With winter gaining momentum, snow levels in parts of Britain could hit 6in (15cm) this week, forecasters have said.
Heavy snow and overnight temperatures as low as minus 9C (15.8F) can be expected in north-east Scotland, and snow and sleet are set to affect eastern England.
Gemma Plumb, a forecaster from MeteoGroup, the weather division of the Press Association, said: "It's going to turn increasingly cold next week and then, from Wednesday, showers are going to turn to sleet and snow, especially in northern Scotland and eastern parts of England."
She said Scotland should be braced for heavy snow, while "significant snow accumulations" are likely in Yorkshire, Lincolnshire and East Anglia, with no indication as to how deep the snow could be on the ground.
Ms Plumb expected temperatures across the East of England to reach minus 6C (21.2F) from the middle of the week.
Snow and sleet are likely to appear in the west of Wales as well, she added, due to cold winds off the Atlantic.
However, the harsh weather is not likely to disturb London this week, she said.
Ms Plumb said: "It will be very cold in London and I couldn't rule out a few sleet or snow showers but we're not expecting any significant accumulations of snow there."
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