Steamy ocean means ‘a very, very busy season’ for hurricanes, forecasts say
The upcoming hurricane season is shaping up to be another extremely active one, powered by the Atlantic’s record-breaking run of high temperatures.
The early season forecast from Colorado State University — a key pioneer of preseason hurricane forecasting — calls for another above-average season. The bottom line: Florida and other coastal states should prepare to batten down the hatches when the season begins on June 1.
Specifically, the forecast calls for 23 named storms, 11 of which could be hurricanes and five that could strengthen into major hurricanes of Category 3 or higher. The average season has 14 named storms, seven hurricanes and three major hurricanes.
That would put this season on par with some of the most active on record, including 2020, when there were so many storms the National Hurricane Center ran out of names and had to use Greek letters.
“This is the highest April forecast we’ve put out,” Phil Klotzbach, CSU meteorologist and lead author of the forecast, told meteorologists at the National Tropical Weather Conference on Thursday. “We are forecasting a very, very busy season.”
Hurricane season begins June 1 and ends Nov. 30, with a peak in August and September. Forecasting what the season could hold this early is usually seen as a tough task. The gold standard — from the National Oceanic and Atmospheric Administration — is in May.
But unlike last year — when two major weather phenomena with opposite effects duked it out in the Atlantic — all of this year’s current early forecasts, including from Accuweather and Weather Tiger, are pointing
to one thing: an active season.
“At this long lead time, there’s a lot of uncertainty. This year, I’d say we’re a lot more confident than we were last year,” Klotzbach said.
The main factor for the high numbers is the Atlantic, where sea-surface temperatures are running at temperatures that are more common in July, said Brian McNoldy, a senior research associate at the University of Miami.
“This year it has not
(and will not) get below 20°C for the first time in recorded history!” he posted on X, formerly known as Twitter.
And there’s no sign the Atlantic is cooling off significantly anytime soon. Klotzbach said if the Atlantic warms at the slowest possible rate for the next few months, it would still be one of the top five warmest years in the Atlantic on record.
Another factor that could push this season to new-record territory is the shift in global weather phenomena from El Niño to a potential La Niña. El Niño is usually marked by a less active hurricane season in the Atlantic, thanks to the wind patterns that are more likely to break up storms as they attempt to form.
Last year’s hurricane season included an El Niño, but its storm-dampening effects were overwhelmed by the steamy Atlantic.
Current models from NOAA and beyond call for the still-remaining El Niño effect to die out in the next few months, and the chances that it will be replaced in the peak of hurricane season by a La Niña, which is linked to a friendlier Atlantic for storm formation, are rising by the week.
Another storm metric that stands out in the CSU forecast is ACE (accumulated cyclonic energy). That’s a measure based on how long a storm stays at the range of hurricanestrength categories. With each hurricane, the number rises — an indicator of the strength of the overall season.
This season, CSU calls for a very high ACE of 210, when an average season sees only 123. Compare that to 2020, when we saw 30 named storms, 14 of which became hurricanes, which had an ACE of
179.8. This year’s prediction of 210 still falls below the highest seasonal ACE on record — 250 from 2005.
But in his talk on Thursday, Klotzbach told the crowd CSU’s models showed a potential for up to a 269 ACE this year, which was adjusted down in the final forecast.
“All the way up to the most active season on record, potentially, and all the way down to what we saw last year,” he said. “We’re talking ACE at basically record levels.”
Still, Klotzbach warned, an overactive season does not immediately translate to more landfalls. It just increases the odds. He warned residents in coastal states to prepare before the start of the season.
“Obviously, it only takes that one hurricane to make this year a busy season,” he said.