ST. PETERSBURG, Fla. — Tropical Storm Sally formed Saturday off south Florida, becoming the earliest 18th-named storm on record in an Atlantic hurricane season as it enters the Gulf of Mexico amid signs of strengthening further.

In the National Hurricane Center’s 5 p.m. forecast, meteorologists said a hurricane watch is in effect for metropolitan New Orleans. The watch extends from Grand Isle, Louisiana, to the Alabama-Florida line, including Lake Pontchartrain and Lake Maurepas in Louisiana and greater New Orleans.

Forecasters said a life-threatening storm surge is possible along parts of the Gulf Coast beginning Monday.

Sally emerged from a tropical depression swirling off south Florida, headed Saturday into warm Gulf waters. It was expected to become a hurricane by late Monday that could threaten a wide swath of the northern Gulf coast early in the week. It becomes the earliest 18th named storm in a busy tropical season, beating Stan, which formed on Oct. 2, 2006.

On Saturday afternoon, gusty winds and heavy rain swept through South Florida due to Sally.

The National Hurricane Center said Sally would dump heavy rain around the Florida Keys and the southern and western parts of the state. Maximum sustained winds were clocked at 40 mph with higher gusts. Additional strengthening is expected over the coming days.

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An Air Force Hurricane Hunter plane was scheduled to investigate the system late Saturday.

“Since the system will be traversing very warm waters and through a moist air mass with moderate vertical shear for the next few days, steady strengthening is anticipated,” forecasters wrote in an earlier advisory.

Sally was located 30 miles south-southeast of Naples on Saturday afternoon, according to the hurricane center. The system was moving to the west at 7 mph.

The storm is expected to bring 2 to 4 inches of rain to parts of Florida, with isolated totals up to 6 inches. Meteorologists warn of an increasing risk of life-threatening storm surge and dangerous hurricane-force winds from southeastern Louisiana to the Alabama coast.

Meanwhile, Tropical Storm Paulette had maximum sustained winds of 70 mph and was 460 miles southeast of Bermuda, where a hurricane watch and tropical storm warning are in effect. Forecasters said Paulette would become a hurricane later Saturday and drop up to 6 inches of rain on the territory through Monday, adding that it is expected to be a “dangerous hurricane” when it is near Bermuda on Sunday night and Monday.

Tropical Storm Rene weakened in recent hours and was reclassified as a tropical depression. It had maximum sustained winds of 35 mph and was about 1,200 miles east-northeast of the Northern Leeward Islands. Forecasters said Rene wasn’t expected to strengthen and did not pose any threat to land.


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