Updated at 11:40 p.m. ET

Hurricane season isn't through with us yet.

After Harvey, Irma and Maria wrought their destruction in quick succession, inundating southeast Texas and steamrolling much of the Caribbean, another big storm has taken shape in the Atlantic Ocean: Ophelia. Only this time, the post-tropical cyclone that peaked as a Category 3 hurricane over the weekend is sweeping eastward, heading toward the British Isles, where it's expected to make landfall on Monday.

Even though it has weakened significantly since Saturday, Ophelia is expected to bring hurricane-force winds to Ireland on Monday.

"This will be a significant weather event for Ireland with potentially high impacts — structural damage and flooding (particularly coastal) — and people are advised to take extreme care," Met Éireann, the Irish meteorological service, said in a statement Saturday.

As of late Sunday, the U.S. National Hurricane Center said Ophelia packed maximum sustained winds of about 85 mph. The service expected the storm to continue to weaken over the next 24 to 48 hours as it churned over colder waters on its way to Ireland and the U.K.

Still, the storm has already made history. As noted by Philip Klotzbach, meteorologist at Colorado State University, Ophelia reached Category 3 status Saturday — making it "the farthest east (26.6W) an Atlantic major hurricane has existed on record" before it weakened to a Category 1 storm on Sunday.

Met Éireann attributedthe hurricane's unprecedentedly strong eastward lurch to "exceptionally warm temperatures in western Europe."

Despite Ophelia's diminishing status, authorities have been sparing few precautions. Officials have issued a red warning and closed schools throughout at least eight counties in Ireland, according to the BBC. And Irish Prime Minister Leo Varadkar tweeted Sunday that defense forces are being deployed to those areas, as well.

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