Severe Thunderstorms Outpace Hurricanes in 2025 Economic Damage, Fueled by Climate Change

Severe convective storms, a meteorological phenomenon characterized by the rapid upward movement of warm, moist air, inflicted an estimated $82 billion in global economic losses in 2025. This substantial figure represents nearly one-third of all natural catastrophe losses worldwide for that year, a significant shift that saw these storms surpass tropical cyclones in financial impact for the first time in decades. The United States bore the brunt of these losses, accounting for nearly three-quarters of the global total. A new report from First Street, a prominent climate science research firm, highlights that while events like hurricanes and earthquakes often dominate public attention and disaster preparedness efforts, severe convective storms are inflicting a continuous and cumulative economic toll. This escalating damage is a significant contributing factor to the rising costs of property insurance. Further underscoring this trend, a research report from Aon, a global leader in risk management, indicates that material losses specifically attributed to severe convective storms have surged at an annual rate of 6.8%. This growth rate significantly outpaces the 2.7% annual increase observed in overall weather-related losses since the year 2000. Over the past quarter-century, severe convective storms have been responsible for an accumulated total of approximately $794 billion in insurance claims. This figure is notably larger than the combined claims generated by other major natural perils such as flooding, droughts, and earthquakes. Despite this significant and growing financial burden, Jeremy Porter, Ph.D., Chief Economist at First Street, observed during a recent webinar that the financial reserves being established to address severe convective storm losses are not as robust as those allocated for primary perils like wind, flood, and fire. The increasing severity and frequency of these storms are intrinsically linked to the ongoing effects of climate change. As global temperatures continue to rise, the Earth's atmosphere gains the capacity to hold more moisture. Ed Kearns, First Street’s Chief Science Officer, explained this phenomenon by stating that for every degree Celsius increase in atmospheric temperature, the air can retain an additional 7% of water vapor. This amplified water vapor content serves as a crucial energy source for the development and intensification of severe convective storms. Kearns elaborated that a warmer climate directly translates to more water vapor in the atmosphere, which in turn fuels these powerful storm systems, leading to more frequent and intense events, including an increase in severe storms and tornadoes.