The storm was upgraded to a category one hurricane last night and is taking an unpredictable path across the Atlantic.
Hurricane-force winds extend outward up to 25 miles from the center and tropical-storm-force winds extend outward up to 70 miles.
Hurricane Ophelia is now raging at 90mph over the northeastern Atlantic and could strengthen further over the next couple of days, according to the NHC.
"There is a lot of uncertainty as to the exact evolution and movement of this weather system during the coming four days, but storm-force winds, outbreaks of heavy rain, and very high seas are threatened".
Hurricane season runs from June 1 through November. It is much less likely to make landfall than storms in September, however.
The fact that 10 consecutive storms have reached hurricane status speaks to the unrelenting nature of the 2017 Atlantic hurricane season.
Ophelia will get caught in the "westerlies", the jet-stream-powered flow that moves mid-latitude weather from west to east, over the weekend as it passes Portugal and Spain and heads towards Ireland.
Hurricane Ophelia on Thursday morning (Oct. 12) was slowly moving through the Atlantic Ocean toward the Azores and Ireland.
While rare, it is not unprecedented to have post-tropical storms reach the British Isles.
Farther to the east, Ireland and the United Kingdom are also watching Ophelia's track, which could bring hurricane conditions to some areas there early next week.