Climate Change and Increasing Disasters

The data shows more FEMA declarations and more NOAA storm events recorded per decade since the 1980s, but this partly reflects better reporting, population growth into hazard-prone areas, and increased federal disaster program scope, not only increased physical event frequency. For specific hazard types, the scientific consensus is clearer: major hurricanes are intensifying (higher wind speeds, more rapid intensification), rainfall amounts during storms are increasing, and wildfire acreage has grown dramatically in the western US. Tornado frequency trends are less clear due to changing detection capabilities.

These can move in opposite directions. Even if extreme weather event frequency stays constant, damage grows when more people and more valuable property sit in hazard-exposed areas. The US coastal population has grown significantly since 1973, meaning the same hurricane that would have caused modest damage to a sparsely settled coastline in 1960 now hits densely developed barrier islands and coastal communities. Separating the "more events" signal from the "more exposure" signal requires careful analysis, FEMA data alone cannot make that distinction cleanly.

Wildfire acreage burned in the western US shows the clearest upward trend over the past four decades. NOAA and USFS data document roughly a doubling of annual acreage burned since the 1980s in western states, with multiple years exceeding 8-10 million acres nationally. The scientific attribution links this trend to longer fire seasons driven by drought, earlier snowmelt, and higher temperatures. Flood damage costs have also trended upward, though attributing this to more intense storms vs. more exposed development is methodologically difficult.

Yes significantly. FEMA disaster funding has grown from hundreds of millions annually in the 1980s to tens of billions in high-disaster years. The Disaster Relief Fund (DRF), FEMA's primary funding mechanism, has required multiple emergency supplemental appropriations from Congress in recent decades. Years with major hurricanes (2004-2005 with Katrina/Rita/Wilma; 2012 with Sandy; 2017 with Harvey/Irma/Maria; 2022 with Ian) produce catastrophic single-year costs. This growing fiscal burden is one reason FEMA has expanded mitigation programs, preventing damage is cheaper than funding recovery.

Yes. The western US has seen dramatic increases in wildfire-related declarations and worsening drought conditions. The Gulf Coast and Atlantic Southeast continue to face high hurricane and flooding risk. The Northeast has experienced increasing flooding events including unusual events like post-tropical flooding. Meanwhile, some hazard types show geographic shift, the "Dixie Alley" tornado corridor in the Deep South has seen increasing tornado activity relative to the traditional Great Plains Tornado Alley in some studies.

NOAA's National Centers for Environmental Information (NCEI) publishes the Billion-Dollar Weather and Climate Disasters database (ncei.noaa.gov), updated annually, which tracks major US disaster events by cost and type going back to 1980. This is the most widely cited source for disaster cost trends. FEMA OpenFEMA provides the full declaration database. The EPA Climate Indicators report tracks extreme weather trends. PlainHazard provides state and county profiles based on these federal data sources.