Met Éireann has issued a Status Orange weather warning for four counties as Storm Hannah moves in, with the forecaster urging people to be prepared for "possible disruption and power outages".
A Status Orange wind warning will come into effect tomorrow afternoon for Clare, Cork, Kerry and Limerick.
The forecaster is warning of strong winds and stormy conditions.
It has said southerly winds will reach gusts as high as 130km/h, and urged people to be ready for disruption.
The warning will remain in place from 4pm tomorrow until 5am on Saturday.
A Status Yellow wind warning has also been issued for Connacht, Carlow, Kildare, Kilkenny, Laois, Longford, Wexford, Wicklow, Offaly, Donegal, Tipperary and Waterford.
That warning will come into effect from 11pm tomorrow night through to Saturday morning.
Met Éireann has said southerly winds will bring gusts of up to 110km/h.
This chart shows forecast pressure and precipitation every 6 hours for 7 days. pic.twitter.com/0ngp8Qbbxr— Met Éireann (@MetEireann) April 25, 2019
The Road Safety Authority has asked road users to exercise caution during the weather.
It has urged road users to be aware of objects being blown out onto the road, and to expect the unexpected.
Drivers are advised to allow extra space between themselves and other road users such as cyclists.
National traffic: Storm Hannah plans to visit Clare, Cork, Kerry and Limerick this Friday evening and overnight. Please take care on roads as high winds are forecast in many areas. Plan your journey in advance and allow plenty of time to travel. #StaySafe #ArriveAlive pic.twitter.com/wun5NSkwoY— An Garda Síochána (@GardaTraffic) April 25, 2019
Speaking on RTÉ's News at One, John Eagleton said the storm will produce strong winds around southwest Munster tomorrow evening.
He said it will track across the country from Clare before clearing Ireland over Wexford at around midnight.
Mr Eagleton said that strong northwesterly winds are likely as the storm leaves Ireland.
Meanwhile, the UK Met Office said strong winds are also expected in southern parts of the UK, but the storm will affect Ireland most significantly.
It said that Met Éireann had chosen to name the storm based on its own criteria and the potential impacts for Ireland.
A spokesman said the Met Office itself would probably not have gone as far as naming the system, which has come from the Atlantic, but it will be issuing its own warnings.