11 p.m. EDT update: Tropical Storm Issac creating storm surge

As of 11 p.m. EDT Wednesday, slow-moving Tropical Storm Issac was dumping heavy rain over Louisiana, and still producing a significant storm surge, the National Hurricane Center reported.

Isaac was located about 70 miles west of New Orleans, or 15 miles south of Baton Rouge, La. Winds were holding at 60 mph and the storm was moving to the northwest at 6 mph.

Water levels were expected to remain high along the northern Golf Coast for several days.

The strongest winds are primarily over the water or near the coast. The story is expected to continue to weaken over the next 48 hours, becoming a tropical depression by Thursday night.