Temperatures will dip as low as -5C overnight across Co Armagh.
Some rural areas in Northern Ireland are expected to experience temperatures as low as -8C.
And that has forced the Met Office to issue a further yellow warning for ice between 6pm this evening (Wednesday) and 11am tomorrow morning.
There is a chance of snow on Thursday evening between 8pm and midnight but frost and ice is likely to develop on untreated surfaces.
Freezing fog will be an additional hazard in places. This will be worst between 5-9am tomorrow morning.
The public are advised to take extra care if travelling, particularly on untreated roads and footpaths, but also take care on roads which have been gritted.
The salting of roads on the scheduled network considered to be at risk is planned for this evening.
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