The Met Office has warned of “potential danger to life” as the remnants of Hurricane Ophelia head for the British Isles with 80mph (130km/h) winds.
An amber warning for Northern Ireland, west Wales, south west Scotland and the Isle of Man is in force from midday.
In the Republic of Ireland, Met Eireann has issued a red wind warning and the government has deployed the army.
The BBC’s Ireland correspondent, Chris Page, said it would be the most severe storm to hit Ireland in half a century.
Met Eireann has recorded gusts of 92mph (148km/h) at Fastnet Rock, off the south coast of Ireland.
Ophelia is on its way from the Azores in the Atlantic Ocean and it comes 30 years after the UK’s Great Storm of 1987.
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