A sprawling area storms churning toward the Gulf Coast threatens to bring significant rain and flash flooding this week to a large swath of the southeast, from the Florida panhandle to Louisiana and parts of eastern Texas.

Invest 93L is taking its time moving across Florida, and it could still become a tropical depression later this week, according to the latest advisory from the National Hurricane Center.

“Environmental conditions appear generally favorable for additional development, and a tropical depression could form by the middle to latter part of this week as the system moves across the northeas...