Karen should make landfall Saturday night somewhere along the U.S. Gulf Coast.

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Tropical Storm Karen has formed in the Caribbean, the National Hurricane Center reported Thursday morning, becoming the 11th named storm of the Atlantic hurricane season.

As of 8 a.m. ET, the storm had winds of 60 mph. It was located about 500 miles south of the mouth of the Mississippi River and was moving to the north-northwest at 13 mph.

There is a chance Karen becomes a hurricane before making landfall, reports AccuWeather. A tropical storm becomes a hurricane when its winds reach 74 mph.

Hurricane and tropical storm watches have been posted for the U.S. Gulf Coast from Florida to Louisiana.

A hurricane watch is in effect from Grand Isle, La., to Indian Pass, Fla., while a tropical storm watch is in effect for metropolitan New Orleans, Lake Ponchartrain and Lake Maurepas, as well as the Gulf Coast from west of Grand Isle to Morgan City, La.

A hurricane watch means that hurricane conditions are possible within the watch area, while a tropical storm watch means tropical storm conditions are possible.

The storm should make landfall somewhere along the Gulf Coast by Saturday night.