A weather warning is in place in Northern Ireland as freezing temperatures cause chaos across the UK.
The yellow alert for snow and ice is in effect until 6pm today.
Between 5-10 cm of snow is possible over the Mournes, Sperrins and Antrim Hills, with lighter dustings elsewhere, the Met Office said.
Across the UK, heavy overnight snow has caused disruption as the cold start to the new year continues.
The Met Office said Bingley, West Yorkshire, had seen 12cm of snow up to 7am on Sunday, with Shap in Cumbria and Capel Curig, Gwynedd, both seeing 10cm.
Manchester and Liverpool John Lennon Airport both closed their runways on Sunday morning due to heavy snow. Manchester said its teams are working to clear them “as quickly as possible” but had been hampered by “heavy snow” around 7am.
Some flights from Belfast have been affected, including to and from Leeds-Bradford Airport, which shut its runway.
Liverpool City Council’s safety advisory group is meeting this morning to decide whether today’s Premier League match between Liverpool and Manchester United can go ahead.
The match is scheduled to kick off at 4.30pm at Anfield. However, the city’s airport has shut its runways amid heavy snow, and is covered by an amber weather warning for snow and ice that will remain in place until at least midday.
In the Irish Republic, 28,000 premises without power after overnight snowfall. Eleven counties have a ‘Status Orange’ warning.
The latest weather warning covers all six Northern Ireland counties.
The Met Office said: “Spells of rain, sleet and snow will develop from the south late on Saturday before clearing through Sunday.
“Coastal areas will likely see rain, but inland and over higher ground, sleet and snow is more likely.
“Locally 1-3 cm of snow is possible away from coasts, with 5-10 cm possible over the Mournes, Sperrins and Antrim Hills.
“Ice will be an additional hazard, especially on untreated surfaces.”
Larger snowfall is expected at higher grounds
The Met Office said there is likely to be disruption to transport and some infrastructure.
It added that some roads and railways are likely to be affected with longer journey times by road, bus and train services.
There is also a warning of some icy patches on untreated roads, pavements and cycle paths, and the risk of injuries from slips and falls on icy surfaces.
It comes as many workers return and schools reopen tomorrow after the Christmas break,
Temperatures plummet to minus 5C overnight as cold snap continues to grip UK
The Met Office has cautioned commuters of a “fairly considerable ice risk” in place, with a particular focus on rural areas.
They advised those travelling to give themselves extra time due to the more hazardous conditions.
Throughout Monday, icy surfaces are expected to subside as sunny spells break out later in the morning.
Temperatures will remain in the low single figures, reaching highs of around 3C.
Altnaheglish reservoir
A spokesperson from the Met Office added: “With the sleet or snow falling through Sunday, it does mean surfaces will be quite wet going into Sunday night and Monday and temperatures are expected to drop then. A drop of perhaps -2C and -3C is expected in rural parts so there could be a fairly considerable ice risk.
“It could be a little more dangerous, so I would advise to give people a bit of extra time given the wintery nature of the weather that’s around at the moment.
“Monday itself will see some spells of sunshine, so hopefully it will thaw away into the morning although around travelling to work and school times it could still be below freezing so do take care when travelling then.”
In the Irish Republic, around 28,000 premises are without power as a result of adverse weather conditions, according to ESB Networks.
The figure, which is accurate as of 8.30am, mainly consists of homes, farms and businesses in counties Limerick, Tipperary, Kilkenny, Carlow, Laois and Wicklow.
There was significant snowfall overnight, particularly in Munster and southern Leinster.
Met Éireann has forecast temperatures will struggle to get above freezing before Thursday.