Large areas of the west and midlands remain underwater this morning, with the Defence Forces on standby to help out.
Roads in parts of south Mayo, Galway, Roscommon and Sligo are closed, and diversions are in place.
Tipperary is also badly affected, with roads closed near its borders with Galway and Offaly.
There are also concerns over extensive flooding on the Dublin to Sligo rail line with Irish Rail warning that the service could be suspended as a result of rising flood waters in the Carrick on Shannon and Dromod areas.
Meanwhile, a status yellow snow/ice warning is in place until midday for Donegal, Leitrim and Sligo.