Travel delays on roads and rail are also likely, and rural communities face being cut off.
He said snow showers in other parts of the country are expected to ease throughout the day, with some spells of sunshine possible.
Amber warnings have been issued for tomorrow for the East Midlands, North West England, West Midlands, Yorkshire and Humber, the East of England, London and South East England.
After yesterday's high of almost 16C, much of Britain this weekend will have near-freezing temperatures, the Met Office has said.
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Wednesday , Thursday and Friday look to be cooler and drier as high pressure builds into the region behind the front. Sunday is looking dry throughout the day but Sunday night is when we see rain chances return to the forecast.
Temperatures are set to plummet with snow and ice expected in parts of the country this weekend.
Snow fell across large parts of the United Kingdom last night (Friday) as freeing winds from the east drove icy-cold winds drove the mercury down towards zero.
"This warning has been updated to remove much of Scotland (apart from the southeast) and parts of Northern Ireland, whilst it has been extended to cover remaining parts of eastern England and the extreme southwest", a statement on the Met website read.
Temperatures will fall sharply to feel as low as -8C (18F) overnight and around freezing during the daytime as the cold snap sweeps in from Siberia to bring up to eight inches to England and Scotland.
Sunday will be a similar story, with snow and ice expected across the UK.
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A British policeman was also poisoned when he went to help them and remains in a serious but stable condition. There's no evidence at this stage that his death and the attack on the Skripals are linked, it said.
Yellow warnings for snow and ice are in place throughout the day on Sunday covering the same areas and stretching to South West England and Wales, with 20cm of snow likely on higher ground.
"We don't expect anything like the same impact as a result of it, although there will be some snow about".
"It will be a very cold day nearly everywhere, so the advice for all parade-goers and marchers is to wrap up well", a Met Éireann spokesperson said.
The forecaster is warning of "heavy snow showers" with accumulations and drifting in the places.
Temperatures are expected to return to normal for this time of year by Tuesday, but Saturday and Sunday are expected to bring temperatures of freezing, with travel disruption expected.
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