University of Miami hurricane researcher Brian McNoldy says Ophelia is the 10th straight tropical storm to become a hurricane in an Atlantic season.
The storm was upgraded to a category one hurricane on the night of Wednesday October 11 - making it the tenth hurricane of the 2017 Atlantic season. Ophelia remains well away from any landmasses at the present time.
The storm had winds of 120 kilometers an hour and was located some 1,200 kilometers south-west of the Azores, where it posed no immediate danger to land, the hurricane center said.
A hurricane brewing over the Atlantic threatens to bring strong winds on Monday - and a mini-heatwave.
The US National Hurricane Centre has warned it could strengthen over the next day or so.
A hurricane is headed for the United Kingdom - and it's due to hit on the 30-year anniversary of the 1987 Great Storm.
Forecaster Eleanor Bell, of The Weather Channel, said: "Latest model guidance is indicating Ophelia will move in from the Azores across the Biscay area around Sunday and move on towards Britain early next week".
The last time so many named storms in a row became hurricanes was in 1893, he said. Hurricane-force winds extend outward up to 25 miles from the center and tropical-storm-force winds extend outward up to 70 miles.