(CNN) -- Katia strengthened into a hurricane late Wednesday, churning in the central Atlantic with winds of 75 mph, the National Hurricane Center said.
At 11 p.m. ET, the Category 1 storm -- the second hurricane of the Atlantic season -- was about 1165 miles (1,875 kilometers) east of the Leeward Islands, spinning to the north-northwest at 20 mph.
Additional strengthening is forecast during the next 48 hours and Katia could become a major hurricane by the weekend, the hurricane center said.
The extended forecast map shows the storm passing north of the Caribbean.