Hurricane Isaias ( ee-sah-EE-ahss) was a strong and destructive tropical cyclone that caused significant impacts to the Southeastern United States in early October 2026. Upon reaching hurricane status early on October 8, it tied the record for the latest date of the formation of the first Atlantic hurricane of a season set in 1905. In addition, it was the first hurricane to make landfall in the United States since Hurricane Milton exactly two years prior. The ninth named storm, first hurricane, and first major hurricane of the 2026 Atlantic hurricane season, Isaias originated from a low-pressure area over the southwestern portion of the Gulf of Mexico on October 6. After developing into a tropical storm, Isaias steadily strengthened while moving northeastward towards the Gulf Coast. It became a hurricane on October 8, before quickly strengthening and peaked in intensity as a major hurricane on October 9. Increasingly unfavorable conditions caused Isaias to weaken slightly before making landfall near Destin, Florida, later that night, before rapidly weakening and becoming post-tropical the following morning on October 10 over Alabama, before dissipating on October 12. Its remnants were absorbed into a new system that moved towards Iceland where it underwent explosive cyclogenesis on October 14, and eventually set the lowest October pressure in Iceland and caused blizzards in Greenland.
Because of projections of landfall in the United States, the approaching storm was expected to have significant impacts on most of the Gulf Coast, including widespread evacuations in Florida, Alabama, and Mississippi, as well as the closure of significant infrastructure. One estimate suggested that 63% of the Gulf of Mexico's oil production—1,300,000 barrels per day—was paused.
In combination with a cold front, the predecessor to Isaias caused significant damage to Tamaulipas and Veracruz including floods, downed trees, and power outages. Nine fatalities have been confirmed as a result of Isaias, all in the United States: six in Florida, two in Alabama, and another in South Carolina. Insured losses in the United States were expected to surpass $2 billion (2026 USD).
Meteorological history
On October 3, the National Hurricane Center (NHC) began to monitor the southwestern Gulf of Mexico for a low-pressure area that was expected to develop. Two days later, a trough developed along the Gulf Coast of Mexico, producing an area of thunderstorms. Wind shear over the Gulf of Mexico was also weakened in comparison to how it had been throughout the rest of the season, which was itself higher than average due to the 2026–2027 El Niño event. On October 10, as the system became more organized, On October 6 at 21:00 UTC, the system developed a closed circulation and was designated as Tropical Depression Nine. Around that point in time, the system was moving slowly eastward as a result of a trough, and the convection was found mostly to the north. Environmental conditions for the cyclone were generally favorable with moderate southwesterly shear being offset by high oceanic heat content, moist mid-level relative humidity levels, and upper-level divergence. At 09:00 UTC on October 7, the system reached tropical storm strength, and was named Isaias.
The storm strengthened steadily over the next day despite some shear displacing the low and mid-level centers, and the storm was upgraded to a hurricane at 03:30 UTC on October 8 based on data collected by hurricane hunters—the first of the 2026 season. A faster rate of intensification ensued as the hurricane turned more to the northeast, and the following day on October 9, Isaias reached its peak intensity of 120 mph (195 km/h) and a central pressure of 958 mbar (28.3 inHg) as an eye began emerging, whereupon it became a Category 3 major hurricane. Increasingly hostile wind shear induced weakening as the hurricane began to accelerate towards the Florida Panhandle, resulting in a asymmetric structure with the bulk of the convective activity becoming displaced to the north and northwest of the eye with a partial eyewall. Isaias then made landfall at 01:30 UTC on October 10 near Destin, Florida, as a Category 2 hurricane with winds of 105 mph (169 km/h) and a pressure of 971 mbar (28.7 inHg). As the night progressed and Isaias tracked inland into southern Alabama, the system began to rapidly degrade in intensity and signatures on weather radar and became a post-tropical cyclone at 06:00 UTC. The surface center dissipated a day later on October 12. A new area of low pressure formed within the storm’s remnants, absorbed the remnants of Isaias and proceeded to undergo explosive cyclogenesis near Iceland on October 14. The storm moved over Northern Europe until it finally dissipated on October 19, over Siberia.
Forecasting distinctions
In forecasting Isaias, the NHC relied particularly heavily on models based on artificial intelligence (AI). Early in the system's life, physics-based models, including the Global Forecast System and Integrated Forecasting System, were indicating a landfall in Louisiana or Mississippi as a tropical storm. The AI models, such as Google DeepMind's model, preferred a landfall location in Alabama or Florida with the possibility of Isaias attaining major hurricane status. The AI models also made these predictions before Isaias had underwent tropical cyclogenesis. Forecasters, such as the director of the NHC, also noted that AI models allowed for more "bullish" predictions, jumping straight to higher intensity categories instead of slowly increasing strength predictions.
Preparations
Mexico
In Tzitzapollo, 60 people were evacuated due a risk of landslides caused by the preceding disturbance. Shelters were opened in other towns of Veracruz to support evacuees. Across five states—Campeche, Tabasco, Tamaulipas, Veracruz, and Yucatán—over two dozen ports were closed, including Tampico, Progreso, and Campeche. Classes in Campeche were suspended. In Isla Arena, the school was converted into a shelter. The community was also placed under three evacuation orders, with 23 people taking a minibus out of the town. A total of 68 storm shelters were opened in the city of Mérida as well as in Celestún and Progreso. Multiple families were evacuated from flood-prone areas in Celestún. Twenty-seven municipalities of Yucatán halted nonessential work and several had classes also suspended. Hundreds of fishermen ceased working in Campeche. Around 2,800 personnel in Plan DN-III-E were deployed to the Yucatán Peninsula.
United States
On October 7, hurricane watches were issued for the coasts of Alabama, Mississippi, and the Florida panhandle, and tropical storm watches extended from Florida to the Mississippi River Delta. Soon after, many of those watches were upgraded to warnings. Widespread tornado watches were also issued. Chevron Corporation began evacuating nonessential workers from oil platforms in the Gulf of Mexico. Shell plc evacuated five oil rigs. In total, 63% of the Gulf of Mexico's oil production, 1,300,000 barrels per day, was paused. In addition, 56% of natural gas production in the region was suspended. To limit the impact of Isaias, President Donald Trump approved releasing some oil from the United States's strategic reserves. Amtrak suspended the Mardi Gras Service from October 8–11 because of the storm and truncated its Crescent to Atlanta with service to and from New Orleans being provided via a bus bridge on October 7–8; no alternate transportation was offered on October 9–11. DoorDash suspended delivery operations across parts of the Florida Panhandle, Alabama, Mississippi, and Louisiana due to Isaias. Gulf Islands National Seashore closed before the arrival of Isaias. The American Red Cross organized a large operation across the Gulf Coast of the United States, opening 21 shelters and housing over a thousand people.
Florida
Florida governor Ron DeSantis issued a state of emergency for 25 counties ahead of the storm. The Florida National Guard was also activated, 5,000 soldiers aiding. with Local governments in northwestern Florida also declared their own states of emergency. On October 7, mandatory evacuation orders were issued in Okaloosa County. Public transportation in the county was shut down. Alligator Point, Bald Point, Dog Island, and St. George Island also each had mandatory evacuation orders placed on them. Destin–Fort Walton Beach Airport and Pensacola International Airport closed. Uber partnered with the state to give free service on any round trip valued less than $40. Multiple school districts in the Florida Panhandle cancelled classes due to Isaias. The Mississippi State University basketball exhibition being played in Pensacola against Florida State University on October 10 was cancelled. Several high school football games in the region were also rescheduled. The Marco Patriots readied supplies and truck for deployment to communities struck by Isaias. Some events in Tampa Bay, including the metropolitan area's celebration of Oktoberfest, were postponed. In response to Isaias and another weather system earlier, some communities in that area also prepared tools against flooding, including clearing and grading canals and drainage ditches. All Waffle House locations in Escambia and Santa Rosa counties were closed on the morning of October 9, setting the informal Waffle House Index to “red” (the highest on the scale).
As Isaias moved ashore, an extreme wind warning was issued for southern Escambia, Okaloosa, and Santa Rosa counties.
Alabama and Mississippi
Kay Ivey, the governor of Alabama, issued a state of emergency for 40 of the state's counties. Dauphin Island issued evacuation orders and shut down water service. Sites across Alabama and Mississippi were opened for residents to fill sandbags. Shelters were opened in Jackson County, Mississippi, where a voluntary evacuation was ordered before being cancelled due to decreasing storm surge forecasts. Harrison County also opened shelters which would house 53 people. Mobile issued a curfew. Mobile Regional Airport ceased operations. The United States Post Service suspended services in parts of Alabama and Mississippi. Two festivals in Southern Alabama had changes in schedule due to concerns over Isaias. Multiple school districts in southern Alabama and Mississippi cancelled classes due to Isaias. Several high school and collegiate American football games in the region were rescheduled. Gulf State Park closed before the arrival of Isaias. The Coast Transit Authority halted service. Drawbridges operated by the Mississippi Department of Transportation, including one on I-110, were closed for marine traffic. Panic buying of gasoline was reported in Alabama, associated with an increase in prices partially from an escalation in the 2026 Iran war. Two oil refineries were also brought offline, totaling 2.5% of the nation's capacity. President Trump cancelled a visit to a Georgia–Alabama college football game in Tuscaloosa. The University of Alabama imposed a temporary ban of tailgating until storm conditions passed.
Elsewhere
The governor of Georgia, Brian Kemp, declared a state of emergency. Evacuation sites were opened in Albany and Moultrie. Atlanta Pride was pushed back due to expected inclement weather. The Que Pasa Fest in New Orleans, Louisiana, was cancelled due to Isaias. A voluntary evacuation order was issued in part of Venice over concerns of storm surge flooding. Shelters were also opened in North Carolina.
Impact
Mexico
Isaias and its precursor combined with a cold front produced rainfall in the state of Tamaulipas only a week after a previous flood event. Rainfall totals of 1 inch (25 mm) to 3 inches (76 mm) fell in Matamoros. Several roads were flooded in the city.
Floods resulted in the suspension of classes at six schools in Matamoros. In northern Veracruz, 25 municipalities reported some sort of impact including downed trees, damaged homes, and overflowing rivers. Several towns in Zontecomatlán reported having degraded access. A bridge connecting the aforementioned municipality to Xoxocapa was damaged.
Before the tropical cyclone formed, Yucatán's soils were already well saturated, increasing the flood threat. Strong winds and surf in Campeche downed eight palapas and caused beach erosion in Sabancuy. A road connecting Isla Arena became flooded. During the passage of Isaias, authorities reported power and water outages in Campeche, with storm conditions from Isaias inhibiting recovery. The overflow of a swamp in Celestún flooded several homes, affecting 200 families.
United States
Florida
In Florida, Santa Rosa Sound recorded a sustained wind of 91 mph (146 km/h) and a gust to 116 mph (187 km/h). At Oriole Beach, a Texas Tech "sticknet" instrument recorded sustained winds of 95 mph (153 km/h) and a gust to 116 mph (187 km/h). Pensacola's city hall reported a wind gust of 102 mph (164 km/h). In Pensacola and Milton, there were reports of roofs being blown off by Isaias. There were also reports of property damage in Gulf Breeze and Navarre as a result of wind. Pensacola International Airport suffered some damage. Dangerous conditions forced several communities in Florida to temporarily suspend emergency response. These conditions also forced the closure of the Theo Baars Bridge, Bob Sikes Bridge, and Pensacola Bay Bridge. A wind gust of 118 mph (190 km/h) was measured in Jay, causing extensive tree damage in the nearby area. Panama City recorded a 5.51 ft (1.68 m) storm surge as the storm passed, while Niceville recorded 8.06 in (205 mm) of rain. About 450,000 customers lost power in Florida, according to Governor DeSantis. After having power restored, an outlet overload caused a house fire in Escambia County. Power outages also forced Escambia County School District and Santa Rosa County District Schools to extend class suspensions. Jackson County experienced damage to crops. One of the largest magnolia trees in the United States and the largest one within the state was downed by Isaias.