As the storm passed near the Azores archipelago on Saturday it was classed Category 3, which means it packed winds of at least 178 kilometres (110 miles) per hour.
Though cooler seas will weaken the storm as it churns towards the west coast of Ireland, it still has enough power to damage buildings and provoke “dangerous” sea conditions as well as potential flooding, Irish authorities said.
Meteorologists say Ophelia is the most powerful hurricane recorded so far east in the Atlantic and the first since 1939 to travel so far north.
It is the 15th named storm of the 2017 Atlantic season, which is expected to last until the end of November.
Three major hurricanes — Harvey, Irma and Maria — caused catastrophic damage in the Caribbean and the US Gulf Coast.
By the time Ophelia reaches Ireland on Monday it is expected to weaken to a “post tropical storm” with severe winds and stormy conditions, according to the US National Hurricane Center.
Ireland’s Met Eireann national weather service has issued a “status red” alert for eight western and southern counties, warning of severe winds and stormy conditions.
“Mean wind speeds in excess of 80 kph (50 mph) and gusts in excess of 130 kph (80 mph) are expected, potentially causing structural damage and disruption, with dangerous marine conditions due to high seas and potential flooding,” it said.
All schools in areas affected by the red wind alert are to close on Monday.
Flights, ferries and buses all face disruption. Cork Airport in southwest Ireland said “cancellations are likely” and urged passengers to check with their airlines in advance of travel.
After skirting up the Irish coast, the eye of the storm was forecast to cross Scotland.
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