A weather warning has been issued for 10 counties with the west of Ireland set to be battered by heavy rain.
Met Eireann is forecasting "heavy and persistent" rain on Friday afternoon and overnight into Saturday.
Donegal, Clare, Cork, Kerry, Limerick and all counties in Connacht have been hit with the caution. The alert will be valid between 6am on Friday and 6am on Saturday.
A warning said: "Rain will turn heavy and persistent on Friday and Friday night bringing the risk of localised flooding.
"Rainfall totals of 30-50mm are expected during the period, higher in mountainous areas."
The national forecaster has warned of flooding as the torrential rain hits much of Ulster.
The eastern half of the country is expected to get more "patchy rain" as well as some dry periods during the day. Highs will range from 16C to 20C.
A forecaster said: "Outbreaks of rain will extend to most of the country on Friday.
"The rain will be heavy and persistent in west Munster, Connacht and much of Ulster with the risk of localised flooding.
"The rain will be patchier elsewhere with decent dry periods, especially in the southeast. Maximum temperatures ranging 16 to 20 degrees in fresh and gusty south or southwest winds."
A wet Friday night is in store for most of the country as the heavy rain continues to pour down.
The forecaster added: "Friday night will be very wet with persistent and heavy rain for a time.
"Winds will be light to moderate inland, southerly first and later westerly.
"Along south and east coasts it will be breezy for a time with fresh to strong southerlies. Lowest temperatures of 10 to 14 degrees."
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