A status yellow rain warning has been issued across the country.
Met Iron says it will continue to rain heavily from tonight until Tuesday evening.
Although some areas will be below the warning level, the forecast said there is a possibility of flash floods in mountainous areas and more localized areas.
The warning is valid from midnight today until 7pm on Tuesday.
– Met Éireann (etMetEireann) October 18, 2020
Met Iron, a climate adviser for Ireland, says unusually high tides with strong winds increase the risk of flooding the coast.
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The UK Met Office has issued yellow rain warnings for the counties of Dun, Armag, Tyrone, Derry and Fermanagh.
The warning is valid from 5am tomorrow until 3am on Tuesday.