Preliminary estimates suggest that combined economic and insured losses from severe convective storms (SCS) in the United States between June 18 and 25, 2026, could reach billions of dollars, according to brokerage group Aon’s weekly Cat Report.
From June 18 to 25, severe weather affected parts of the Gulf Coast, central United States, and High Plains. The most severely affected areas were concentrated in southeastern Louisiana, southern Mississippi, the central Plains, and the Midwest.
Severe weather events included deadly tornadoes in Kansas and Illinois, and a long-range derecho from Kansas to Oklahoma and Arkansas.
Another key factor in this severe weather was the remnants of Tropical Storm Arthur, which triggered a regional tornado outbreak in Louisiana and Mississippi with many weak to moderate tornadoes, followed by a tornado on June 21-23 with stronger tornadoes and a long-range derecho from Kansas to Oklahoma and Arkansas.
Aon noted that the 14 tornadoes in southeastern Louisiana and southern Mississippi were all rated EF0 or EF1. The strongest winds were in St. Tammany Parish and Hancock County, Louisiana, with wind speeds as high as 105 mph (170 km/h).
Reports from re/insurance brokers explained that additional localized wind damage in northern Illinois and northwestern Indiana, as well as severe hail in Fort Morgan, Colorado, caused significant impacts to homes, businesses and infrastructure.
While no fatalities were reported, two people were injured in Jefferson Parish. The worst affected areas were residential areas, with some houses having partial roof damage, collapsed walls, damaged garages and extensive damage to trees reported.
Between June 21 and 23, severe weather and tornadoes broke out in parts of Kansas, Illinois, and Indiana respectively. Separate incidents involving mobile homes killed at least two people and damaged at least 20 homes in rural Jefferson County, Illinois, about 90 miles (145 kilometers) southeast of St. Louis.
In Sedgwick County, Kansas, an EF2 tornado blew a mobile home off its foundation, killing one person. Aon’s report explains that tornadoes also tore through southern Indiana, damaging about 30 homes in Gibson County.
On June 22, derecho, which developed in northwest Kansas and moved into Oklahoma and central Arkansas, damaged six homes in El Reno, Oklahoma, and derailed a BNSF train in Woodward County.
Additional severe storms brought localized wind damage on June 24 and 25, including brief tornadoes in northern Illinois and damaging hail in eastern Colorado. Concentrations of straight-line wind damage were reported in and around Streamwood, Bartlett, and Hanover Park, Illinois, and in and around Griffith and Merrillville, Indiana.
At least one brief tornado was observed near Huntley, Illinois, and video captured debris flying and spinning beneath a narrow funnel, the report said.
Further west, hail damaged multiple homes, vehicles and public property in Fort Morgan, Colorado. In Riverside Park, hailstones the size of baseballs shattered windows at the Fort Morgan City Parks Department building.
“The main loss drivers between June 18 and 25 were severe weather events on June 21 and 23, including deadly tornadoes in Kansas and Illinois and a long-range derecho from Kansas to Oklahoma and Arkansas, and tropical winds on June 18 and 19 related to Louisiana and Mississippi An outbreak of tornadoes related to the remnants of Storm Arthur. Additional localized wind damage in northern Illinois and northwestern Indiana and significant hail damage in Fort Morgan, Colorado, further impacted homes, businesses, and infrastructure in the affected areas, and preliminary estimates indicate that economic and insured losses from these events could reach billions of dollars.”
