Heat Advisories issued by 16 National Weather Service (NWS) forecast offices cover portions of 12 U.S. states from September 14 through September 16, 2026, with heat index values forecast to reach 46°C (114°F) in southern Texas. The advisories extend from Texas and Oklahoma through the Lower Mississippi Valley and Mid-South into Indiana and Kentucky.
Heat Advisories covered a broad corridor from the southern Plains and lower Mississippi Valley through the Midwest, Ohio Valley and parts of the Mid-Atlantic on September 1, 2026. National Weather Service (NWS) offices forecast heat indices from around 37.2°C (99°F) to 43°C (110°F), with several multi-day products citing limited overnight relief as a factor in maintaining the advisories.
At least six tornadoes were confirmed after a preliminary derecho swept from eastern Iowa through northern Illinois and into northern Indiana on August 11, 2026. Three EF1 tornadoes were confirmed in Delaware County, Iowa, while three additional tornadoes produced preliminary EF1-level damage in the Chicago area, with two continuing into Lake County, Indiana. The derecho produced a maximum measured gust of 160 km/h (99 mph) at Gary, Indiana.
At least two people died and more than 800 000 utility customers across Illinois, Indiana, Ohio and Kentucky were without power at 00:00 EDT on August 12 (04:00 UTC on August 12) after severe storms swept the Midwest and Ohio Valley on August 11, 2026. Sixteen incarcerated people were transported to hospitals for treatment after a reported lightning strike at an Ohio correctional facility. At least six tornadoes were confirmed in association with a system that the Storm Prediction Center preliminarily classified as a derecho, while additional rounds of storms brought destructive winds and flooding to Ohio.
The Storm Prediction Center (SPC) issued an Enhanced Risk of severe thunderstorms from northern Illinois into the Ohio Valley for August 11, 2026, with damaging winds the primary threat. A potentially organized mesoscale convective system moving southeast from Iowa could produce a swath of damaging gusts, including some above 120 km/h (75 mph), if it remains well organized.
Cook County issued a disaster proclamation after severe storms caused flash flooding, structural damage, transportation disruption and extensive utility outages
Extreme Heat Warnings, Extreme Heat Watches, and Heat Advisories are in effect across 31 U.S. states after the National Weather Service (NWS) issued a series of heat alerts on June 29, 2026. Peak heat index values are forecast to reach 46°C (115°F), with dangerous heat and humidity expected to persist into early July across parts of the Midwest, Northeast, Southeast, and central United States.
Heat Advisories and Extreme Heat Watches have been issued across parts of Illinois, Missouri, Kansas, Iowa, Nebraska and South Dakota ahead of intensifying heatwave beginning Sunday, June 28, 2026. Heat index values are forecast to exceed 38°C (100°F) across much of the region, with some areas expected to reach 41 to 43°C (105 to 110°F) through Tuesday or Thursday, depending on location.
At least two women were reported dead after a tornado touched down in Mount Vernon in northeastern Jefferson County on June 21, 2026.
A tornado damaged the Park Place Apartments retirement community in Newburgh, Indiana, on June 21, 2026, as severe weather moved across portions of Illinois and Indiana.Among the hardest-hit locations was Newburgh, Indiana, where a tornado damaged part of a retirement community. The Storm Prediction Center received 37 tornado reports during the outbreak, while emergency crews responded to structural damage, downed trees, and transportation disruptions.
