Midwest storms kill at least two as 99 mph winds trigger flooding and massive blackouts

A powerful derecho and accompanying thunderstorms have killed at least two people, knocked out electricity to more than 1 million homes and businesses at the peak of the storm and unleashed destructive winds and flash flooding across the U.S. Midwest and Ohio Valley. The August 11 storm system produced wind gusts reaching 99 mph in Gary, Indiana, damaged homes and utility infrastructure and generated tornadoes as it swept through parts of Illinois, Indiana and Ohio. By August 12, approximately 729,000 customers remained without electricity across the region, with Indiana suffering the largest concentration of outages. Additional thunderstorms and heavy rainfall remain possible through Thursday, raising concerns that already saturated communities could face another round of flooding before recovery operations are complete.

Among the confirmed fatalities was a 4-year-old boy in Geneva, Indiana, who died after a tree fell onto his home during the storm. In Ohio, another person died after floodwaters interfered with emergency responders attempting to reach a medical emergency. Authorities are separately investigating whether a deadly house explosion and fire in Portage, Indiana, was connected to the severe weather, meaning the storm’s eventual death toll could still change as officials complete their assessments.

The scale of the destruction reflects the combination of extreme straight-line winds and torrential rainfall rather than a single isolated tornado outbreak. A derecho is a long-lived thunderstorm complex capable of producing widespread wind damage over hundreds of miles, with destruction that can resemble the effects of tornadoes even when winds travel largely in one direction. The latest system left a broad corridor of fallen trees, damaged buildings, flooded roads and disabled electricity networks across several states.

Wind gusts approaching 100 mph turned the storm into a multistate infrastructure disaster

Northern Indiana experienced some of the most extreme winds, including a 99 mph gust recorded at Gary. The storm knocked down trees, utility poles and power lines across the region while damaging roofs, vehicles and other structures. Tornadoes were also reported around the Chicago area as the system moved east, although much of the widespread destruction was associated with the derecho’s powerful straight-line winds rather than individual tornado tracks.

The intensity of those winds helps explain the extraordinary number of power failures. Utilities must often replace broken poles and damaged distribution equipment rather than simply reconnecting lines after wind events of this magnitude, meaning restoration can take considerably longer than after an ordinary thunderstorm. Crews must also remove trees and confirm that damaged circuits are safe before electricity can be restored to neighborhoods.

Northern Indiana Public Service Co. was particularly affected, reporting approximately 273,900 customers without electricity at one stage. That represented around 59% of the utility’s roughly 468,000 customers, and the company warned that widespread damage to poles, wires and other infrastructure could require several days to repair fully.

The disruption extends beyond households because prolonged outages affect traffic signals, businesses, hospitals, communications systems and water infrastructure. Restoration efforts also become more difficult when storms continue moving through the same region because repair crews can be forced to suspend work whenever lightning or dangerous winds return.

A 4-year-old boy was killed as falling trees became one of the storm’s deadliest hazards

The death of the 4-year-old child in Geneva Township demonstrated how destructive straight-line winds can become even outside the path of a tornado. Authorities said a tree fell onto the home during the storm, killing the boy as severe winds moved through Indiana. Falling trees were reported throughout the affected region, crushing vehicles, blocking roads and bringing power lines down with them.

A second storm-related death occurred in Roseville, Ohio, where emergency crews responding to a medical emergency were delayed by floodwaters. The individual later died, illustrating how severe weather can cause fatalities indirectly by preventing ambulances and other responders from reaching people who need urgent assistance.

Authorities in Portage, Indiana, are also investigating a house explosion and fire that killed one person after the storms. Officials had not established whether the explosion was directly caused by storm damage, so the fatality should not yet be counted definitively as a weather-related death.

The distinction is important during fast-moving disasters because early casualty figures often change as medical examiners and emergency agencies determine exactly how deaths occurred. Storms can produce secondary hazards involving electrical systems, gas lines, fires and flooding long after the strongest winds have passed.

Ohio flooding forced hundreds of rescues as officials described historically severe conditions

Ohio faced a different but equally serious threat as intense rainfall overwhelmed streets, homes and drainage systems. Nearly 300 people reportedly called emergency services seeking help during the flooding, while water entered homes and left some neighborhoods difficult or impossible to reach by ordinary vehicles.

Gov. Mike DeWine mobilized the Ohio National Guard as officials confronted what they described as historically severe flooding in affected communities. Columbus also declared an emergency after high winds and torrential rainfall damaged infrastructure and disrupted transportation across the metropolitan area.

Flooding can remain dangerous after rainfall ends because rivers, streams and drainage systems continue responding to water that has already fallen upstream. Additional thunderstorms therefore pose an amplified risk when soils are saturated and waterways are already elevated, since relatively modest additional rainfall can produce new flash flooding much faster than it would under normal conditions.

The National Weather Service continued warning on August 12 that locally heavy rainfall and flooding would remain concerns as additional rounds of thunderstorms move through portions of the region. Some locations could experience repeated storms through Thursday and Friday, prolonging the threat even as communities begin cleaning up damage from the initial derecho.

Lightning strike at an Ohio prison sent 16 inmates to hospitals during the storm

The severe weather produced another unusual emergency at Grafton Correctional Institution in Ohio, where a lightning strike injured 16 inmates. One person was transported by helicopter for medical treatment, while the remaining injured inmates were taken to hospitals by other means. No deaths were reported from the lightning incident.

Lightning injuries are less visible than structural storm damage but can involve neurological, cardiac and muscular complications that require medical evaluation. The prison incident also underscores the difficulty institutions face during severe weather because moving large groups of people into protected spaces can require more planning than sheltering individual households.

Emergency managers typically advise people to move indoors whenever thunder can be heard because lightning can strike miles away from the heaviest rainfall. The danger can persist even after the strongest part of a thunderstorm appears to have moved away, particularly when large storm complexes produce frequent lightning across a broad region.

The combination of lightning, flooding, destructive winds and tornadoes made the August 11 system unusually disruptive because communities had to manage several hazards simultaneously. Emergency responders who might otherwise focus on fallen trees or damaged buildings were also required for water rescues, medical emergencies and widespread traffic disruption.

More than 700,000 customers remained without electricity as utilities warned repairs could take days

More than 1 million customers reportedly lost electricity at the peak of the storm, while approximately 729,000 homes and businesses across the Midwest remained without power during August 12. Indiana accounted for roughly 297,000 of those outages, equivalent to about 9% of electricity customers statewide.

Major utilities affected included operations connected with NiSource, Exelon, Duke Energy and American Electric Power. NIPSCO reported some of the most extensive damage, warning customers that restoration could take several days because crews were dealing with large numbers of fallen trees, broken poles and downed electrical lines across a wide geographic area.

Lengthy outages become increasingly disruptive during summer because homes can quickly become dangerously hot without air conditioning. Refrigerated food and medications can also become unusable, while people who depend on electrically powered medical devices may require access to emergency shelters or backup generation.

Utility crews must simultaneously restore critical infrastructure and avoid creating additional dangers. Downed lines can remain energized, which is why emergency officials repeatedly warn residents not to approach damaged electrical equipment even when a neighborhood appears otherwise safe after the storm.

Another round of thunderstorms could prolong flooding and delay Midwest recovery efforts

The immediate weather threat has not disappeared. Forecasts indicate that thunderstorms may continue across parts of the Midwest and Ohio Valley through Thursday, with damaging winds and locally heavy rainfall among the main hazards. National Weather Service outlooks also identify continuing flooding concerns where repeated storms move across already saturated areas.

That pattern creates a difficult recovery environment because utility crews, road departments and emergency responders need stretches of safer weather to remove trees and restore infrastructure. Additional heavy rainfall can reflood roads that have recently reopened, while fresh wind damage could increase the number of outages faster than crews can repair existing ones.

The economic impact will depend partly on how quickly power and transportation systems recover. Businesses unable to operate without electricity can lose several days of revenue, while damaged homes, vehicles and utility infrastructure will generate substantial insurance and repair costs across multiple states.

The human impact will continue even after the final weather warnings expire. Families whose homes were flooded or damaged by trees may require temporary housing, while communities facing multiday electricity outages will need cooling centers, charging facilities and assistance for medically vulnerable residents as restoration work continues.

Key takeaways from the deadly Midwest derecho, flooding and widespread power outages

• A powerful derecho and severe thunderstorm system swept across the Midwest and Ohio Valley, producing destructive winds, tornadoes, torrential rainfall and extensive flash flooding.
• More than 1 million homes and businesses lost electricity at the height of the storm, while approximately 729,000 customers were still without power during August 12.
• A 4-year-old boy in Geneva, Indiana, died after a tree fell onto his home during the severe winds.
• Another person died in Ohio after floodwaters prevented emergency responders from quickly reaching a medical emergency, while a third death following an Indiana house explosion remains under investigation.
• Wind gusts reached 99 mph in Gary, Indiana, while tornadoes and widespread straight-line wind damage were reported across portions of the region.
• Indiana experienced roughly 297,000 remaining electricity outages, while NIPSCO at one stage reported that approximately 59% of its customers had lost power.
• Ohio authorities dealt with widespread flash flooding and hundreds of calls for assistance, prompting emergency declarations and deployment of National Guard resources.
• Sixteen inmates at an Ohio correctional facility were hospitalized following a lightning strike, with one person transported by helicopter for treatment.
• Additional rounds of thunderstorms and locally heavy rainfall could continue through Thursday and Friday, creating renewed flooding risks and complicating restoration efforts.
• Utility companies warn that some electricity restoration could take several days because crews must replace damaged poles, clear fallen trees and repair widespread electrical infrastructure.