A status yellow rain warning will come into effect in Kerry on Friday.
The warning lasts for eight hours, from 4pm Friday until midnight, coinciding with the first day of the Rose of Tralee International Festival.
It applies to all of Munster, all of Leinster, and Galway.
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Met Éireann says heavy rain with thundery downpours are forecast, with difficult travelling conditions and spot flooding also possible.
