Hurricane Isaias Rises Late Over a Hotter Gulf

The Atlantic hurricane season finally produced its first hurricane, and it waited until October to do it. Hurricane Isaias formed in the Gulf of Mexico this week and was moving toward the northern Gulf Coast, with forecasters warning residents to rush preparations to completion. It is the latest-in-the-season first Atlantic hurricane to form since 1914, according to Colorado State University hurricane researcher Phil Klotzbach.

The National Hurricane Center said the storm was expected to flirt briefly with major hurricane status, reaching winds near 111 mph (178 kph), before increasing wind shear knocked it back down. Landfall for Hurricane Isaias was forecast somewhere between the Mississippi and Alabama coastline and the Florida Panhandle, most likely as a strong Category 1 or weak Category 2 storm. It is not expected to be a major hurricane at landfall, but forecasters say water — surge and rain — will still bring serious damage.

The long wait was itself unprecedented in the satellite era. The Atlantic had gone the whole 2026 season without producing a single hurricane, with eight named storms all fizzling before reaching hurricane strength.

A super El Nino kept the season quiet until it did not

For most of the season, the Atlantic saw an unusually long stretch without any hurricanes. That was no accident, said Suzana Camargo, who studies extreme weather at Columbia University. A supersized El Nino — the natural warming of Pacific waters that reshapes weather patterns worldwide — sent high-level winds across the Atlantic that tore storms apart before they could organize.

All season there had been what Klotzbach called "this battle between shear and just the overall conducive conditions." El Nino's winds dominated the Atlantic while boosting Pacific activity to what could soon be record high levels. Hawaii had several close calls this year, and heavy rains and winds damaged communities on some of the islands, NPR reported.

Then a brief window of moderate shear opened, and Hurricane Isaias moved through it. The storm was lopsided at first, unable to build the complete circular eyewall that lets a hurricane power up fully. Then it reached the Gulf's warm water and heavy moisture. "The warm waters and high moisture won," Klotzbach said.

Climate change is loading the dice

The Gulf of Mexico is about 2.7 degrees (1.5 degrees Celsius) warmer than normal. Its 86 degree (30 degrees Celsius) waters are 100 to 500 times more likely to be that hot because of climate change from the burning of coal, oil and gas, said climate scientist Kristina Dahl, vice president of the nonprofit Climate Central, which calculates the boost global warming gives to extreme weather.

The extra heat showed in Hurricane Isaias's behavior. The storm jumped from 40 mph to 80 mph (64 kph to 129 kph) in a single day — the kind of rapid intensification scientists say is becoming more common as oceans warm. Camargo said the data pattern is increasingly clear: more of the most intense hurricanes, and more storms gaining strength very fast. Even some of this year's Pacific hurricanes, she said, look like previews of a hotter climate's normal.

The warming does not stop at wind speed. A warmer atmosphere holds more water, so storms drop more rain and flooding gets worse. The hurricane center was warning of urban, river and flash flooding across the Southeast this weekend.

The broader climate picture backs up the warning. The Planetary Health Check 2026 found seven of nine planetary boundaries now breached, following twelve months of extremes across land and oceans.

Storm surge brings another long-term danger. Dahl said the surge would reach deeper and farther because of sea level rise caused by climate change — about six and a half inches of local rise over the past century attributable directly to it. The National Hurricane Center called the expected surge "life-threatening," according to an Associated Press report.

What the coast is facing now

One break in the coast's favor: El Nino is not done with Hurricane Isaias. Wind shear was forecast to strengthen from around 20 mph (32 kph) to 52 mph (84 kph) as the storm approached land, tearing at its structure. That is why forecasters expect landfall below major-hurricane strength rather than above it.

The season's strange calm should not breed comfort, though. After El Ninos come La Ninas, which usually mean more active Atlantic hurricane seasons, NPR reported. The background warming keeps climbing regardless of the cycle. "Climate change is like this long-term big kahuna warming everywhere, and El Nino's like a little icing on the cake," Dahl said.

Gulf and Southeast communities have paid for hurricane water before. Two years after Hurricane Helene, recovery funding still covers only a fraction of the damage in western North Carolina.

Coastal residents from Mississippi to the Florida Panhandle were told to finish preparations before conditions deteriorate late Friday into Saturday. Hurricane Isaias itself may stay below major-hurricane strength, but its path from nowhere to near-major in a matter of days shows what happens when storm-friendly conditions meet water made far hotter by warming.