The Met Office says Storm Eleanor will batter the coastline between 6pm and 8am tomorrow.
Video from Galway show the city's docks flooded, streets under water and even people driving along the seafront as huge waves endanger their vehicle.
This evening and overnight Storm "Eleanor" will bring a short period of disruptive winds to Cumbria and Lancashire which coincides with a period of high spring tides.
"There is a small chance of injuries and danger to life, as well as minor property damage, from flying debris", it said. The Met Office has issued several national severe weather warnings due to the potential for travel disruption.
The yellow warning for wind has been in place since 6pm and will last for 24 hours, covering the majority of England, Wales, and the southern parts of Scotland.
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"Gusts of 50 to 60mph are likely quite widely within the warning area, whilst gusts of 70 to 80mph may affect exposed coastal areas in the west and south".
There ia risk of coastal flooding also with very high seas along Atlantic coasts.
Rain will be persistent for a time early in the night with heavy, squally showers and a few clear spells following later.
A wind warning is in place for Dublin, Galway, Clare, Carlow, Kildare, Laois, Longford, Louth, Wicklow, Offaly, Westmeath, Meath, Limerick and Tipperary.