Tropical Rainstorm Heads for US Gulf Coast, Flash Flooding Possible

A surge in tropical moisture will lead to flash flooding from Texas to Alabama and could become a life-threatening situation throughout the week.

By AccuWeather senior meteorologist Alex Sosnowski.

Published Jun 15, 2026 10:03 PM WIT | Updated Jun 16, 2026 6:11 AM WIT

Heavy rainfall from a slow-moving thunderstorm caused flash flooding in Waco, Texas, on June 14, leaving motorists stranded on southbound I-35.

A storm packed with a large amount of moisture has the potential to develop into a tropical depression or even be categorized as it drifts along the northern Gulf. The main threat from the brewing tropical rainstorm will be torrential downpours, which could lead to life-threatening flooding in some areas.

The first name on the list for tropical storms in the Atlantic basin is Arthur.

“Moisture from former Tropical Storm Cristina, which moved in from the Pacific, across Central America, into southern Mexico, and then into the Bay of Campeche, found its way into Texas this past weekend,” AccuWeather Lead Hurricane Expert Alex DaSilva said. “The moisture was accompanied by a tropical wave of low pressure that originated in Africa.”

Despite the commotion, no development has occurred through Monday evening. However, that may soon change.

“As a non-tropical jet stream storm becomes involved, the combination, along with warm waters, could develop a low-pressure area as the area of interest moves across the northwest portion of the Gulf, right along the Texas coast,” DaSilva said. “The time frame for possible development is from Tuesday to Wednesday before the system moves inland.”

Regardless of any organized development, life-threatening flash flooding will be possible across portions of eastern Texas over the coming days. Motorists should avoid stretches of road prone to flooding during heavy rain and never attempt to drive through flooded roads.

“By the middle of the week, the plume of moisture with or without an organized area of low pressure is forecast to merge with a cold front moving in from the north,” DaSilva said. “This setup will lead to widespread heavy rain across the Gulf Coast states.”

A broad zone is forecast to receive 4-8 inches of rain from southeastern Texas to central portions of Louisiana, Mississippi, and Alabama through Tuesday night alone.

Within this area, pockets of heavier rain are anticipated with an AccuWeather Local StormMax of 12 inches for the period that began on Sunday and extends through Tuesday night. More rain will follow in some areas for the balance of the week.

While some areas may experience drought-busting rainfall, any benefit will come at the risk of flash flooding.

From 2-6 inches of rain has fallen on parts of the Texas Hill Country in 24 hours from Sunday to Monday morning, with incidents of flash flooding reported.

By Tuesday night, a tropical rainstorm is expected to form off the Texas coast. AccuWeather is the only known source to use the tropical rainstorm term, bringing additional attention to tropical systems that may not officially receive a name but pose a flooding risk.

“This area can further amplify the flood risk starting Tuesday night along the Texas coast, extending into the Houston area on Wednesday which would coincide with the World Cup match that afternoon,” AccuWeather Vice President of Forecast Operations Dan DePodwin said. “Although the match is inside, flooding could cause road closures and cause dangerous travel conditions.”

“As the rainstorm consolidates along the Texas coast, downpours should ease over the Hill Country by the middle of the week, but problems will increase farther to the east in Texas and along the central Gulf Coast,” AccuWeather Chief On-Air Meteorologist Bernie Rayno said.

“A significant flood risk exists each day this week, shifting slowly eastward from Texas on Monday, Tuesday, and Wednesday to Louisiana, Mississippi, Alabama, and Georgia during the second half of the week,” DePodwin said.

From Wednesday to Friday, a swath of 4-8 inches of rain is anticipated with a belt where 8-12 inches of rain is forecast to occur. Within this heaviest rainfall zone, the AccuWeather Local StormMax is 20 inches.

Enough rain will fall on some of the river systems from Texas to Alabama to bring a surge of water. Minor to moderate flooding is possible on rivers such as the Neches, Guadalupe, Brazos, San Antonio, Trinity, Colorado, and Nueces in Texas.

Rivers farther to the east, such as the Sabine, Pearl, Tombigbee, and Alabama, may also experience significant surges. Some portions of these rivers could reach major flood stage, depending on rainfall and runoff, despite lower rainfall expected in some headwaters.

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Heavy rain that occurred over the central part of the nation, well inland, is resulting in minor to moderate flooding along portions of the Illinois, Missouri, and Mississippi rivers this week. But it will take two to three weeks for that surge on the Mississippi River to reach the Gulf Coast, and it will not coincide with the more immediate surge of water from the impending rainstorm and runoff over the next week.

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