Weather experts have ramped up warnings of an Arctic blast bringing extreme wintry conditions to Britain by Friday the 13th.
Thermometers are expected to sink to below -10C across large swathes of the country in conditions colder than Iceland.
Four inches of snow is also forecast to bury the UK by the end of the week in the first real lashing of the season.
Now shiver-inducing maps reveal where the worst of the snow storms will hit the UK.
According to the charts from Weather Outlook, the worst of the white stuff will strike in Wales, northern Scotland and the north west of England.
It appears the south east of England will also be struck with snow to a lesser extent.
Face numbing winds sweeping in from the North Pole will send temperatures nose diving over the next few days.
Wintry showers will then blanket the country from Thursday, with more frequent snow storms forecast for Friday.
Brutal gale force winds and stormy conditons will collide with bitter air from the north triggering bouts of thundersnow.
Thundersnow is a rare type of thunderstrom which sees snow fall instead of rain.
“By Thursday and/or Friday, I think most places will stand risk of seeing something a bit wintry – sleet or snow.”
Met Office forecaster Steven Keates
Met Office forecaster Steven Keates said: “It is going to turn much chillier, particularly through Thursday and Friday. Some areas could see snow, and some pretty significant snow.
“Most places are at risk. By Thursday and/or Friday, I think most places will stand risk of seeing something a bit wintry – sleet or snow.”
Weather boffin Marco Petagna said Friday could be the coldest day of the year.
He said: “A cold front moving in from the Atlantic will bring heavy frost and frequent snowstorms.
“It is likely that five to ten centimetres of snow will come in from the north and fall as far as the south of the country on Friday, and there could be even thicker snow in the hills.”
Warning of “nightmare” conditions on the roads, he added: “People will need to keep tuned to forecast updates because it is extremely likely that travel warnings will be issued.
“The frost is likely to harden which could give rise to a number of hazards.”
James Madden, forecaster for Exacta Weather, said the heaviest snowfall will hit Scotland and the north of England.
He said: “Despite some quite mild temperatures for the time of the year during the middle part of the week, a rapid change in weather from Thursday will see cold air encasing the country.
“These conditions will be accompanied by widespread snow showers across most and if not all parts of the country.”
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