Rain along the Gulf Coast could become the first named storm of the Atlantic hurricane season

National Hurricane Center director Michael Brennan said meteorologists are expecting the system to strengthen, possibly into a tropical storm by early Wednesday. But coastal areas could experience tropical storm conditions this week, even if the system doesn’t officially get a name, Brennan said.

“The main hazard with these types of systems is largely the flooding from the heavy rainfall,” Brennan said. “And we could see potentially life-threatening flash and urban flooding across the Texas coast eastward into central Mississippi through Thursday. Prolonged rainfall may extend the flood threat into the weekend.”

Tornadoes were possible from the upper Texas coast across southern Louisiana, Mississippi, Alabama and the Florida Panhandle, forecasters said.

The storm's maximum sustained winds were around 30 mph (45 kph) Tuesday, just shy of the 39 mph (63 kph) needed to be named a tropical storm. The system had a 70% chance of forming into a tropical cyclone over the next two days, the hurricane center said.

Houston, where a World Cup match between Portugal and the Democratic Republic of the Congo is scheduled for Wednesday, has been under a flood warning since Monday. The stadium is covered, and no plans have been announced to move or reschedule the match.

By Thursday, the storms could drop 4 to 8 inches (10 to 20 centimeters) of rain, with isolated totals of a foot (30 centimeters) in coastal areas.

A tropical storm watch was already in effect from Sargent, Texas, to Morgan City, Louisiana. Rough surf could cause rip currents along the Gulf for the next couple of days.