Met Éireann has issued a status red weather warning for Connacht, Donegal, Clare and Kerry.
It warns of incessant falls of heavy rain overnight and for all of Saturday as Storm Desmond hits the country.
As much as 70mm of rain is expected to fall over this period, and even more on higher ground, the forecaster said.
The warning is valid from 6pm tonight to 3am on Sunday morning.
Becoming windy as Storm Desmond feeds in incessant falls of rain. The rain will reach the W & NW this aft extending countrywide this eve….
— Met Éireann (@MetEireann) December 4, 2015
Status orange and yellow warnings are in place across the country.
The Irish Coast Guard is calling for to use common sense and stay away from headlands, piers and cliffs that produce heavy spray.
The spray can be replaced by a life-ending wave in a blink of an eye.
“Before the storm gathers the Coast Guard is preparing to undertake a long range mission out to the southwest to medevac a critically ill crewman off a merchant vessel before the big seas hit. Best of luck,” the Facebook post concluded.
Here’s a full breakdown of all weather warnings in place:
Status red rainfall warning for Connacht, Donegal Clare, and Kerry
Incessant falls of heavy rain overnight and for all of Saturday. Accumulations in excess of 70mm expected, with greater totals on higher ground. Valid from 6pm tonight to 3am Sunday morning.
Status orange wind warning for Donegal, Galway, Leitrim, Mayo and Sligo
Southwest winds with mean speed of 55 to 75 km/h will gust 100 to 120 km/h. Winds will be strongest for coastal areas. Valid from 9am today to 6pm Saturday.
Status orange rainfall warning for Cavan, Clare, Cork and Limerick
Incessant falls of heavy rain overnight and for all of Saturday. Accumulations of 50 to 70mm expected. Valid from 9pm tonight to 3am Sunday morning.
Status yellow wind warning for Leinster, Cavan, Monaghan, Roscommon, Cork, Kerry, Limerick, Tipperary and Waterford
Southwest winds with mean speeds of 50 to 65km/h will gust 90 to 100km/h. Valid from 3pm today to 9pm on Saturday.
Status yellow rainfall warning for Leinster, Monaghan, Tipperary and Waterford
Heavy rain tonight and all day Saturday. Rainfall totals of 30 to 50 mm. Valid from midnight tonight until midnight Saturday.
To follow progress live, follow Met Eireann on Twitter: https://twitter.com/MetEireann