Tropical Storm Barry (2025) and climate change
How oceans warmed by climate change influenced this tropical cyclone
Climate change's effect on Tropical Storm Barry (2025)
Peak storm point
Barry at its peak
Tropical Storm
45 mph
How did climate change fuel Barry?
Human-caused carbon emissions trap heat in the atmosphere. The oceans have absorbed about 93% of that excess heat since 1970. This is due to their vast depth and area, and seawater's higher capacity for retaining heat compared to air.
Warmer oceans fuel more intense tropical cyclones by increasing wind speeds. Potential wind-related damages increase roughly four times with each storm category jump (1 to 5) according to NOAA. But even smaller increases in wind speed, without a category change, can dramatically increase potential damage.
Climate change is also contributing to sea level rise, which can amplify the storm surge potential when storms do occur, putting coastal residents at particular risk.
Finally, warmer air and oceans, driven by human-caused climate change, are leading to heavier tropical cyclone rainfall. These higher rainfall rates raise the risk of inland flooding, which has caused over half of hurricane-related deaths in the U.S.
Learn more about the science
The Climate Shift Index: Tropical Cyclones (Tropical Cyclone CSI) builds on the foundation of our Climate Shift Index: Ocean (Ocean CSI).
Ocean CSI is a peer-reviewed system developed by Climate Central to measure the fingerprint of climate change on ocean temperatures. It indicates how human-caused climate change — driven by humans burning fossil fuels and emitting aerosols — has influenced the likelihood of daily sea surface temperatures at nearly any location around the world's oceans.
As ocean temperatures warm in response to climate change, they provide fuel for tropical cyclones (including hurricanes), increasing their wind speeds. Tropical Cyclone CSI, also developed from peer-reviewed research, quantifies this effect by calculating the increase (or decrease) in a tropical cyclone's wind speeds due to those warmed ocean waters and tropical climate warming.
Have questions about how we quantify climate change's impact on hurricane intensity, and how you can incorporate this data into your work? Explore our frequently asked questions here, or you can contact our team below.
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