Nov. 10 (Bloomberg) -- Storm Ida blew ashore on the U.S. mainland today and immediately deflated, its winds dropping to 35 mph as the National Hurricane Center discontinued all warnings.

The system, which at its peak was a Category 2 hurricane, is located about 30 miles (50 kilometers) east-southeast of Mobile, Alabama, after making its second landfall at 7 a.m. New Orleans time. Ida first went ashore on Dauphin Island, Alabama, in the Gulf of Mexico, at about 5:40 a.m.

“Ida has lost tropical characteristics and its winds are expected to slowly diminish during the next day or so,” the hurricane center said in a statement. “Water levels along the northern Gulf Coast should gradually begin to subside during the day.”

Ida was the first storm of the 2009 Atlantic hurricane season to affect energy facilities in the Gulf, with companies evacuating workers and idling 29.6 percent of oil and 27.5 percent of natural gas output, the federal government said. It was the third hurricane and ninth named storm of the season, which runs from June 1 to Nov. 30.

Ida formed in the southwestern Caribbean Sea on Nov. 4, and swept across Nicaragua and Honduras. Its highest winds were 108 mph on Nov. 8.

Initial reports blamed Ida for the deaths of at least 130 people in El Salvador over the weekend. The storm that caused the Salvadoran flooding actually was a Pacific system and Ida wasn’t to blame, Dennis Feltgen, a hurricane center spokesman, said by e-mail.

To contact the reporter on this story: Brian K. Sullivan in Boston at bsullivan10@bloomberg.net;

Last Updated: November 10, 2009 10:26 EST