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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The Met Office said there was a “good chance” Northern Ireland could be hit on Monday afternoon by power cuts, flying debris, large waves in coastal areas and disruption to all travel services.
A yellow warning of “very windy weather” also covers parts of Scotland, the west and north of England and Wales.
Met Eireann meteorologist Joanna Donnelly told BBC Breakfast that “hurricane-force winds” were expected and the “real impact” for the Republic of Ireland will be about midday.
The BBC’s Chris Buckler said about 5,000 homes are without power in the Republic of Ireland.
Many ferries, trains, buses and flights across the island have been cancelled.
Dublin Airport said while early morning flights were operating as normal, up to 130 flights are expected to be cancelled when the storm hits later.
Belfast Airport said flights were scheduled to operate as normal, but passengers should check with their airline.
Ryanair, Aer Lingus, British Airways, Qatar Airways, Air France, CityJet, Emirates and KLM have all cancelled some flights due to the severe weather.
Northern Ireland’s Department of Education said all schools were closed, in an “entirely precautionary” measure.
All schools and colleges in the Republic of Ireland, where “violent and destructive gusts” are forecast, are also shut.
The Department of Education and Skills said the decision had been made “following discussions with members of the Government Task Force on Emergency Planning and in light of the advice from Met Eireann on this unprecedented storm.”
Northern Ireland’s chief justice has advised the judiciary that all courts should finish by 12:30 BST.
Ireland’s Taoiseach Leo Varadkar said defence forces were being sent to red weather alert areas – including Wexford, Galway, Mayo, Clare, Cork, Kerry, Limerick and Waterford.
It has been downgraded to a category one hurricane by the US National Hurricane Center and is forecast to continue gradually weakening.
Three battalions of soldiers – 1,200 personnel in total – are on permanent standby to deal with major incidents in the UK, but the Ministry of Defence said no specific requests had yet been made of them by local authorities.
The Republic of Ireland’s Met Office predicts coastal areas will be hit by winds in excess of 80mph (130km/h) from 09:00 BST on Monday until Tuesday and is warning against unnecessary travel.
Gerald Fleming, head of its general forecasting division, told Irish broadcaster RTE: “The track is very consistent [and] has been for days.
“The strongest winds [will be] along the south coast.
‘Huge contrasts’
“That’ll be tomorrow morning, and it’ll track up the centre again, going up along the western part of the country.”
BBC Weather said Monday would be a “day of huge contrasts” with the strong gusts of wind travelling over the Irish Sea and heading north to central and southern Scotland, sparing eastern parts of the UK.
Eastern England is instead expected to enjoy unseasonably warm weather, with temperatures of 22C or 23C on Monday – compared with an average for mid-October of 15C.
Highs of 24C were recorded in the region on Saturday as some parts of the country basked in a “mini heatwave” thanks to warm air brought by Hurricane Ophelia.
Ophelia set the record for the most easterly category three hurricane in the Atlantic.
Category three hurricanes are defined as having wind speeds of between 111mph (179km/h) and 129mph (208km/h) and can cause major damage to well-built homes.
Source: http://bbc.in/2hIKQOr
