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Category '6' tropical cyclone hot spots are growing
https://news.agu.org/press-release/category-6-tropical-cyclone-hot-spots-are-growing/Climate change is making massive hurricanes and typhoons more likely in the western Pacific, North Atlantic and Gulf
16 December 2025
AGU press contact:
Liza Lester, news@agu.org (UTC-5 hours)
Researcher contact:
I-I Lin, iilin@ntu.edu.tw (UTC+8 hours)
NEW ORLEANS — The oceanic conditions that churn up the very strongest of hurricanes and typhoons are heating up in the North Atlantic and Western Pacific, fueled by warm water that extends well below the surface. Human-caused climate change may be responsible for up to 70% of the growth of storm-brewing hotspots there, according to new research.
…
Category 6 tropical cyclones would include those that exceed a wind intensity of 160 knots, Lin and her colleagues argue. Previously, any storm with winds above 137 knots were considered Category 5—most official weather agencies still recognize Category 5 tropical cyclones as the strongest. But since most other categories include a window of about 20 knots, Lin said it makes sense to create a Category 6. Category 4, for example, includes storms with wind intensity of 114-137 knots.
Some of the best-known of these storms include Hurricane Wilma in 2005, the most intense hurricane recorded in the Atlantic basin, Typhoon Haiyan and Typhoon Hagibis, which struck Tokyo in 2019. The latter was among the costliest in terms of destruction from rain and wind, Lin said, even though it had downgraded in intensity by the time it hit the Japanese capital. Finally, Hurricane Patricia, which formed in the Pacific Ocean off the coast of Mexico, was the strongest tropical cyclone ever recorded, with wind intensity of up to 185 knots—enough to make it considered a Category 7 storm, if such a thing existed, Lin said. “Patricia was the king of the world,” she added.
Burgeoning ocean hotspots feed big storms
Lin and her colleagues looked back at all large storms recorded in the past four decades or so, and found that these Category ‘6’ storms are increasingly common. In three decades from 1982 to 2011, there were eight tropical cyclones that had wind intensity of more than 160 knots. In the more recent decade she examined, from 2013 to 2023, there were 10 Category 6 tropical cyclones. So, of 18 Category ‘6’ cyclones that occurred the past 40 years or so, 10 of them happened in the last decade.
…
16 December 2025
AGU press contact:
Liza Lester, news@agu.org (UTC-5 hours)
Researcher contact:
I-I Lin, iilin@ntu.edu.tw (UTC+8 hours)
NEW ORLEANS — The oceanic conditions that churn up the very strongest of hurricanes and typhoons are heating up in the North Atlantic and Western Pacific, fueled by warm water that extends well below the surface. Human-caused climate change may be responsible for up to 70% of the growth of storm-brewing hotspots there, according to new research.
…
Category 6 tropical cyclones would include those that exceed a wind intensity of 160 knots, Lin and her colleagues argue. Previously, any storm with winds above 137 knots were considered Category 5—most official weather agencies still recognize Category 5 tropical cyclones as the strongest. But since most other categories include a window of about 20 knots, Lin said it makes sense to create a Category 6. Category 4, for example, includes storms with wind intensity of 114-137 knots.
Some of the best-known of these storms include Hurricane Wilma in 2005, the most intense hurricane recorded in the Atlantic basin, Typhoon Haiyan and Typhoon Hagibis, which struck Tokyo in 2019. The latter was among the costliest in terms of destruction from rain and wind, Lin said, even though it had downgraded in intensity by the time it hit the Japanese capital. Finally, Hurricane Patricia, which formed in the Pacific Ocean off the coast of Mexico, was the strongest tropical cyclone ever recorded, with wind intensity of up to 185 knots—enough to make it considered a Category 7 storm, if such a thing existed, Lin said. “Patricia was the king of the world,” she added.
Burgeoning ocean hotspots feed big storms
Lin and her colleagues looked back at all large storms recorded in the past four decades or so, and found that these Category ‘6’ storms are increasingly common. In three decades from 1982 to 2011, there were eight tropical cyclones that had wind intensity of more than 160 knots. In the more recent decade she examined, from 2013 to 2023, there were 10 Category 6 tropical cyclones. So, of 18 Category ‘6’ cyclones that occurred the past 40 years or so, 10 of them happened in the last decade.
…