There is also a good chance that power cuts may occur with mobile phone coverage possibly affected.
Storm Eleanor, the fifth winter storm of the season, is expected to make landfall this evening.
She added: "The strong winds coincide with high tides in some western areas which could lead to large waves which could have some impact as well".
The forecaster says: "Southwest to west winds of mean speeds 55 to 65 kmph, gusting 90 to 110 kmph, will develop later this afternoon and evening and will continue overnight and through Wednesday".
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.
High tide in Blackpool will be at around 11.30am.
She said the agency's frontline teams will be out checking defences and may close coastal flood gates.
Police in North Yorkshire have warned drivers to be extra careful tonight and tomorrow. Strong winds and gales in the west, then transferring eastwards through the small hours.
You'll be scrambling for your anoraks come Wednesday with torrential downpours likely to follow the windy start to the first week of 2018.