Storm Ashley is "likely" to bring a "danger to life" to millions of Britons today, with coastal areas particularly threatened.
Yellow weather warnings are in place for the whole of Scotland, the north-west of England, the south-west of England and areas of Wales.
Meanwhile, a more serious Amber weather warning is in place for the north-west of Scotland, where the worst of the conditions are likely to be.
The Met Office has put the Amber warning in place from 9am to midnight and said that "injuries and danger to life" are "likely from large waves and beach material being thrown onto coastal roads, sea fronts and properties".
Met Office meteorologist Dan Stroud said "very strong, severe gales" on Sunday would meet high spring tides, which could bring in "very large waves" as a result.
The yellow weather warning for wind will remain in place in Scotland until 9am on Monday.
The separate yellow weather warning in England and South Wales is in place until noon, however strong winds could persist into Monday, bringing with it "fallen debris and trees.
Meteorologist Ellie Glaisyer said: "Parts of western Scotland could see gusts of 70-80mph during the afternoon.
"It will turn drier and brighter across much of England and Wales with some sunny spells during the afternoon."
The Environment Agency's website has listed 41 active flood warnings for Sunday morning, with 132 flood alerts.
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