A status yellow wind warning will also be hitting Donegal, as well as other Western counties including Galway, Leitrim, Mayo, Sligo, Clare and Kerry.
According to Met Eireann there will be wintry showers right across the country with accumulations of snow over northern areas.
The weather forecasters say it will be generally dry to begin with winter sunshine, but scattered rain and hail showers will start to feed across the country in a northwest direction.
Northwest winds will increase strong and gusty.
There will also be ground frost with with icy patches and lows of minus 2 degrees, staying coldest over the eastern half of the country.
The weather forecaster said there will be further accumulations of snow locally over northern counties as well as on hills, mountains and higher ground elsewhere. Temperatures will fall considerably on Thursday evening.
There'll be highs of only 5 or 6 Celsius.
The UK Met Office have named it Storm Caroline.
The Road Safety Authority has cautioned motorists to expect the unexpected with high winds and icy conditions.