"Heavy rain is already moving through Louisiana and will continue over the next few days," AccuWeather's Alex DaSilva said.

The National Hurricane Center once again dropped the likelihood of formation for the tropical system hovering just offshore of Mississippi to 30% in the next two to seven days.

Houston is expected to be hit by heavy rainfall later in the week, with a slight risk of excessive rainfall on Friday in eastern and southern parts of the area. Regardless of development, showers and thunderstorms will likely move through southeast Texas.

The storm will bring heavy rainfall to the region, and a flood watch was in effect for southeastern Louisiana.

Downpours are expected in Houston on Friday as a tropical disturbance along the northern coast of the Gulf of Mexico stalls without strengthening.