It is this hurricane season's 15th named storm.
Subtropical Storm Oscar formed Friday evening in the open waters of the Central Atlantic Ocean. Oscar will be steered west until Monday when the storm system now impacting the U.S. East Coast blocks its progress.
The weather service said TS Oscars closest point of approach inside three days was expected to be 487 miles to the east south east of the island about 5am on Tuesday.
Forecasters at the Miami-based hurricane center say Oscar "is expected to accelerate quickly toward the northeast through the middle of the week".
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"A continued westward motion is anticipated today, followed by a turn toward the northwest late tonight or early Monday".
There are no coastal watches or warnings in effect, according to the agency.
Oscar has become the eighth hurricane of the 2018 Atlantic season, but the storm is far out in the Atlantic where it poses no threat to land. Tropical-storm-force winds extend outward up to 115 miles from the center.
During the afternoon on Thursday, shower activity associated with the low pressure system became more concentrated.