The forecaster expects the Storm to hit on Friday bringing Status Orange winds of up to 130kmph to some counties.
The weather assessment team at Galway city council have analysed the latest information from Met Éireann and the OPW Tide & Surge site and have been in contact with the Galway Harbour master.
The Met Office has said there could be flooding in parts of the United Kingdom, as well as nightmare travel conditions amid 70mph gales and sheet rain. The Welsh and Cornish coasts could have winds of 55mph, while along the coast of southern England gusts may reach 50mph.
Issued this morning at 9:00am, the warning is set to affect counties Galway, Mayo and Donegal.
Gusts of 70mph are expected, as Erik batters much of the country for a second day.
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The north is expected to bear the brunt of the high winds, with "severe" gusts expected this morning.
"We're looking at winds of 50 to 60mph in Northern Ireland and the west of Scotland".
As Storm Erik moves off to the east, another weather front will approach from the south.
It's still going to be wet and windy for a good part of saturday as the storm system is slow to clear away. Strong and gusty southwesterly winds will gradually abate.
With more travel disruption expected throughout rush hour acorss the nation, with the Met Office warning there will be a "trick commute".