Up to 8 centimeters is expected to fall, with the weather warning staying in place until 11pm on Sunday.
Met Eireann have issued a new status orange snow-ice warning for seven counties.
A Status Yellow snow and ice warning is in place for counties Dublin, Louth, Wexford, Cavan, Monaghan, Leitrim, Sligo and Waterford.
An orange weather warning has already been issued by Gardai and Met Eireann for counties in Connacht, Ulster and Leinster.
A status yellow alert comes into effect this afternoon, with the northern half the country worst hit with up to 3 centimetres of snow expected in places.More news: Eagles Soar Over Rams, 43-35, in Epic NFC Showdown at Coliseum
- Met Éireann (@MetEireann) December 10, 2017Met Éireann high resolution model HARMONIE showing mixture of rain and snow prediction for 9am Sunday.
Particularly heavy snow was reported in Ballinasloe - and snow ploughs have been deployed to clear sections of the motorway affected by heavy falls. Clearer weather over Ulst with frost will grad extend S in aft. "Minimum air temperatures -2 to -8C".
Tomorrow will be a cold, bright day and it will be mainly dry.
"Some hail, sleet or snow showers will affect parts of the west and north".