Stormy weather is being experienced in various parts of the country.
Earlier Met Éireann issued two severe weather warnings.The most severe weather warning - code red - has been issued for counties Clare, Galway, Kerry, Mayo, Waterford and Wexford.
The warning is expected to remain in place until 3pm on Friday.
It is very windy with gusts as high as 150km-ph in some places.
There is also significant danger of coastal flooding.
ESB Networks said crews were working to restore power to approximately 14,000 customers, mainly in counties Cork, Louth and Cavan, following storm damage to the electricity supply.
Power outages have been reported in Cork, Kerry, Clare, Leitrim, Roscommon, Offaly, Westmeath, Meath, Louth, Wicklow and Dublin.
Weather conditions across Co Cork are described as "ferocious".
There are reports of fallen trees or power lines and excess surface water on roads across a number of counties, including Waterford, Meath, Louth, Leitrim, Sligo, Tipperary, Mayo, Cork and Clare.
AA Roadwatch has described driving conditions on the M7 Dublin to Limerick motorway between Roscrea and Limerick as treacherous.
There is some minor flooding on roads, but fallen trees are causing the greatest hazard to drivers.
Gardaí are urging people to drive with extreme caution.
Three units of the fire service are responding to a call at Cork University Hospital after high winds ripped part of the cladding from the facade of the cardiac renal unit.
The unit is currently unoccupied and there is no danger.
Irish Ferries has cancelled all its Swift sailings for Friday.
Two of the company's Cruise sailings on Friday have also been cancelled.
Stena Line has cancelled its 13.30 sailing from Dun Laoghaire to Holyhead.
Flights to and from Donegal Airport have been cancelled due to equipment failure at the airport after damage was caused to essential equipment by a lightning strike.
Engineers will be on site tomorrow morning and Airport management hope to have normal services resumed later in the day.
Ryanair have diverted one flight from Stansted to Shannon to Dublin Airport.
Passengers were taken from Dublin Airport by bus to Shannon Airport.
Aer Lingus flights EI386 Shannon to Heathrow and EI 387 Heathrow to Shannon have been cancelled.
EI386 Shannon to Heathrow passengers have been re-booked and EI387 Heathrow to Shannon passengers have been re-booked to EI177 Heathrow to Dublin with surface transport to Shannon.
Cork Airport says a number of flights may have to be diverted this evening due to storm force winds.
A short time ago a Ryanair flight from Wroclaw to Cork (Flight FR885) was diverted to Shannon Airport.
In Britain, the Environment Agency has warned of further significant disruption from flooding in parts of southern England with more heavy rainfall expected there today and tomorrow.
Many rivers are still swollen from storms earlier this week.
Almost 25,000 households are without electricity.
Power companies have warned that supply may not be reconnected until the end of the week.