Met Éireann has raised their orange alert to a red alert.
They said the warning will be in effect until 3pm tomorrow.
It has been forecast to become very stormy this evening with gale force winds from this evening and through most of tomorrow.
The forecaster says winds will increase to between 55 and 75 kilometres per hour, with gusts of 90 to 120 kilometres per hour and 140 kilometres per hour in some coastal areas.
Very high seas are also expected bringing significant danger of coastal flooding.
Ferry services are cancelled due to the high winds today and Irish Ferries have cancelled all of their Swift sailings for tomorrow.
Motorists are being urged to slow down as black ice appears on some roads, particularly on the Dublin to Cork road between junction 6 Thurles and junction 16 Rathcormac.
Roads in Cork City are also icy.
Airports are reporting no major delays, but passengers on all transport should check with their travel provider prior to departure.