The latest update from the National Hurricane Center shows that Isaac now has maximum sustained winds of 75 mph, which upgrades it to category 1 hurricane status.

At 1 p.m., Hurricane Isaac was located about 55 miles south, southeast of the mouth of the Mississippi River about 135 miles southeast of New Orleans. Pressure has dropped to 975 mbs.

A hurricane warning has been replaced by a tropical storm warning from the Mississippi-Alabama border eastward to Destin, FL, according to the NWS. The warning for east of Destin has been discontinued.