A series of powerful storms across the US in mid-October are expected to result in hundreds of millions of dollars in insured losses, according to a catastrophe report from Aon.
The events tested the industry's capacity across multiple regions, compounding existing challenges in the property and flood insurance markets.
Multiple systems drive widespread claims
The weather systems, which began Oct. 10, brought flooding, wind damage and infrastructure disruption across the East Coast, Alaska, the Southwest and the West Coast.
A nor’easter from October 11 to 14 inundated parts of the Carolinas and New England, while Typhoon Halong battered Western Alaska, damaging homes, businesses, and public facilities.
Aon reported that more than 600 properties were damaged in Alaska alone, alongside widespread wind and flood losses in Arizona, New Mexico, and Colorado. Coastal communities in New Jersey and New York also sustained property and auto claims from flooding and downed trees.
The accumulation of these events is likely to put upward pressure on catastrophe loss ratios for both primary carriers and reinsurers, particularly as they occur late in the hurricane season and ahead of critical January 1 renewals.
Federal flood program faces funding strain
The timing of the storms coincided with the ongoing federal government shutdown, which has disrupted operations at the National Flood Insurance Program (NFIP). The program remains able to pay existing claims but cannot issue or renew policies until funding resumes.
This interruption could affect claim processing for insureds in flood-prone areas and may open opportunities for private flood insurers to expand market share. Analysts at AM Best have noted that private carriers gaining business during the shutdown could retain policyholders who prefer the flexibility of commercial coverage or simply choose not to revert to NFIP once the program reopens.
The mid-October storms add to what has already been a costly year for global insurers. Industry data showed that 2025 catastrophe losses are trending above the 10-year average, driven by a succession of convective storm outbreaks, hurricanes, and secondary perils across North America, Europe, and Asia-Pacific.
For US insurers, these latest weather systems underscore the increasing volatility of catastrophe exposure outside the traditional hurricane corridor. Analysts expect insurers to reassess aggregate exposures and pricing adequacy in regional property books, particularly for flood-prone and coastal zones where both public and private coverage gaps persist.
