The Atlantic hurricane season has started on June 1, and the Gulf of Mexico is already warmer than average. Even more worrying is a current of warm tropical water that is looping unusually far into the Gulf for this time of year, with the power to turn tropical storms into monster hurricanes.
It’s called the Loop Current, and it’s the 800-pound gorilla of Gulf hurricane risks.
When the Loop Current reaches this far north this early in the hurricane season – especially during what’s forecast to be a busy season – it can spell disaster for folks along the Northern Gulf Coast, from Texas to Florida.
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If you look at temperature maps of the Gulf of Mexico, you can easily spot the Loop Current. It curls up through the Yucatan Channel between Mexico and Cuba, into the Gulf of Mexico, and then swings back out through the Florida Strait south of Florida as the Florida Current, where it becomes the main contributor to the Gulf Stream.
When a tropical storm passes over the Loop Current or one of its giant eddies – large rotating pools of warm water that spin off from the current – the storm can explode in strength as it draws energy from the warm water.
This year, the Loop Current looks remarkably similar to the way it did in 2005, the year Hurricane Katrina crossed the Loop Current before devastating New Orleans. Of the 27 named storms that year, seven became major hurricanes. Wilma and Rita also crossed the Loop Current that year and became two of the most intense Atlantic hurricanes on record.
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An image of the Gulf of Mexico showing how deep heat reaches in 2005, with a clear loop from west of Cuba up toward Louisiana.
The conditions observed in the Gulf in May 2022 are cause for concern. The National Oceanic and Atmospheric Administration is forecasting an above-average Atlantic hurricane season, with 14-21 named storms, six to 10 of them hurricanes. The Loop Current has the potential to supercharge some of those storms.
Why the Loop Current worries forecasters
Warm ocean water doesn’t necessarily mean more tropical storms. But once tropical storms reach waters that are around 78°F (26°C) or warmer, they can strengthen into hurricanes.
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Hurricanes draw most of their strength from the top 100 feet (30 meters) of the ocean. Normally, these upper ocean waters mix, allowing warm spots to cool quickly. But the Loop Current’s subtropical water is deeper and warmer, and also saltier, than Gulf common water. These effects inhibit ocean mixing and sea surface cooling, allowing the warm current and its eddies to retain heat to great depths.
In mid-May 2022, satellite data showed the Loop Current had water temperatures 78°F or warmer down to about 330 feet (100 meters). By summer, that heat could extend down to around 500 feet (about 150 meters).
The eddy that fueled Hurricane Ida in 2021 was over 86°F (30°C) at the surface and had heat down to about 590 feet (180 meters). With favorable atmospheric conditions, this deep reservoir of heat helped the storm explode almost overnight into a very powerful and dangerous Category 4 hurricane.
Within a storm, warm ocean water can create towering plumes of rising warm, moist air, providing high-octane fuel for hurricanes. Think about what happens when you boil a large pot of spaghetti on the stove and how the steam rises as the water gets hotter.
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As more moisture and heat rise within a hurricane, the pressure drops. The horizontal pressure difference from the center of the storm to its periphery subsequently causes the wind to speed up and the hurricane to become increasingly dangerous.
Since the Loop Current and its eddies have so much heat, they don’t significantly cool, and the pressure will continue to fall. In 2005, Hurricane Wilma had the lowest central pressure on record in the Atlantic, and Rita and Katrina weren’t far behind.
La Niña, wind shear and other drivers of a busy season
Forecasters have other clues to how the hurricane season might shape up. One is La Niña, the climate opposite of El Niño.
During La Niña, stronger trade winds in the Pacific Ocean bring colder water to the surface, creating conditions that help push the jet stream farther north. That tends to exacerbate drought in the southern U.S. and also weaken wind shear there.
Wind shear involves the change in wind speeds and wind directions with height. Too much wind shear can tear tropical storms apart. But less wind shear, courtesy of La Niña, and more moisture in the atmosphere can mean more hurricanes.
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How La Niña affects U.S.
La Niña has been unusually strong in spring 2022, though it’s possible that it could weaken later in the year, allowing more wind shear toward the end of the season. For now, the upper atmosphere is doing little that would stop a hurricane from intensifying.
It’s too soon to tell what will happen with the steering winds that guide tropical storms and affect where they go. Even before then, the conditions over West Africa are crucial to whether tropical storms form at all in the Atlantic. Dust from the Sahara and low humidity can both reduce the likelihood storms will form.
As global temperatures rise, the ocean’s temperature is increasing.
Studies suggest that the Atlantic is likely to see more storms intensify into major hurricanes as those temperatures rise, though there won’t necessarily be more storms overall.
Another trend we have been noticing is that the Loop Current’s warm eddies have more heat than we saw 10 to 15 years ago. But the impact of a warming trend could be devastating. [The conversation]
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