Snow has begun to fall in many parts of the UK as the country prepares for a week-long cold spell.
BBC Weather said southeast England will see snow, sleet and rain on Monday.
The Met Office warned of ice and snow across southern England and Wales afterward, which could cause travel disruption.
Flooding could also continue, mainly in central England, the Environment Agency said.
The Met Office has issued a yellow warning for ice in southern England and south Wales, from 15:00 GMT on Monday until 03:00 GMT on Tuesday. The agency warned that ice and small amounts of snow “could lead to slippery surfaces in new locations” and possible travel delays.
BBC weather forecaster Stav Danaos said north-east England will see light rain, light sleet and snow in the hills, while south-east England will see wintry showers and “snowfall”. mild”, even in lower areas.
The Met Office said a “mix of sleet and snow showers” would move in from the east, with temperatures reaching “near zero”.
“With these winter showers and also wet surfaces following recent wet weather, some icy patches could appear on untreated surfaces,” the forecaster added.
Temperatures are expected to plummet on Monday night. The Met Office said parts of England and Wales could reach -4C, while northern Scotland could see temperatures as low as -7C.
On Monday, the UK Health Security Agency (UKHSA) and the Met Office issued amber cold weather warnings for the south-west, south-east, West Midlands, East Midlands and north-west of England until 12:00 on Friday.
The Amber Alert means the impact of cold weather could be felt across the health service for an extended period.
Dr Agostinho Sousa, from UKHSA, emphasized the importance of testing people who may be vulnerable.
Especially for older adults, cold weather can increase the risk of heart attack, stroke, pneumonia and worsen arthritis. Accidents at home can also increase due to loss of strength and manual dexterity.
A yellow ice warning has also been issued for parts of Northern Ireland, along with a Met Office warning of possible difficult travel conditions due to icy patches on some roads and pavements. and untreated bike paths.
Police have urged road users to be cautious.
A Police Service of Northern Ireland spokesman said: “Stick to main, rough roads where possible. Please slow down and increase the braking distance from the vehicle in front.”
Nick Powell, from the AA, said anyone traveling in extreme weather conditions should check the condition of their tires – including the spare – and completely de-ice the car, including snow removal from windows, lights and roofs “so you can see and be seen”.
“It’s worth having winter essentials in your car like warm clothes, waterproofs, shovels, flashlights and water heaters,” he said, and phones should also be fully charged.
“Cold weather is also likely to affect the extent of vehicle damage, with defects such as dead batteries and frozen windshield wipers,” he said.
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Meanwhile, the Environment Agency (EA) said “significant river flooding impacts” were expected on Monday in parts of the Midlands, Lincolnshire and on the River Thames.
EA flood director Katharine Smith urged people not to drive through flood water and to follow the advice of local emergency services on the roads.
“Flood water is often deeper than it looks and just 30cm of flowing water is enough to float your car,” she said.
The warning comes after a week of heavy rain last week, some of which was part of Storm Henk.
The EA warned that more than 1,800 homes have been flooded and more could be affected over the next week as river levels rise.
Labor leader Sir Keir Starmer said the government’s response to the floods was not “good enough” and said his party would have set up a taskforce earlier in the year to tackle the problem.
“The response was not quick enough,” Mr Starmer told reporters during a visit to the East Midlands on Monday morning. So I don’t think it’s enough for the government to come after this event again and express sympathy.”
Chancellor Rishi Sunak visited flood-hit communities and EA workers in Oxford on Sunday, saying “touch wood we are through the worst of it”.
He said the government has invested record numbers in flood prevention, helping to protect homes.