Note: The time of the tropical cyclone's center location at the bottom of the graphic will be 3 hours earlier than the time of the current advisory. The forecast cycle for each advisory begins 3 hours prior to the issuance of the advisory.
The federal government says oil and gas operators continue to evacuate offshore platforms and rigs in Tropical Storm Isaac's likely path through the Gulf of Mexico.
Isaac is expected to become a Category 2 hurricane before making landfall Wednesday.
The Bureau of Safety and Environmental Enforcement says 39 production platforms and eight drilling rigs have been evacuated. That's about 6.5 percent of the 596 manned platforms and 10.5 percent of the 76 rigs operating in the Gulf of Mexico.