Thursday, September 10th, 2026 — In August 2020 a line of thunderstorms crossed Iowa moving at highway speed, with wind gusts estimated at up to 140 miles per hour around Cedar Rapids. It flattened grain bins, peeled roofs off apartment complexes, and damaged thousands of homes in a single afternoon. The derecho produced roughly $11 billion in damage, making it the costliest thunderstorm event in United States history, and it did so in a state whose catastrophe planning had been built around river flooding and the occasional tornado.
The adjusters who deployed to Cedar Rapids came from everywhere. Many had never worked a straight-line wind event of that scale. Some had never worked Iowa. They arrived with instincts built on Gulf Coast hurricanes and Front Range hail, and found a housing stock, a contractor market, and a set of local expectations that matched none of it. Most of them figured it out. The ones who did it fastest were the ones who understood, walking in, that their experience was a starting point and the map they were carrying was old.
What the numbers say
The industry’s data has been telling the same story for a decade, and it has been getting louder.
Severe convective storms, meaning tornadoes, hail, and straight-line wind, produced more than $50 billion in insured losses in the United States in 2023, the first time that peril crossed that line and a figure that exceeded the insured loss from hurricanes the same year. The 2023 total did not come from one catastrophic event. It came from dozens of storms in the $1 billion to $5 billion range, spread from Texas to Michigan to the Carolinas, in a pattern reinsurers have started describing as a frequency problem rather than a severity problem…