Ice and wintry showers are on their way as London is about to be plunged into another cold spell, forecasters have warned.
Ahead of the cold spell, heavy showers and strong winds are predicted to grip London on Saturday, with highs of 12C and lows of 5C.
On Sunday, there will be a mix of patchy cloud and spells of winter sunshine throughout the day. The odd shower will likely develop at times, the Met Office says.
Overnight temperatures in the capital are expected to drop to -2C on Monday, with forecasters warning of further rainfall going forward.
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The Met Office says chilly weather is due to arrive after the rain and by later on Sunday, most of the UK will be in the northerly airflow, with lower temperatures spreading further south overnight”.
Grahame Madge, a Met Office spokesman, said on Friday: “We have got a transition coming and cooler conditions as well as heavy rain working its way from west to east into England and Wales. It will turn colder with a northerly airflow bringing wintery hazards.
“Monday into Tuesday, we could see temperatures drop down further.
“There is a chance of showers but for London, ice and frost will be the main wintery hazard.”
Meanwhile, the weather in Wales and areas of England including the North East, the North West, the South West, Yorkshire and West Midlands will result in potential flooding.
Forecasters say showers will turn into “sleet and snow in the North, even to lower levels”.
And on Monday, a spell of rain could see snow “over high ground such as the Brecon Beacons, Exmoor and Dartmoor”.
A total of 20mm to 30mm of rain is likely quite widely, with 40mm to 50mm expected on some hills.
The Met Office said areas such as the Brecon Beacons will see some of the highest totals for Wales with up to 70mm.
Across south-west England, places such as Exmoor and Dartmoor could see 50mm to 60mm.
Strong winds are also expected, with gusts of 40-50mph and possibly 60mph on some exposed coasts in the south.
As of Friday evening, there were 80 flood warnings in place and 155 flood alerts.
Forecasters say showers will turn into “sleet and snow in the North, even to lower levels”. And on Monday, a spell of rain could see snow “over high ground such as the Brecon Beacons, Exmoor and Dartmoor”.
As the weekend comes to an end, a cold weather alert will be in place with a 70 per cent probability of severe cold weather, icy conditions or heavy snow between 6pm on Sunday and 9am on Thursday in parts of England.
“This weather could increase the health risks to vulnerable patients and disrupt the delivery of services,” the Met Office said.
“Please refer to the national Cold Weather Plan and your trust’s emergency plan for appropriate preventive action.”
Forecasters said northerly winds will develop through Sunday and into Monday, bringing colder air across much of the country.
“This will affect northern areas initially on Sunday, before moving south to affect most areas during Monday.
“Showers will be more frequent in western areas and fewer in eastern areas, but becoming increasingly wintry for all areas through Monday.
“Occasionally strong winds will exacerbate the cold feel. These alerts may be updated on Monday once confidence has improved in the timing of the cold weather and areas to be included.”
The Met Office triggers a yellow cold weather alert as soon as the risk is 60 per cent or above for any of the thresholds to be breached.