Both Northern Ireland and the Republic of Ireland are under the top-level red weather warnings for wind from early on Friday.
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.
Ireland's national weather service says the country has seen 114 mph wind gusts, the highest ever recorded on the island.
There are warnings of danger to life, fallen electric lines, damaged infrastructure and widespread power outages
More rainy and windy weather battered the U.K. and Ireland on Sunday, with a gust of 82 mph (132 kph) recorded at Predannack in southwest England. It was part of a new system named Storm Herminia by weather authorities in Spain, which was bracing for severe impact.
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ESB Networks in Ireland and NIE Networks say they expect significant further outages as Storm Eowyn continues to batter parts of the island.
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Almost one million homes, farms and businesses in the Republic and Northern Ireland are without power as record-breaking wind speeds swept across the island.
Thousands are still without power across the island of Ireland after Storm Eowyn swept in strong gusts that damaged buildings and blocked roads. The focus will turn to the clean-up effort as weather warnings lift, freeing workers to reconnect power supplies and clear debris.