Tropical Depression #4 formed in the Atlantic Ocean overnight and was quickly upgraded to Tropical Storm Dorian on Wednesday morning, the National Hurricane Center said.
Forecasters say Dorian is moving across the eastern Atlantic and remains far from land.
The storm's maximum sustained winds Wednesday were near 50 mph (85 kph). The U.S. National Hurricane Center in Miami says it is moving quickly across the Atlantic at 20 mph (32 kph).
The storm is centered about 500 miles (805 kilometers) west of the Cape Verde Islands, off the coast of west Africa. Dorian could get a bit stronger Wednesday, though it is forecast to weaken some on Thursday as it moves over cooler water.
If it does stick around, it will be near Puerto Rico by Monday.
Of course we are tracking it for you and will have updates throughout the week.