A big temperature drop is coming to the UK this week, bringing icy conditions and possible disruption.
Weather mapping from independent forecaster WX Charts shows subzero conditions coming to the north west of England and north Wales on Saturday.
It comes after a slightly milder spell this week which saw the mercury rise again after some surprise snowfall at the start of January.
The Met Office has also issued a yellow warning for 'dense fog' on Wednesday morning (12 January) across southern England and the Midlands, with visibility expected to be less than 100 metres in some places.
They advised that this could result in travel problems on roads around peak times, and may even lead to delays or cancellations at airports and railway stations.
Fog is then expected to clear from most locations by the end of the day.
The outlook from the national forecaster for Thursday to Saturday reads: "Settled but colder in the south with fog and low cloud becoming more widespread and stubborn to clear.
"Milder further north with cloud, rain and stronger winds at first."
Nick Finnis from Netweather gave an explanation for the upcoming cold and foggy spell, writing: "The reason why the air will be colder at the surface than higher up is because of radiative cooling at night under clear skies and calm conditions leading to frost forming and also freezing fog.
"With little wind and weak sun this time of year, freezing fog may be slow to clear during the day, meaning temperatures struggling to get above freezing where fog lingers."
A breeze coming west into Scotland from the Atlantic from Friday onward will result in a reversal of the usual climate split across the British Isles, with temperatures likely to be warmer north of the border than they are in the south of England.
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