The Met Office have issued a warning for Scotland of heavy snow from Monday at 6pm until 11.55pm on Tuesday.
Poor visibility will spark tailbacks on roads and motorways while railway and air passengers have been warned to expect delays.
"Mist and fog patches will be forming as the night progresses and these will be freezing and dense in central and northern areas".
Up to 2in of snow could fall at lower levels, with up to 4in predicted in areas above 656ft.
While Limerick city and county is now enduring dense fog at present, Met Eireann expects this to worsen between Thursday evening and the early hours of Friday morning.
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He said: 'We are currently in the calm before the storm, there are now strong signals for a potent wintry blast to arrive early next week.
'The snow will initially hit many northern and western areas and persist over several days, before impacting many other parts of the country at times during next week.
A Met Office severe weather warning covers a portion of western Britain through tonight until 11am tomorrow.
Motorists were warned to take care in the conditions with the AA advising drivers to use their fog lights.
The national meteorological service say there will be very poor visibility, with fog lingering in many midland area, which will become more extensive and dense this evening and for a time tonight.