The warning has been issued as Storm Caroline makes its way toward Irish shores.
Met Éireann has issued an updated weather warning for Ireland of high winds, low temperatures and a chance of ice and snow.. Northwest winds of 55-65km/h are expected to gust 110-110km/h, with the strongest winds in coastal areas and over high ground.
"Thursday will be a cold, bright and windy day".
Scattered snow showers will occur later Thursday, Thursday night and into Friday, while slight to moderate accumulations are possible with up to 3cm in parts.
"Some of the showers will be heavy, with a risk of thunder".
Snow is forecast but it will not be as bad in coastal areas as it will be in inland areas.
"Minimum temperatures will be between -2C and 2C, with frost and icy stretches, especially in places sheltered from the fresh north-westerly wind".