A developing tropical disturbance in the Gulf of America drew closer scrutiny Monday after forecasters raised the likelihood of formation.
The National Hurricane Center said a new area of low pressure may take shape over South Texas, track northeast across the state, and then move back over the northwestern Gulf by the middle of the week. In its latest outlook, the agency increased the chance of development from 10 percent to 30 percent.
Forecasters do not expect the system to strengthen into a major storm anytime soon, but they say conditions have become favorable enough to allow at least some tropical development.
The updated forecast comes as flood watches remain in effect across broad areas of Texas, Louisiana and Mississippi, where millions of people are already bracing for several days of intense rainfall.
Meteorologists said the flood danger is expected to arrive before any tropical system is able to fully organize.
Rainfall totals in some communities could top 10 inches by midweek, heightening the risk of flash flooding and fast-rising rivers and streams.
The developing situation marks the most significant tropical threat in the Gulf since the start of the 2026 Atlantic hurricane season.
The NHC highlighted the area in its latest Tropical Weather Outlook, noting that low pressure may develop late Tuesday across South Texas before moving toward the Gulf.
The National Hurricane Center (NHC) said a new area of low pressure could form over South Texas before moving northeast across the state and re-emerging over the northwestern Gulf by midweek
Forecasters said the system’s future depends on how quickly it can organize after emerging over water.
While the confidence remains relatively low, the increase indicates growing concern that the disturbance could acquire tropical characteristics later this week.
The latest Tropical Weather Discussion from the hurricane center noted that a trough of low pressure stretching across northeastern Mexico and South Texas will remain in place through midweek.
‘New low pressure may develop late Tue across S Texas and move NE across coastal Texas through Wed,’ forecasters said.
‘This system could re-emerge over the northwestern Gulf Wed, where environmental conditions may support some development.’
Even if the disturbance never earns a name, officials warned it could still produce dangerous impacts.
The National Weather Service (NWS) has issued flood watches covering a vast area from South Texas through eastern Texas and into Louisiana and Mississippi as deep tropical moisture streams northward from the Gulf.
The Houston-Galveston office warned that repeated rounds of thunderstorms could produce between two and seven inches of rainfall through Wednesday, with isolated higher amounts possible.
The National Hurricane Center increased the odds of the disturbance developing into a storm
Rainfall rates may reach two to five inches per hour in the strongest storms.
Across southwest Louisiana and southeast Texas, forecasters warned that a stalled front interacting with an exceptionally moist air mass could generate three to six inches of rain, with isolated totals reaching 10 inches.
The New Orleans office issued flood watches through Wednesday morning, warning that widespread rainfall totals of two to four inches are expected, with locally higher amounts likely.
Meanwhile, portions of central and south-central Texas face an even more serious flood risk.
The NWS in Austin and San Antonio warned that very humid tropical air combined with a stalling front could create life-threatening flooding in some areas.
Officials said isolated rainfall totals exceeding eight inches are possible, with rainfall rates surpassing two to three inches per hour.
Flood watches have also been posted across Deep South Texas, where forecasters expect widespread totals between three and six inches, with pockets receiving more than eight inches.
The increase in odds comes as flood watches stretch across large swaths of Texas, Louisiana and Mississippi , where millions of residents are already facing days of heavy rain
Meteorologists emphasize that the flooding threat is not necessarily tied to the formation of a tropical storm.
Instead, the same broad weather pattern that could eventually spawn a tropical cyclone is already funneling enormous amounts of moisture into the region.
Slow-moving thunderstorms repeatedly tracking across the same locations could trigger flash flooding long before any organized center develops.
The NHC said active showers and thunderstorms are expected across the northwestern Gulf throughout the week as the disturbance evolves.
The broader Atlantic basin is also becoming increasingly active.
Four tropical waves are currently moving westward across the Atlantic and Caribbean, including one located in the eastern Atlantic near the coast of Africa.
While none pose an immediate threat to the US, they serve as a reminder that the Atlantic hurricane season is ramping up as ocean temperatures remain favorable for development.
For now, forecasters are keeping their focus on the Gulf.
The 30 percent development probability remains relatively modest. Still, it represents a significant increase from last week’s outlook and reflects a growing signal that conditions could become more favorable in the days ahead.
Residents across Texas, Louisiana and Mississippi are being urged to closely monitor forecasts, particularly those living in flood-prone areas.
