A record wind speed of 114mph has been recorded in Ireland as Storm Eowyn causes widespread disruption on both sides of the Irish Sea.
Red warnings for wind cover the entirety of Ireland and parts of Scotland as the storm brings staggering winds that pose a danger to life.
Trains and flights across the UK face cancellation or disruption on Friday, while schools in Northern Ireland and central and southern Scotland have been urged to shut.
Hundreds of flights have been cancelled today, including about 230 to and from Dublin Airport.
Flight cancellations were also reported at airports in Glasgow, Edinburgh, Manchester, Newcastle and Liverpool.
Around 4.5 million people in parts of Northern Ireland and Scotland were sent an emergency alert on their mobile phones on Thursday evening.
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Reporting from Ireland’s ‘worst storm ever’
Ireland and Northern Ireland
An “unprecedented” number of homes in Ireland have already lost power, with electricity provider ESB Networks reporting the storm has already affected 715,000 homes, farms and businesses – a huge number so early on in this weather event.
In Northern Ireland, more than 93,000 homes and businesses are currently without power, NIE Networks has said, with the storm causing “widespread damage” to the electricity network.
Bus and train services have been suspended in Northern Ireland.
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A string of public authorities have warned the public to travel only if absolutely necessary and National Rail has advised passengers to check for travel advice before travelling.
All trains are suspended in Scotland, while bus and train services have also been suspended in Northern Ireland.
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Emergency phone alerts for Storm Eowyn
Some health services have also been suspended, with NHS Lothian cancelling all routine, non-urgent planned procedures on Friday and postponing the majority of hospital outpatient appointments to protect patients and staff.
NHS Lanarkshire has also postponed all non-urgent appointments in hospital and community settings.