EF1 tornadoes that moved through several suburbs. One of the tornadoes struck Canton, Georgia and injured nine people. Fatalities and injuries occurred as a result of falling trees and power lines as the storms ripped through North Carolina and Virginia, along with numerous reports of damaging winds and power outages. The derecho downed numerous trees and damaged structures in West Virginia as well, with surveys indicating winds up to in some areas In Maryland, the derecho produced an unusually fast moving, long trackEF0 tornado that tracked through several northern DC suburbs, downing many trees, several of which landed on homes. Emdedded tornadoes also occurred in Tennessee, Virginia, and North Carolina. The derecho moved out over the Atlantic Ocean and dissipated later that evening. The SPC received a total of 794 damaging wind reports that day.
