A thunder storm warning is also effect for 25 counties.
Met Éireann has issueed a status orange rain warning for four counties.
The alert is in place in Londford, Leitrim, Cavan and Roscommon until 6pm this evening, with 50 millimetes of rain possible - which may lead to some flooding.
Seperately, a status yellow thunderstorm is in effect across 25 counties on the island, which runs until 9 o'clock tonight.
The national forecaster is forecasting heavy downpours of rain, and a change of localised flooding.
