A status yellow thunder warning is now in effect across much of the country - including counties Galway, Roscommon, Sligo and Leitrim.
Met Eireann is forecasting scattered thunderstorms through this afternoon and evening, with heavy downpours of rain, and a risk of localised flooding.
The alert is in place until 9pm tonight.
And a more severe status orange rainfall warning is in place for Roscommon, Leitrim, Longford and Cavan, with intense thundery downpours today that will lead to surface flooding.
That warning is in place from noon until 6pm this evening.