warnings currently apply until am on Thursday,
The Met Office said snow would continue across the North until mid to late morning, with an increased risk of falls and of icy patches on untreated roads and pathways.
There will also be high winds, with showers likely stay throughout the day.
Light snow is also likely on higher ground in Northern Ireland.
The lowest temperatures are expected to hit on Friday night, with the mercury dropping to -5C in Scotland and dipping below zero across the north of England.
Further south, showers will also move in from Wales throughout Thursday morning, passing over London and the East of England over the course of the afternoon.
Temperatures in the South will rise going into the weekend, with highs of eight on Thursday, ten on Friday, and 24 on Saturday, before falling again on Monday.
Temperatures will also rise in the North, but reaching highs on Saturday of only six and seven.
Nights this week will likely see temperatures dip below freezing, with the Met Office saying that Norwich, Manchester, and Newcastle will be among the worst-hit areas.
Met Office Meteorologist, Emma Salter, told the Sun Online: “There’s definitely going to be quite a different feel in the weather over the next couple of days.
“Anywhere that’s m above sea level is likely to see about 2cm of snow on Wednesday night in to Thursday.
“As we go through the week the winds will change and we’ll get that cold feel.
“Every night this week we could get a couple [of places] dipping below freezing.”
The cold blast will see widespread frost and some snow in parts of the UK on Wednesday night.
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A car trapped in the snow in Upper Teesdale, County Durham, earlier this month Credit: Alamy Live News
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The varying temperatures also come with warnings of heavy rain issued by the Met Office.
Up to mm of rainfall was expected to hit Wales from last night until 12 am today, with a risk of power cuts and travel disruption.
The average rainfall for March is mm in Wales which means the worst affected areas could be hit by three weeks of rain in just over hours.
The Met Office warned there is a good chance some communities will be cut off by flooded roads and fast flowing or deep floodwater could cause a danger to life.
The Environment Agency has issued flood warnings and alerts across the country.
Areas already hit by flooding in February, including Builth Wells and Newtown in mid Wales, are among those expected to be worst hit, with flooding likely to cause damage to homes and businesses.