Tropical Storm Arthur has been downgraded from a cyclone as it made landfall along the upper Texas coast Thursday, but forecasters warn the real danger lies ahead: catastrophic flooding that could prove life-threatening across a five-state swath of the Southeast.
Maximum sustained winds dropped to around 35 mph as the storm lost intensity upon hitting land. Yet the National Hurricane Center and other agencies are treating Arthur as a serious flood event, expecting several inches of rain through Friday and potentially much more in isolated areas.
The storm marked the first tropical cyclone of the Atlantic season. It is expected to continue weakening as it crosses southeastern Texas and western Louisiana before pushing into the broader Southeast.
"The main threat from Arthur is going to be a prolonged, multiday, heavy rainfall event that could produce dangerous to life-threatening flash flooding," National Hurricane Center director Michael Brennan said. Rainfall totals could reach 5 to 10 inches across broad areas, with some isolated pockets seeing as much as 20 inches.
The flooding threat extends across Texas, Louisiana, Mississippi, Alabama, Georgia, and the Florida Panhandle through the week, with the risk shifting eastward as the storm progresses. Communities in Louisiana and Mississippi have already begun distributing sandbags and clearing drainage systems to prepare for the inundation.
The National Weather Service's Prediction Center issued a High Risk for Excessive Rainfall for portions of the Central Gulf Coast, a designation rarely deployed and one that signals potential for both widespread and dangerous conditions. Officials are urging residents not to attempt crossing flooded roadways or waterways.
Beyond flooding, Arthur poses additional hazards. Coastal areas along the northwestern Gulf face life-threatening surf and rip-current conditions, while tornadoes remain possible through Thursday. All coastal watches and warnings were discontinued Wednesday as the storm weakened, but water-related dangers persist.
AccuWeather Vice President of Forecast Operations Dan DePodwin emphasized the shifting nature of the threat: "A significant flood risk exists each day this week, shifting slowly eastward from Texas into Wednesday to Louisiana, Mississippi, Alabama and Georgia during the second half of the week."
Author James Rodriguez: "A downgraded storm that still commands respect from every major forecasting agency is a stark reminder that tropical systems can kill you as easily with rain as with wind."
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