People in Wales and the far West of England could wake up on Monday morning to a widespread dusting of snow.
Snow showers have affected higher areas in the west of the country as well as The Pennines and the North York Moors today.
But the wintry weather is expected to spead to lower areas of Wales and the southwest peninsula by tomorrow morning.
The Met Office has issued an amber warning of snow for parts of Wales, saying the hilly parts of the south and southeast of the country could get as much as 10cm.
Higher areas of southwest England, especially Exmoor, could see 5cm of snow but lower areas are more likely to see a 1-2 cm "slushy covering", it added.
Sky News weather presenter Jo Wheeler said: "As the wet weather runs into the colder air snow is likely for parts of Wales and the southwest, where there could be some significant snowfall lasting through until Monday morning."
She added there may be some wintry showers drifting in from the North Sea to affect eastern coasts, but elsewhere it would be "another cold night" on Sunday.
Rachel Vince, forecaster with Meteogroup, the Press Association's weather division, said: "It (snow) should affect lower areas by Monday, especially in Wales, including some of the bigger population centres.
"The question is how far east this will go. Many people starting the working week probably will have some snow."
But she said it was unlikely any snowfall at lower levels would be substantial.
The likely limit of the snow showers is a line between Liverpool and the Isle of Wight but forecasters say the exact extent is difficult to predict.
The Met Office has also issued a warning of severe cold weather across much of England until at least Thursday.
The next few days look like being the longest spell of cold weather so far this winter.
Forecasters say temperatures will drop as the week progresses with widespread frosts at night and low temperatures during the day but only the occasional wintry shower.
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