"Ophelia is expected to transition to a hurricane-force post-tropical cyclone by Monday when it moves near Ireland and the United Kingdom", the NHC said.
Ophelia became a hurricane on Wednesday, becoming the 10th hurricane in the Atlantic in 2017.
The hurricane season has seen a series of strong, destructive storms that have wreaked havoc across the Caribbean as well as in the U.S. states of Texas and Florida.
It is now around 760 miles south-west of the Portuguese Azore islands, whipping up 75mph winds as it trundles eastwards. It actually has happened four times (in 1878, 1886, 1893 and 2017), but named storms were much more likely to be hurricanes back in the 1800s because a lack of satellites and other technology meant only the strongest storms and those making landfall would be noticed.
While rare, it is not unprecedented to have post-tropical storms reach the British Isles. Ophelia nears and could potentially impact Ireland, Northern Ireland, and Scotland as it lifts north on Monday.
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It will coincide with the 30th anniversary of the Great Storm of 1987, which hit southern England overnight on October 15.
In weather terms however, it is still too early to say for definite whether this storm will impact Ireland to the forecasted strength as predicted, but as for now, it's current path suggests this will be a major weather event.
Western Britain will also likely be battered by gusts of between 60mph and 70mph.
But he added: "It's definitely something that we are keeping an eye on, for the possibility of some disruptive weather early next week".