Ireland's national weather service says the country has seen 114 mph wind gusts, the highest ever recorded on the island.
One of the strongest storms in decades leads to cancelled flights, suspended rail services, and closed schools.
Two red weather warnings are in place as winds of up to 100mph are forecast to hit Northern Ireland and Scotland.
Ireland has been hit with record wind gusts of 114 miles (183 kilometers) an hour as a winter storm batters the country and northern parts of the U.K. Schools have been closed, trains halted and hundreds of flights canceled in the Republic of Ireland,
Record high winds from Storm Eowyn battered Ireland and Northern Ireland on Friday, leaving almost one-third of Irish homes and businesses without power and forcing cancellation of hundreds of flights and the closure of schools and public transport.
ESB Networks in Ireland and NIE Networks say they expect significant further outages as Storm Eowyn continues to batter parts of the island.
There are warnings of danger to life, fallen electric lines, damaged infrastructure and widespread power outages
More than 93,000 homes and business in Northern Ireland are currently without power, NIE has confirmed. Dozens of flights have also been cancelled at Belfast airports this morning as high winds from Storm Éowyn begin to batter Northern Ireland.
A powerful storm has left hundreds of thousands of homes without power and caused massive travel disruptions in the United Kingdom.
The storm had knocked out power to more than half a million utility customers by early Friday as it moved across Ireland.
Storm Éowyn is slowly making its way across the UK, where its heavy winds have been hitting homes and commercial properties. In Northumberland, one bungalow had its roof torn off, while Bangor leisure centre in Northern Ireland - which is under a red wind warning - also suffered damage.
A red wind warning has been issued for the whole of the Republic of Ireland, with Met Éireann warning of a possible "danger to life". The alert comes into effect at varying times from 02:00 on Friday and will end at varying times. Met Éireann has warned that "severe, damaging and destructive winds" are expected, with gusts of up to 130km/h.