The storm had top sustained winds of 70 miles per hour (110 kph). 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).
According to the National Hurricane Center, additional strengthening is forecast during the next several days, and Oscar is expected to make a transition to a tropical storm on Sunday.
Tropical Storm Oscar continues to swirl in the Atlantic, but does not pose a threat to land. Then, Oscar is forecast to begin moving toward the north Monday night or Tuesday, and then head northwest away from the United States by Wednesday. Oscar is moving to the west at 16 miles per hour.More news: Muncy revives Dodgers' World Series hopes with epic moment
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Tropical Storm Oscar could become a hurricane later today.
The Atlantic hurricane season typically peaks in September and October, but major storms do sometimes form in November.
If Oscar becomes a hurricane it will be the eighth so far this season, which will come to a close on November 30.