The Future of Hurricanes | weatherology°
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By: Meteorologist Michael Karow
Updated: Jun 24th 2024

The Future of Hurricanes

For this 2024 Atlantic hurricane season, which started on June 1st, the National Oceanic and Atmospheric Administration (NOAA) is predicting an above-average number of named storms, with their projection sitting at 17-25 tropical storms or hurricanes. The average number is 10 per season for the Atlantic basin. This predicted above-average season comes after a 2023 Atlantic hurricane season which brought 20 named storms, making it the fourth most active on record. Is this a trend we can expect to continue in the future, especially with average global ocean temperatures on the rise? According to a 2020 study from researchers at NOAA, the global average of tropical cyclones is actually projected to decrease through the end of this century.

As global sea surface temperatures continue to rise, the fuel source for tropical cyclones, the water vapor that evaporates off the warming ocean surface, is expected to become richer. However, an increase in greenhouse gases is also warming the upper atmosphere, at the same time that the sea surface is warming. This tends to create a more stable atmosphere, less conducive to tropical cyclone formation. According to the climate models used by the team from NOAA, this stabilizing influence of increasing levels of greenhouse gases on the atmosphere, as a whole, will result in a decrease in the average number of tropical cyclones from today's 86 per year, globally, to 69 per year by 2100.

Even though the concentration of greenhouse gases has been on the rise, the levels of particulate pollution and aerosols have been decreasing, owing to pollution control measures. This makes the atmosphere clearer and blocks less of the incoming sunlight, allowing more of it to reach the ocean surface, increasing ocean warming, and creating a more favorable tropical cyclone environment. This effect has been most pronounced over the North Atlantic where, since 1980, the NOAA team found the greatest increase in the number of tropical cyclones. Again, though, this trend for the North Atlantic is expected to reverse later this century due to the aforementioned stabilizing influence of increasing greenhouse gases.

tropical cyclone hurricane
According to a 2020 NOAA-led study, the global average of tropical cyclones is projected to decrease through the end of this century
pollution smoke
Levels of particulate pollution and aerosols have been decreasing in recent decades making the atmosphere clearer, which lets more sunlight reach the ocean surface, thereby increasing ocean warming