The overall storm system driving the June 17–18 outbreak was unusually strong for June. NWS meteorologists noted the event was driven by an unseasonably deep upper low centered over northern Manitoba and Ontario. This synoptic pattern is more typical of April rather than June and resulted in unusually strong mid- and upper-level winds across the Northern Plains into the Midwest. The Storm Prediction Center issued a moderate risk for severe weather for portions of Illinois and Indiana on June 17, driven by a 15% probability of significant tornadoes.
An EF3 tornado in Effingham County, Illinois caused extensive structural damage and two injuries. An EF2 tornado also occurred near Mattoon, Illinois. A powerful tornado tore through Effingham County for more than 20 miles Wednesday evening, damaging buildings and lofting debris. CNN obtained footage showing a home completely swept off its foundation and dumped into the road. The Effingham Fire Department responded to “numerous storm-related emergencies” in Shumway and Sigel, including collapsed buildings, heavily damaged homes, motor vehicle crashes, and gas leaks. In one instance, the tornado lifted a vehicle off the ground and violently hurled it down a street. Radar imagery showed a debris signature extending roughly 20 miles northeast of the tornado’s track, suggesting pieces of homes, trees, and other materials were lofted well away from the hardest-hit areas. FOX Weather’s Debris Tracker showed debris carried as far as 21 miles from the tornado.
Multi-State Outbreak: Iowa, Indiana, Wisconsin & Beyond
An EF2 tornado impacted areas near Harpers Ferry, Iowa, and Boscobel, Wisconsin, tracking for 33 miles. A third EF2 struck Owen County and Monroe County, Indiana, tracking approximately 15 miles. An EF2 tornado with a path length of at least 15.35 miles and maximum width of 880 yards began near Spencer, Indiana, with peak winds of 130 mph (209 km/h), destroying a mobile home and several outbuildings. The morning storms produced a hurricane-force wind gust of 94 mph (151 km/h) near Albion, Iowa — approximately 50 miles northeast of Des Moines.
The storms brought hail bigger than baseballs and damaging wind gusts of nearly 80 mph (129 km/h). A BNSF freight train derailed near Monmouth, Illinois, Wednesday morning as the severe thunderstorms tracked through the area. The derailment appeared to be caused by powerful straight-line winds. Several tornadoes were reported along with widespread damaging wind gusts up to around 80 mph (129 km/h), wind-driven hail as large as 3 inches (7.6 cm) in diameter, and localized flash flooding.
The following day, June 18, tornadic supercells extending from the previous day’s storms continued to produce tornadoes, including an EF2 on the Indiana and Kentucky border. A large slight risk of severe weather was outlined for large portions of the Northeastern United States as well as Mississippi, Louisiana, Alabama, and Florida. Tornadic supercells continuing from June 17 produced tornadoes, including an EF2 on the Indiana and Kentucky border. Overall, at least 31 additional tornadoes occurred on June 18.
Power Outages & Scope of Damage
More than 130,000 homes and businesses were without power Thursday morning in Illinois, Indiana, Kentucky, and Ohio. Besides Indiana and Illinois, tornadoes were reported in Iowa, Kentucky, Ohio, and Wisconsin during the outbreak. As of Thursday afternoon, more than 82,000 customers were still without power in those states. Overall, at least 68 tornadoes occurred during this outbreak sequence.
First responders in Effingham received 14 calls involving homes, farms, or businesses with heavy damage or collapse. The Effingham County Emergency Management Agency said an impactful tornado traveled about 12–15 miles through the northern parts of the county, causing injuries, though none were considered serious. NWS survey teams were dispatched across all affected states to assess and rate tornado tracks, with final ratings still pending for some events.
very brief clip from the early stovepipe stages of the Effingham, Illinois tornado this evening – I have about 12 minutes of video from this tornado, from boring flat base to stovepipe to rope out! Can’t wait to post more soon pic.twitter.com/c1rSi4TVdp
— Michael Marz (@MichaelMarz1) June 18, 2026
Strong tornado impacts house near Montrose Illinois. Checked on injuries until EMS arrived. @ryanhallyall pic.twitter.com/yynHEkhLvT
— Adam Lucio 🌪️ (@AdamLucioWX) June 18, 2026
June 2026 had already been “off to an exceptionally violent, near-historic start across the United States.” Data from June 1–16 showed the nation was experiencing its second-fastest start for damaging straight-line wind reports since comprehensive record-keeping began in 1955. In Illinois alone, the preliminary tornado count for 2026 stood at 145 — nearly matching the state’s total for all of 2025, which itself was the highest count since 1950.
The outbreak concluded by Thursday morning, June 18. Survey teams continue to assess damage. Residents in affected counties in Illinois, Indiana, Iowa, Wisconsin, Kentucky, and Ohio are advised to use caution near downed power lines and structurally damaged buildings. Report any gas leaks immediately to local authorities, and do not re-enter storm-damaged structures without clearance.
