An icy arctic blast is set to batter Britain with snow and gale force winds as temperatures could plummet to -10C in some parts of the UK.
The Met Office has issued an alert for snow for all of Scotland and most of Northern Ireland on Monday and Tuesday.
Up to four inches could fall over those two days, with forecasters warning of blizzards and frequent lightning strikes, which could cause power cuts and mass travel disruption.
Thick fog will also cause travel chaos across the UK as commuters will face difficult driving conditions and flight delays today.
One forecaster warned that a ‘potent wintry blast’ is on its way and could arrive in the UK ‘early next week’.
Remote parts of Britain will be hit by freezing winds as temperatures could drop as low as -10C in Scotland and snow could even fall on higher grounds.
A woman was spotted pushing a pram on bitterly cold and frosty morning in Aberystwyth, Wales, on Thursday. The Met Office has issued a yellow warning for fog, with very low visibility, for much of Wales
Fog was seen covering parts of the Brecon Beacons in South Wales as the Met Office issued a yellow warning for large parts of the UK
The famous Harland and Wolff cranes peer through the fog as a walker makes his way across Cave Hill on Thursday in Belfast, Northern Ireland
People were seen walking in a park in Aberystwyth, Wales, with temperatures below freezing after a night of clear cloudless skies
The Met Office has issued an urgent yellow warning and said some flights could be delayed because of patchy fog on Friday night.
Almost the whole of Northern Ireland, and the west of England, including Liverpool, Manchester, Wolverhampton, Bristol and parts of Devon will also be affected by thick fog.
James Madden, a forecaster for Exacta Weather, warned that snow will hit ‘northern and western areas’ next week.
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.
‘Westerly winds will clash with colder air to deliver widespread and heavy snow showers across some large swathes of the country.
‘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.
‘We have to go back a few years to the last time we experienced anything of this potency, this is looking like becoming a notable and lengthy spell of widespread cold and snowy weather.’
Meanwhile, motorists have been advised to allocate more time for their journeys this morning.
Mark Wilson, a forecaster at the Met Office, told MailOnline: ‘We have issued a fog warning with parts of Northern Ireland, Wales, the west of England and Devon affected.
‘We have already seen fog around and it will continue over the next couple of hours and into today.
‘Motorists should take care out on the roads as they will be driving in tricky conditions when heading to work.’
A spokesman for the Met Office added: ‘Patchy fog is expected to reform in places this evening and overnight. Slower journey times are possible and there is a chance of delays to flights.’
Dog walkers were seen enjoying a sunny but cold day on Weymouth beach, in Dorset, on Thursday morning as parts of the UK will be hit by thick cloudy fog today
A young woman walked her two dogs through the park in Aberystwyth and fog is set to continue to cover parts of south east Wales on Friday morning
The Met Office has issued an urgent yellow warning and said some flights could be delayed because of the patchy fog in Northern Ireland and west England and south east Wales
Dozens of people enjoyed a stroll along Weymouth beach on Thursday morning as the Met Office issued a yellow weather warning