http://www.cnn.com/2011/US/09/02/tropical.weather.gulf/index.html?npt=NP1
New Orleans (CNN) -- A slow-moving tropical system with the potential to douse summer-ending beach plans and bring up to 20 inches of rain and flooding to parts of the Gulf Coast continued to drift northward towards land Friday, the National Weather Service said.
Tropical storm warnings were up for the Gulf coast from Pascagoula, Mississippi to Sabine Pass, Texas.
The storm was barely moving Friday morning, inching northward at 1 mph. At 7 a.m. CT it was located 210 miles southwest of the mouth of the Mississippi River and had winds of 35 mph.
Although the system had not yet been officially declared a tropical storm Friday morning, the Weather Service said tropical storm-force winds were being reported at some oil rigs north and east of the storm's center and an upgrade could come later in the day.
Portions of southern Louisiana, Mississippi and Alabama could see 10 inches to 15 inches of rain by Sunday, with isolated totals of 20 inches, according to the National Hurricane Center.
New Orleans, much of which sits below sea level, is likely to see 8 to 10 inches of rain in the next few days, Mayor Mitch Landrieu told reporters.
"What we do know is there's high wind, there is a lot of rain and it's going slow," Landrieu said Thursday. "That's not a good prescription for the city of New Orleans should it come this way."
Louisiana Gov. Bobby Jindal declared a state of emergency. Some oil producers began evacuating employees.
BP and ExxonMobil asked workers to leave their Gulf rigs and shut down wells, according to company officials.
Chevron has ordered nonessential workers off the platforms, and Shell said it is taking some workers back to shore.
"Weather conditions are already impairing staff movement, but we are using all available resources to safely evacuate employees," Shell said in a statement. "The number of evacuated personnel will depend on weather conditions, and we will only transport personnel if safe to do so."
The storm is threatening to ruin the usually busy summer-ending Labor Day weekend for thousands of beach-goers. It's also brewing six years to the week after Hurricane Katrina came ashore, devastating portions Louisiana and Mississippi -- including New Orleans.
That city's mayor urged residents to be prepared and collect emergency items such as bottled water, batteries, nonperishable food, first-aid kits and family documents.
While they may not be needed this time, the region was entering an "active phase of the storm season," Landrieu said.
CNN's Dave Alsup and Vivian Kuo contributed to this report.