Met Eireann has issued a Status Orange warning for the whole country as Storm Brendan hits tomorrow.
Weather chiefs had issued three weather warnings, including two Status Orange alerts for 11 counties, as the west and northwest braces for the onslaught.
The national forecaster revealed the west coast is set to be lashed by high winds gusting up to 130km/h on Monday.
But they have now upgraded the alert to an orange caution nationwide.
The weather is expected to get extremely bad tomorrow, with heavy rain, thunder, flooding and wintry showers all expected.
A spokesman said: "Monday will be extremely windy or stormy, as storm Brendan tracks to the northwest of the country.
"Strong to gale force southerly winds will extend countrywide during the morning, with severe and damaging gusts, especially on southern, western and northwestern coasts.
"Heavy rain will extend from the Atlantic also, possibly thundery in places. There is a significant risk of coastal flooding due to a combination of strong winds, high spring tides and storm surge.
"Clearer conditions, with squally showers of rain and hail, will follow from the west during the afternoon and early evening, but there is a continuing risk of thunder. Winds will veer southwesterly with the clearance, easing a little in most areas, but it will remain stormy on western coasts, with further severe gusts.
"Maximum temperatures 7 to 10 degrees."
And more warnings look like they will be on the way, with Met Eireann also having a weather advisory in place.
It reads: "We are entering a period of very unsettled weather. Further warnings for strong winds and rainfall are likely to be issued in the coming days."
