Liverpool is bracing itself for an ice-cold snap, with temperatures predicted to sink as low as -1C.
The Met Office has issued a yellow weather warning for Merseyside. They warned that frequent wintry showers will spread through the early hours of Thursday as Arctic air moves in.
These will fall on frozen ground in many areas, leading to the formation of icy stretches on untreated surfaces. In addition, showers are likely to fall as snow on high ground, with slight accumulations possible in places.
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The UK Health and Security Agency has issued a cold weather alert recommending people warm their homes to at least 18C. The Met Office said on Twitter: "If you haven't already, it's time to dig out the winter hats, gloves and scarves."
Forecaster Oli Claydon said: "Day to day we are in cold conditions already with that north-easterly flow, but conditions are set to get colder through the week, with the worst showers across northern Scotland but also bringing much colder conditions across all the UK.
"Overnight lows of minus 10 to minus 11 in areas where we do get snow in those rural parts of Scotland, with temperatures down to minus six in rural England. Cold conditions to remain through the weekend. Signs of warmer weather moving in from the southwest from Tuesday next week.
"But the signs are that the cold weather will hold in the north of the UK, so there will be a split between north and south." People should expect snow showers and ice to cause travel disruption and a risk of slippery surfaces.
Warnings will remain in place until Thursday afternoon, but the cold weather will not begin to shift until early next week. Age UK has advised maintaining a supply of food and medicine to reduce the number of outdoor trips and torches with spare batteries in case of a power cut.
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