In Scotland, 11 rural schools and nurseries are closed due to the snow.

One primary school in the Highlands (Achiltibuie Primary) and three nurseries (including the one attached to Achiltibuie Primary) are closed all day.

Kininmonth School is closed all day in Aberdeenshire.

Four rural schools are closed on Shetland: Aith Junior High School, Happyhansel Primary School, Whiteness Primary School andTingwall Primary School, and a fifth (North Roe Primary School) closed because its central heating isn’t working.

Other schools either opened an hour later than usual or are closing early, including Peterhead Academy in Aberdeenshire which is closing at 14:00, and there was some disruption to school transport in a few areas first thing.

A school is also closed in Orkney.

With yellow weather warnings in place across parts of the UK, here's a round up of where the alerts have been issued:

• Northern Scotland - warnings have been in place in Scotland from 16:00 yesterday and will remain until 10:00 tomorrow morning, snow and hail showers expected with up to 5cm of snow to accumulate
• Northern Ireland - wintry showers and icy surfaces expected, warnings in place from 18:00 later today until 10:00 tomorrow morning
• Central and Southern Wales - Warning for snow and ice in Wales have been in place from 11.42 this morning until 23:59 this evening, snowfall expected this afternoon, the warning doesn't cover Cardiff or Swansea
• East of England - snow showers expected to develop over Tuesday evening and continue overnight, warning in place from 18:00 until 12:00 tomorrow

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We've just seen updated figures on the number of school closures in Wales.

There are now 141 schools shut due to the snow, bringing the total number across Wales and England to 210.

As a reminder, you can look up which schools are closed in the two UK nations here, external.

Barra Best
BBC News NI weather presenter

Weather warnings for snow and ice have been issued for Northern Ireland from 18:00 on Tuesday until 10:00 on Wednesday.

Wintry showers are expected to develop on Tuesday evening and continue overnight into Wednesday morning.

Away from the north coast, lying snow is possible, with 1 to 2 cm in places and up to 5cm over higher ground.

However, it is important to note that the nature of showers mean that most places will avoid snow altogether.

Ice is also likely to form readily on untreated surfaces, leading to hazardous conditions

The warning follows snowfall, mainly over hills and mountains, in northern Ireland on Monday night.

Between 5 to 10 cm of snow was forecast to fall over the likes of the Sperrin and Mourne Mountains.

Meanwhile, Met Éireann has issued a similar warning for low temperatures and ice across the Republic of Ireland.

It runs from 20:00 on Tuesday until 10:00 on Wednesday.

The organisation is warning of hazardous conditions on roads and paths, particularly in untreated areas, with a risk of travel disruption.

Meanwhile, - one school is closed, with Holy Evangelists school in Dunmurry closed as the heating isn’t working.

Councils in England and Wales are "ready to work around the clock" to grit roads and pavements amid the snow, the Local Government Association (LGA) says.

“Councils have stockpiled millions of tonnes of salt to ensure those areas that are most treacherous are kept clear and safe for use," the LGA adds.

The association warns older people with respiratory conditions face higher health risks and urges residents to check in on vulnerable neighbours.

The Met Office has just issued a new yellow weather warning across southern Wales - but doesn't include Cardiff or Swansea.

It comes into effect from now until midnight tonight, with both roads and railways affected.

In Aberdeenshire, a Stagecoach bus ended up on its side in icy road conditions this morning in the New Leeds area.

Stagecoach North Scotland said in a statement that one passenger was on board at the time of the incident and no injuries were recorded.

"Safety is our absolute priority, and we will investigate the full circumstances involved," said the local bus service.

Scotland has recorded its coldest early winter temperatures since 1998, with snow and ice covering areas of the country overnight. Parts of Aberdeenshire reached a low of -11.2C.

Image source, EPA

Thousands of train passengers are experiencing disruption due to severe weather this morning.

Here's a breakdown of how different regions of the UK have been affected, as of 11am:

East Midlands Railway saw some 64 out of a total of 120 services (53%) cancelled or delayed by at least half an hour.

London North Eastern Railway saw37% of their services cancelled or delayed.

Transport for Wales and West Midlands Trains both saw 13% of their services impacted by the adverse weather.

CrossCountry saw 12% of their train services disrupted by the wintry weather.

As us humans grapple with delayed trains, closed roads and school closures - animals up and down the country are also braving the snowy conditions.

As a reminder, the cold temperatures can be a danger for pets, here's a look at how to keep them safe in the wintry weather.

Image source, Richard James Livesley-Cross

Image source, BBC Weather Watchers

Image source, BBC Weather Watchers

Helen Willetts
BBC Weather

Image source, BBC Weather

After the first snow of the season for many of us, warnings are now being issued to alert us to the ice risk through the coming evening and night.

Snow showers will also continue, giving several more centimetres across the northern half of Scotland with a scattering developing in Northern Ireland.

Wintry showers elsewhere combined with damp surfaces, after the rain and snow, will add to the ice risk. Conditions could become treacherous on untreated roads and underfoot, as a widespread frost is forecast overnight Tuesday.

Weather warnings come in three colours - yellow, amber and red - depending on the possible impact and likelihood of an incident.

A yellow warning could be some weather with the potential to cause major disruption, but is very unlikely, or weather which will probably arrive, but will only affect a small number of people.

If the risk of either factor increases, the warning will be upgraded to amber, or in very rare circumstances, red.

The Met Office has just issued another new weather warning, the third new yellow alert within the last hour.

This time it is for parts of east and north-east England, as well as the south-east of Scotland - set to come into place from 18:00 today until noon tomorrow.

The warning covers much of the east coast, from Eyemouth in the north to Halesworth in the south - including Newcastle Upon Tyne, Scarborough and Hull.

In the latest warning, the Met Office says up to 10cm of snow could fall over higher ground with icy patches on surfaces for those lower down.

The Met Office has just issued two new weather warnings for Wales and Northern Ireland, with multiple warnings now in affect across much of the UK.

One covers snow and ice across northern and central Wales, and comes into effect from midnight tonight until noon tomorrow.

Meanwhile, in Northern Ireland, a yellow warning for snow and ice is in place from 18:00 today until 10:00 tomorrow morning.

The Met Office adds there could be ice patches later, causing difficult driving conditions, with up to 5cm of snow expected in areas of higher ground.

Schools are only allowed to close in "exceptional circumstances", says the Department for Education - but it's the headteacher who ultimately makes the decision.

The head considers how safe the journey to school is, as well as the safety of the site itself. Staff often travel much further than pupils, and in all directions, so the area considered is larger than some parents might think.

Even if the snow seems safe in the morning, schools can close if conditions are forecast to get much worse.

The latest forecast from Carol Kirkwood says that it is going to be turning colder today, after parts of the UK experienced snow this morning.

More wet and wintry conditions are expected throughout the day.

Overnight, a hard frost is expected where temperatures in the Highlands could fall to -8C, if not lower.

Snow started to fall at about 07:00 GMT leaving snowy scenes in areas including Banbury, Chipping Norton and Littlemore.

For many BBC Weather Watchers out and about it was crunchy under foot as they captured the snow-covered landscapes.

Snow and ice has so far affected several areas across the UK, with the wintry mix due to continue to edge southwards.

Like humans, animals can be at risk of hypothermia. The veterinary charity PDSA advises putting extra blankets in dog beds and extra bedding for outdoor pets, like guinea pigs.

But for coats, the RSPCA recommends only older or ill dogs should wear them, and if your dog doesn't want to wear one, don't force it.

Animals will use more energy to stay warm, so consider giving them a little more food in cold weather. Extra playtime is also recommended for animals staying inside more.

And if they do go out, make sure to check their paws for snow - which can harden into painful balls of ice. Also make sure they have somewhere warm and dry to go at home.

Across the UK, BBC Weather Watchers have been sending in their photos of the snow, like these snaps from the far reaches of Aberdeen down to Leek Wootton in Warwickshire.

Image source, BBC Weather Watchers

Image source, BBC Weather Watchers

Image source, BBC Weather Watchers

Image source, BBC Weather Watchers