Storm Lorenzo is expected to bring winds of up to 130 kilometres an hour to some western coastal counties later.
A yellow warning for wind and rain will take effect nationally from nine this morning, while an orange wind alert for western counties will begin this evening.
Mayo, Galway, Clare, Kerry and Limerick are forecast to be worst affected.
Damaging gusts and heavy rain are expected over the course of the day with coastal flooding likely in places.
The worst of the conditions will be along the western seaboard as storm lorenzo sweeps in.
People are being told to keep up-to-date with their local authority.
Airports are warning passengers to check for any flight disruption before travelling to the airport.
Schools are also being advised to err on the side of caution when deciding whether or not to open.
The National Emergency Co-Ordination Group is to meet again later this morning to finalise preparations.