And now Met Eireann are predicting icy conditions with up to 3cm of snow in some areas on Thursday and Friday.
Forecasters warn of snow showers over the evening, as well as on Friday.
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And as Storm Caroline looks set to blow in, gusts of up to 110kph are forecast for Donegal, Galway, Mayo and Kerry today as weather chiefs issued a Status Yellow warning until 11pm tonight.
The warning will be in place between 4pm on December 7 until 6pm the following evening. "Northwest winds will be strong and gusty". It'll stay cold, but bright.
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Meanwhile, Donegal, Galway, Leitrim, Mayo, Sligo, Clare and Kerry will see a wind warning come into effect at 3am tomorrow ahead of Storm Caroline. A widespread sharp ground frost will form during clear spells with icy patches forming widely. It will turn increasingly wintry with biting north-west winds.
A weather front from the north is to hit the country in the next few days with Friday set to be one of the coldest days of the winter to date. High-sided vehicles and motorcyclists are particularly vulnerable to strong winds. "Lowest temperatures -2 to +3 degrees, coldest inland in the north".
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Road conditions will be in a poor state across the country and motorists are advised to be vigilant for ice and to slow down.