Gulf Coast residents hunkered down at home and in shelters Monday as a rare late-season tropical storm headed their way, bringing with it the potential for high winds, flooding and up to 8 inches of rain in some places.

After a quiet Atlantic storm season, people took the year's first serious threat in stride.

"We can ride it out right here," said T.J. Covacevich, 50, who wore a "Hurricane Hunter" T-shirt as he tied down his powerboat in a Biloxi, Miss., harbor.

Earlier, heavy rain in Ida's wake triggered flooding and landslides in El Salvador that killed at least 130 people.

Ida had been the third hurricane of this year's Atlantic season, which ends Dec. 1, but weakened to a tropical storm Monday, with maximum sustained winds near 70 mph (110 kph).

The U.S. National Hurricane Center said it was expected to weaken further before making landfall along the Gulf Coast sometime Monday night or early Tuesday. Rain was already falling in many spots by Monday afternoon.

Tropical storm warnings were in effect across Louisiana, Mississippi, Alabama and Florida, where governors declared states of emergency.

Florida Gov. Charlie Crist said officials were relieved Ida had weakened but warned that tropical storms can still be deadly. He pointed to Fay, which was blamed for more than a dozen deaths in Florida, Haiti and the Dominican Republic last year.

"That thing was a tropical storm and we lost a lot of our fellow Floridians, so it's important to stay vigilant," Crist said outside the state emergency operations center. "We need to be careful."

Residents elsewhere in the Southeast braced for heavy rain. In north Georgia, which saw historic flooding in September, forecasters said up to 4 more inches could soak the already-saturated ground as Ida moved across the state.

Two Chevron Corp. workers had to be rescued early Monday from an offshore oil rig about 80 miles south of New Orleans that was in danger of toppling as Ida churned up high seas. They were not hurt.