The National Hurricane Center in Miami said Saturday morning that Oscar was centred about 1,040 miles (1,675 kilometres) east-southeast of Bermuda, and it was moving west at 13 mph (20 kph).
Hurricane Oscar has gained strength in the Atlantic Ocean and should get even stronger, forecasters said Monday. Hurricane-force winds extend outward up to 15 miles from the center and tropical-force winds extend outward up to 70 miles, the NHC said.
Maximum sustained winds have increased to near 50 miles per hour with higher gusts.
NHC forecasters say that a westward to west-southwestward motion with an increase in forward speed is expected today and tonight, followed by a reduction in speed on Sunday.
Oscar is forecast to continue to strengthen through Monday night, then gradually weaken in the open Atlantic. The Atlantic hurricane season ends on November 30, but it usually peaks on September 10-11. "On a rare occasion, storms that form near the Central America coast can track north into the Gulf of Mexico and turn to the northeast toward Florida", it stated.