Met Eireann has this afternoon issued another Status Orange weather alert, warning that the fog may become more extensive and dense later this evening.
Visibility could drop to 100 metres in some places bringing risky driving conditions and hindering flight take offs, he added.
The warning was originally valid to 10am Thursday, January 11 but Met Éireann has since updated this and kept the warning in place until noon.
Despite a switch to a more westerly airflow it will feel cold especially across the north where the odd flake of snow is possible, according to Exacta Weather's James Madden. "There are possibilities of power cuts and drops in mobile phone coverage".
In a post on their website, the forecaster is warning of "frequent and heavy hail and snow showers are likely to affect many parts of Scotland and Northern Ireland from Monday evening, continuing for much of the day on Tuesday".
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'Motorists should take care out on the roads as they will be driving in tricky conditions when heading to work'.
"The largest accumulations of snow will be on high ground with over 10 cms of snow building up above 200 metres".
"At low levels, accumulations of the order 2-5 cm (0.8in - 2in) will be more typical".
It adds: "Strong winds create the potential of blizzard conditions and drifting of lying snow".