Snow is set to hit Britain's biggest city centres within a fortnight as spring ushers in a steep temperature drop.
The Met Office says snow in Newcastle's hills is possible by tonight as temperatures are set to plummet across the UK on Monday.
The Met Office has issued yellow warnings for much of England's north and parts of Scotland for much of the day tomorrow, threatening more misery for morning commuters.
The number of flood warnings in force across England and Wales has increased as more heavy rain, gale-force winds and snow is forecast.
Newcastle, parts of Manchester, Leeds, York, Sheffield, Middlesbrough and Lancaster are included in the snow and flooding warnings.
The warning for England said the chilly weather is expected to take its grip from around 2am and could cause travel chaos throughout tomorrow.
The warning, which continues until 3pm Monday, could cause delays to morning commuters.
The Met Office warns some vehicles could be stranded on the roads, and more flooding, road closures and power cuts are possible.
The warning says some rural communities could be cut off, after weeks of flooding thanks to treacherous Storms Ciara and Dennis.
As temperatures take a dip, the UK is being warned to brace for windy conditions over the next fortnight, with lows of -8C expected in some parts on Monday according to some maps, reports the Express.
A fresh band of heavy rain moved into the south-west of England and Wales this morning - provoking a yellow weather warning for the already-drenched valleys of South Wales.
Met Office warnings for snow and ice remained in place today for Scotland, with the conditions expected affect higher routes and lead to perilous driving conditions.
The warning is for Central, Tayside and Fife, Highlands and Eilean Siar and Strathclyde.
A further Met Office warning for snow is in place from early Monday morning until the evening, for Central, Tayside and Fife, Grampian, SW Scotland, Lothian Borders, Highlands and Eilean Siar and Strathclyde.
The forecast says rain, sleet and snow will spread from the southwest in Northern Ireland overnight, and could settle in hilly areas, then should clear by tomorrow morning.
The Met Office's long-range forecast for the whole UK says unsettled and windy conditions will continue from Thursday, following weeks of floods in Wales and England's north and Midlands.
Rain is expected to move east across the UK, and will be heaviest in western and northwestern areas and especially the hills later this week.
There is a risk that deep low pressure systems could cause heavy rainfall and strong winds somewhere in the UK if the chill takes its grip.
The Met Office says Brits can expect to see temperatures shifting rapidly between mild and cold conditions.
During chillier periods, snow is forecast to hit hilly areas in England and Wales later in the week.
The wild weather is expected to settle in the southeast at the end of the first week of March, but remain unsettled elsewhere.
The number of flood warnings across 86 flood warnings increased to 86 this morning, spanning an area from Dorest to Carlisle.
The warnings come after communities around Derbyshire and Yorkshire were soaked at the beginning of the weekend, and South Wales saw towns including Pontypridd soaked earlier in the week.
Met Office meteorologist Simon Partridge said this afternoon that Monday is set to be the chilliest day this week.
Snow deposits of up to 5-10cm could form in hilly parts of England's north around 200 metres above sea-level, he added.
Snow would likely settle in the Pennines tomorrow, while lower-lying urban areas could see sleet, hail and rain, he said.
Scotland could see lows between -6C to -8C, Mr Partridge added.
"Once there's snow on the ground that's when you're likely to see those colder overnight temperatures."
The gloomy forecast came as Environment Secretary George Eustice defended Prime Minister Boris Johnson for defying calls to visit flood-stricken areas.
He told Sky's Sophy Ridge on Sunday: "It's not true that the Prime Minister's not been engaged in this."
Mr Eustice said: "In a cabinet Government it's not a one-man show, it's right that on certain operational things such as this that the Prime Minister will ask one of his Cabinet members to lead, I can't see anything wrong with that."
