MET Eireann has issued a Status Orange wind warning for Donegal, Leitrim, Mayo and Sligo, and a yellow rainfall warning for Connacht and a number of Munster counties, including Cork.
As Storm Gareth approaches, westerly winds will reach mean speeds of 65 to 75km/h, primarily in the north west of the country, with damaging gusts reaching 110 to 130km/h. There is also the risk of coastal flooding due to high seas.
There is a Status Yellow rainfall warning for Connacht, Donegal, Clare, Cork, Kerry and Limerick in operation from 6pm today until 6am tomorrow.
Heavy rain, followed by squally showers, will lead to the risk of rainfall accumulations of around 25mm in these areas.
There is also a Status Yellow wind warning for all of Ireland from noon tomorrow until 12 noon on Wednesday.
Westerly winds will reach mean speeds of 50 to 65km/h and gusts of 90 to 110km.
There is a risk of coastal flooding due to high seas along Atlantic coasts.
For more see met.ie