Tropical Storm Karen has formed in the Gulf of Mexico, according to the National Hurricane Center.
As of 11 a.m. EDT, the storm was located about 65 miles northwest of Cabo Catoche, Mexico, and about 485 miles south of the mouth of the Mississippi River. Maximum sustained winds were 65 mph.
The storm was to the north-northwest at 12 mph.
The U.S. National Hurricane Center in Miami says the late-season storm formed Thursday morning.
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A hurricane watch was in effect from Grand Isle, La., to Indian Pass in the Florida Panhandle. A tropical storm watch also was in effect for parts of the Louisiana coast west of Grand Isle, including the metro New Orleans area and Lake Pontchartrain.
Karen could be at or near hurricane strength by Friday, according to the Hurricane Center.