Forecasters say more than 50 millimetres of rain will fall in parts of Munster today.
An orange weather warning is in place in Tipperary and Waterford until 6 o'clock this evening.
Spot flooding is also forecast in Kilkenny and Wexford, where there's a yellow warning until the same time.
Cathal Nolan from the Midland Weather Channel, says a very wet day lies ahead.
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