Maximum sustained winds are near 105 miles per hour (165 km/h) with higher gusts.
Oscar is forecast to continue to strengthen through Monday night, then gradually weaken in the open Atlantic.
Tropical Storm Oscar became Hurricane Oscar, officials with the National Hurricane Center said on October 28. As of 10 p.m., the National Hurricane Center said Oscar was centered some 660 miles southeast of Bermuda and 645 miles northeast of the northern Leeward Islands and moving west at 16 mph.
Oscar is the 15th named storm this season, the 7th storm to be subtropical.
Forecasters at the Miami-based hurricane center say Oscar has slowed down as it starts to turn north. Oscar is moving to the west at 16 miles per hour.
No coastal watches of warnings are in effect. According to a forecast discussion, Oscar is moving over "sufficiently warm water" that would help make it stronger.
The Atlantic hurricane season runs from June 1 to November 30 each year, while the Eastern Pacific hurricane season runs from May 15 to November 30, the center said.
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