Gulf tropical trouble could unleash significant flooding in southeastern US
A high-risk tropical development zone could become the Atlantic's next named storm and reach the central Gulf Coast this weekend, bringing torrential rain and worsening flooding in parts of the Southeast.
Drivers encountered flooded roads in Charleston, South Carolina, on Oct. 4 as heavy rain fell across the area.
A developing storm in the southwestern Gulf could bring another round of heavy rain to parts of the southeastern United States later this week and weekend, raising flooding concerns in areas already drenched by a stalled front. There is a high chance that this will eventually become a tropical depression or Tropical Storm Isaias.
"We are closely monitoring a mass of showers and thunderstorms in the Bay of Campeche this week," AccuWeather Lead Hurricane Meteorologist Alex DaSilva said.
This image of the Gulf was captured on Monday morning, Oct. 5, 2026, and shows a mass of showers and thunderstorms in the Bay of Campeche. This is the area being watched for tropical development later this week. (AccuWeather Enhanced RealVue™ Satellite)
Factors favoring tropical development
Gulf water temperatures are well into the 80s F, providing ample warmth to support tropical development. Tropical systems generally develop over waters near 80 F or warmer, although atmospheric conditions also determine whether a storm forms.
Wind shear, which is changes in wind speed or direction in the atmosphere, can disrupt a developing tropical system.
"There is a high chance this mass will overcome wind shear enough and evolve into a tropical depression or storm. At the very least, this should become a tropical rainstorm," DaSilva explained.
The next name on the list for tropical storms in the Atlantic basin is Isaias.
Where might the storm go?
"Due to prevailing steering winds, the most likely path would be to the north-northeast toward the U.S. later this week with landfall along the central Gulf Coast this weekend," DaSilva said.
A dip in the jet stream should steer the system north-northeastward toward the central Gulf Coast.
"The other, less likely, possibility is the storm tracks into Mexico, missing that pickup by the jet stream later this week," DaSilva said. "Based on climatology of El Niño years, there has never been a landfall in Texas during October, November and December due to prevailing westerly jet stream winds."
The forecast track and intensity should become clearer once a well-defined circulation center forms and the surrounding atmosphere reacts.
Could this become a hurricane?
As of Oct. 5, the Atlantic basin has produced eight named storms and no hurricanes, with strengthening El Niño conditions helping to suppress activity. El Niño, the warm phase of a recurring climate pattern in the tropical Pacific, could become one of the strongest on record later this year. El Niño often leads to numerous tropical storms and hurricanes in the eastern Pacific and tends to suppress activity in the Atlantic through wind shear.
By early October, a typical Atlantic season has produced about 11 named storms, including five hurricanes and two major hurricanes.
"As this storm organizes and begins to drift north-northeastward, increasing wind shear may limit the amount of strengthening and could lead to the storm becoming distorted," DaSilva said. "Because of this there is about a 15% chance of the storm becoming a hurricane."
Heavy rain could worsen Gulf Coast flooding
Rainfall could be unevenly distributed, with little or no rain west of the center and the heaviest downpours to the east, DaSilva explained. Areas receiving the heaviest rain could pick up 1–4 inches, with locally up to 8 inches possible. These amounts would be in addition to rain from the stalled front through midweek.
Several inches of rain have fallen in parts of the Gulf Coast, from the upper Texas coast to Florida, in recent days, providing relief from drought in some areas.
Additional heavy rain could trigger flash flooding and worsen flooding along streams, bayous and rivers. Some locations could experience moderate to major river flooding, while other areas receive further drought relief.
Should a tropical storm bring additional heavy rain to parts of this zone, moderate to major flooding could occur, while further long-term drought relief could occur in other locations.
The area of interest could develop subtropical characteristics, combining features of tropical and non-tropical storms.
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