Met Éireann has upgraded its weather warning to Laois and all of Leinster.
Met Eireann forecasters say last night's rain has moved on towards the United Kingdom but snow accumulations of up to 3cm are set for the north and northwest of the country.
Accumulations of up to three centimetres are possible in parts while icy conditions are likely on the roads.
The warning is valid from Thursday, December 7 4pm to 6pm Friday, December 8.
Now, Met Éireann have included 18 other counties in a yellow weather warning for snow and ice over the next 24 hours.
"There will be a cold spell for the next ten days". Winds will be very light.
Arctic air started to sweep the country this morning in the wake of Storm Caroline, which brought "hazardous winds" to Scotland and Northern Ireland overnight. "Icy stretches too. North and North West counties will be most at risk, as well as higher ground elsewhere".
Snow settled in Yorkshire last week - and more is coming! It'll stay cold, but bright.
Coastal areas should be milder with temperatures closer to 5 or 6 degrees. Scattered wintry showers also - mainly near coasts. A widespread sharp ground frost will form during clear spells with icy patches forming widely.
Next week will continue to be cold, but with a lot of dry weather.