Climate Change Raises Hurricane Risks in Multiple Ways

Climate change is pushing the atmosphere to a higher-energy state, setting the stage for more destructive Atlantic hurricanes. The resulting risks to coastal communities, economies, and governments are extraordinarily high.

A 2025 study, which has not yet undergone peer review, calculated the financial peril. Titled Stress testing insurance market stability under climate risk, it found about a 4% annual chance that an extreme hurricane season in Florida could cause multi-billion-dollar losses exceeding 1% of the state's GDP. Over a decade, that risk climbs to 34%. Such an event could trigger a regional collapse of the coastal property market. Science writer Eugene Linden warned in 2023 that a housing crisis can quickly morph into a systemic financial crisis.

Shifts in Climate Patterns

The El Niño-Southern Oscillation (ENSO) heavily influences hurricane activity. Historically, more than twice as many U.S. Landfalling hurricanes occur during La Niña events than during El Niño. While most climate models forecast a more El Niño-like future climate, which would reduce hurricane damage, the opposite trend has been observed recently. Climate change may be responsible, potentially locking in or intensifying a La Niña-like state.

More Powerful Storms

A 2020 review paper by 11 hurricane scientists summarized projections for storms under 2 degrees Celsius of global warming. The median forecast from 52 studies was for a 3% increase in peak wind speeds. However, 5% of studies predicted increases exceeding 6%. According to NOAA, a 3% wind increase leads to roughly 30% more damage, while a 6% increase doubles the damage.

The same paper reviewed rainfall projections from 44 models. The median predicted increase in tropical cyclone rainfall rate was 17%, but about 5% of studies forecast increases of 22% or more.

Slower, Wetter, and Higher Seas

An increase in slow-moving, stalled, and slow-to-weaken Atlantic storms in recent decades. If this trend is linked to climate change, it could bring significantly more flooding rainfall in the future.

Sea level rise will amplify storm surge damage. A 2022 NOAA report projects the following rise for 2020-2050:

There is a 50% chance U.S. Coastal sea level rise will exceed 0.7 meters by 2100. Under high-emissions scenarios with high climate sensitivity, rise could reach 2.2 meters by 2100 and 3.9 meters by 2150.

Other Potential Amplifiers

The Madden-Julian Oscillation, a tropical weather pattern, can boost hurricane activity during its favorable phases. Its response to warming is uncertain, but one 2015 paper predicted its amplitude could increase by 30% under extreme warming, potentially providing a major boost to hurricanes.

The Central American Gyre, a monsoon low, can spawn tropical cyclones. A warmer, moister atmosphere may lead gyre events to produce more rainfall. However, climate projections disagree on future changes to related weather patterns, leaving the future incidence of gyre-spawned hurricanes unknown.

Longer Seasons and Larger Storms

The Atlantic hurricane season has lengthened significantly, correlating with warmer sea temperatures. Compared to 1970-1994, the median season from 1995-2022 was 48 days longer. A 2024 paper predicts that under extreme warming, the season's end could be extended by 24 days by 2100, with more storms forming from late October through early December. This increases the window for hybrid superstorms like Hurricane Sandy, which occur when hurricanes merge with late-season extratropical systems.

Research also indicates a considerable jump in the size of the largest hurricanes compared to a pre-industrial climate, greatly increasing storm surge risk for cities like New York. What was once a one-in-500-year storm surge flood is now a one-in-24-year event, though future climate models generally do not show hurricanes increasing in size further.