Severe and destructive winds are promised.
Met Éireann has issued a status red wind warning for Cork ahead of the arrival of Storm Ellen.
The warning was issued on Wednesday morning and is valid from 9pm until midnight.
Met Éireann has said Storm Ellen will produce a core of very severe and destructive winds during these hours.
A red gale warning is also in place for gale to storm force winds, southeast veering southwest, this evening and tonight on all Irish coastal waters and on the Irish Sea.
Winds will reach violent storm force 11 for a time on coasts from Carnsore point to Valentia to Slyne Head.
A status orange wind warning is in place for Galway, Mayo and Munster while the rest of Ireland is covered by a status yellow wind warning.
The orange warning will expire at 12pm on Thursday while the yellow warning is in place until midnight on Thursday.
Met Éireann has said Storm Ellen will bring unseasonably wet and stormy weather and formed from the remnants of Hurricane Kyle.
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