Minister of State Patrick O'Donovan is warning those along the Shannon in particular.
The Minister with responsibility for flooding says communities along the Shannon need to particularly alert over the next 48 hours.
A Status Yellow Warning for heavy rain's in place until 9pm tonight across Connacht, the midlands and north-west.
Met Eireann says up to 50 millimetres of rain could fall in places, and there's a risk of some rivers overflowing.
Minister of State, Patrick O'Donovan, says homes and businesses along the Shannon need to be especially wary:
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