GULF OF MEXICO — The National Hurricane Center assigned a 60% probability of tropical development for Invest 92L over the next 48 hours as of 2 p.m. EDT on Monday, October 5, 2026. The agency also assigned an 80% probability of tropical development for the system over the next seven days at the same time. A disturbance designated Invest 92L formed over the southwestern Gulf of Mexico after a surface trough of low pressure formed near the coast of Mexico over the weekend prior to October 5, 2026.

Invest 92L is expected to drift eastward over the southwestern Gulf before turning north and increasing speed. Model ensembles from Google’s DeepMind, NOAA’s FV3, and European models project the system will arc eastward and northward toward the central U.S. Gulf Coast.

Sea surface temperatures in the Gulf of Mexico reached a record high of 89°F on October 4, 2026, which is 1.8°F above the 30-year average. The Gulf-wide sea surface temperature was approximately 0.5 degrees Celsius higher than any other year on record for October 4.

The NHC’s 48-hour tropical cyclone development probability forecasts align with historical patterns where systems in the Gulf of Mexico have a 50–70% chance of development under similar sea surface temperature and atmospheric conditions. The National Hurricane Center has historically issued forecasts for tropical development in the Gulf of Mexico during October, with an average of 1.2 named storms forming in the region during this month between 1980 and 2020.

The NOAA/NWS Weather Prediction Center placed far southeast Alabama, southern Georgia, and the northern half of Florida in a marginal risk area for excessive rainfall on Monday, October 5, 2026. Heavy showers and thunderstorms occurred over southeast Alabama and southwest Georgia at midday on that day.

The Weather Prediction Center's 7-day rainfall forecast indicates potential for 5 to 10 inches of rain over the northeast Gulf, with isolated amounts up to 20 inches offshore. The NWS Weather Prediction Center has issued flash flood watches for the Florida Panhandle and surrounding areas on multiple occasions in October, including October 4, 2026, when a 24-hour rainfall total of 5 to 7 inches was recorded in the Jacksonville area.

Wind shear is forecast to increase across the northern Gulf later in the week, which could limit further development of the system. Coastal conditions along Florida’s Atlantic coast are expected to become rougher by midweek, with an increased risk of rip currents.

As of Monday, October 5, 2026, there were no named tropical systems in the Atlantic Basin. A separate disturbance in the Northeast Pacific, located about 700 miles south of the Gulf disturbance, has a 50% chance of development by Wednesday and a 90% chance over the next week.

Why It Matters

The National Hurricane Center's 48-hour forecast accuracy for tropical development in the Gulf of Mexico has averaged 72% over the past decade, according to the National Hurricane Center Forecast Verification report. The NHC’s 2026 intensity forecasts for tropical cyclones demonstrated lower errors than all guidance models through 96 hours, reflecting advancements in rapid intensification prediction over the past decade.

The National Hurricane Center was officially founded in 1955 and is part of NOAA’s National Centers for Environmental Prediction. It has been responsible for tropical cyclone forecasts in the Atlantic and eastern Pacific for over 70 years. The NHC has a long-standing collaboration with the NWS Weather Prediction Center to monitor and predict tropical weather systems, with the latter providing critical data on rainfall and flooding risks across the Gulf Coast.