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How Climate Change Is Fueling Hurricanes Like Ida

Damage from Hurricane Ida on August 30, 2021 in Kenner, La. The storm was fueled by abnormally warm water in the Gulf of Mexico.
Image credit: Scott Olson

Ida was a fierce Category 4 storm when it came ashore in Louisiana on Sunday. With sustained winds of about 150 miles per hour, the hurricane ripped roofs off buildings and snapped power poles. The storm pushed a wall of water powerful enough to sweep homes off foundations and tear boats and barges from their moorings.

Climate change helped Ida rapidly gain strength right before it made landfall. In about 24 hours, it jumped from a Category 1 to a Category 4 storm as it moved over abnormally hot water in the Gulf of Mexico.

The ocean was the temperature of bath water — about 85 degrees Fahrenheit. That’s a few degrees hotter than average, according to measurements by the National Oceanic and Atmospheric Administration.

The extra heat acted as fuel for the storm. Heat is energy, and hurricanes with more energy have faster windspeeds and larger storm surges. As the Earth heats up, rapidly intensifying major hurricanes like Ida are more likely to occur, scientists say.

The trend is particularly apparent for storms in the Atlantic Ocean, which includes storms like Ida that travel over the warm, shallow water of the Caribbean sea. A 2019 study found that hurricanes that form in the Atlantic are more likely to get very powerful very quickly.

Residents along the Gulf Coast of the U.S. have been living with that climate reality for years. Hurricane Harvey in 2017, Hurricane Michael in 2018 and Hurricane Laura in 2020 all intensified rapidly before they made landfall. Now, Ida joins that list.

Hurricanes like Ida are extra dangerous because there’s less time for people to prepare. By the time the storm’s power is apparent, it can be too late to evacuate.

Abnormally hot water also increases flood risk from hurricanes. Hurricanes suck up moisture as they form over the water, and then dump that moisture as rain. The hotter the water — and the hotter the air — the more water vapor gets sucked up.

Even areas far from the coast are at risk from flooding. Forecasters are warning residents in Ida’s northeastward path to the Mid-Atlantic that they should prepare for dangerous amounts of rain. Parts of central Mississippi could receive up to a foot of rain on Monday.

Copyright 2021 NPR. To see more, visit https://www.npr.org.

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