Liverpool John Lennon Airport says its runway has now reopened.

Here's the full statement released just now:

The runway has now reopened following the earlier safety and operational issues caused by the snow and icy conditions experienced throughout today. Flights are however subject to delay or cancellation. If you are traveling today please check with your airline for the latest information.

The Met Office currently has three weather warnings in place across the UK:

Northern Scotland - Yellow snow and ice

• Covers northern Scotland and the Scottish isles until 23:59 GMT on Monday
• Warns that frequent and heavy snow showers could cause travel disruption and delays

Wales and England west coast - Yellow snow and ice

• A yellow snow and ice warning is in place from 12:00 on Monday until 11:00 on Tuesday
• "Scattered sleet and snow showers, and icy patches, may cause some travel disruption on Monday and overnight into Tuesday morning," the Met Office says

England east coast and south east Scotland - yellow snow and ice

• A yellow snow and ice warning will remain in place until 11:00 on Tuesday
• This warning covers most of England's east coast, as well as small parts of south eastern Scotland

A further warning is coming in later this afternoon:

Northern Ireland - Yellow ice

• A yellow warning is in place for ice from 17:00 on Monday until 10:00 on Tuesday
• It covers most of Northern Ireland, except for small parts of the west and north west
• "Ice formation on untreated surfaces is likely to cause impacts in places on Monday evening, and overnight into Tuesday morning," the Met Office warns

We've been hearing from frustrated travellers at Liverpool John Lennon Airport, where the runway remains closed. One passenger tells the BBC "it's absolute chaos in there".

He says he's supposed to be heading to Geneva for his granddaughter's first ski trip, and adds: "I know the weather has been an inconvenience but it's been well-advertised that it was going to be a snowy day... I can't understand why they can't do better."

Victoria, from Chester, was hoping to fly to Gdansk in Poland, but she says they've received "minimal information" and will now have to wait until Wednesday to fly.

"We were funnelled all the way through Border Control, back again, and out, and back through arrivals," she explains.

"It would have been quite handy to have known after about six hours of waiting."

Another passenger from Chester says he had plans to fly to Paris but his flight has now been changed to 18:00 GMT tomorrow - despite his brother leaving from nearby Manchester this morning.

"I just think that Liverpool are lacking with clearing the runway. I think they could do a lot more," he says.

On its site, Liverpool John Lennon Airport says its teams are "continuing to clear the snow and ice" and advises passengers to check with their airline.

It says a further update will be provided at 15:00 - we'll bring you any news as we get it.

Image source, BBC Weather Watchers/Weather Watching Wendy

Schools in Orkney and Shetland will also be closed on Tuesday.

Shetland Islands Council said lying snow was still affecting travel in several areas after heavy snowfall forced the closure of schools on Monday.

Orkney Islands Council also announced the closure of all schools and nurseries on Tuesday due to the conditions.

The University of Highlands and Islands campus in Kirkwall will remain closed until further notice.

In a further update from Scotland, Aberdeenshire Council has announced that schools and council-run nurseries in the area will remain closed on Tuesday.

The local authority says it had made the decision “based on a range of factors impacting on our schools’ ability to open safely”.

They say a decision to open schools on Wednesday, after the current yellow weather warning ends, would be taken tomorrow.

Stagecoach has suspended all bus services in Aberdeen and Aberdeenshire until further notice.

In a statement, posted on social media, they say the decision had been taken “in the interest of driver and passenger safety”.

The bus firm will review the conditions as they progress throughout the day.

Louise Hosie
BBC Scotland reporter

Tractor driver Duncan Wright is clearing the snowdrifts around Drumoak School in Aberdeenshire, about 13 miles (21km) west of Aberdeen.

The school is among hundreds closed to pupils today because of the weather.

Duncan says he was forced to “crawl out of his tractor” yesterday after becoming stuck in a snowdrift.

He says the conditions are the worst he has seen in 44 years of clearing the local routes of snow.

In Inverurie, some residents criticised the response to the snowfall by Aberdeenshire Council.

Eleanor Cardno, 73, says she had “never seen snow like it” but wants the council to do more.

“It's just relentless.... There's very little grit going down. I know that they [the council] are struggling with money but there's nothing," she tells the BBC. "The big tractors come by, they blow it all out onto the pavement."

Ewan Milne, 60, says the local authority “couldn’t keep up” with the conditions, adding: “Years ago there was never this problem.

"The guys were out with their little pedestrian snow ploughs and everything was done pretty well, but it seems to be lacking nowadays."

However, Finlay McPherson says she appreciates the council's response: “They've done well keeping the main roads as clear as they can. The constant drift means it's a constant job and they seem to have been on that which is all you can ask."

Darren Bett
BBC weather presenter

The Met Office have just issued a yellow warning of ice for Northern Ireland valid from 17:00 today to 10:00 tomorrow.

This is in addition to the snow and ice warnings already in place for Scotland, parts of northern England, Wales and south west England that run through tomorrow morning.

If you need to leave the house today, here's a reminder of some best pracitices for driving in snow and ice:

• Clear all snow and ice from your windscreen, as well as the roof of the car, before setting off
• Don't use boiling water to de-ice your windscreen, though. This can crack the glass and the water on the screen will only freeze again
• If you drive a manual car, use second gear to pull away and lift the clutch gently. Stay in a higher gear for better control
• Brake, steer and accelerate as smoothly as possible, and drive so that you do not rely on your brakes to be able to stop
• As the chart below shows, stopping distance can increase greatly in snow and ice, so leave more space behind the car in front than you usually would

Image source, ScotRail

Heavy snow and ice have been causing travel disruption across the country - let's have a look at what services are being affected:

On the railways

Train provider LNER has advised customers not to travel between Edinburgh and Aberdeen as there'll be no trains running until 14:00 on Tuesday.

In Scotland, ScotRail say that given "substantial snowfall" in the last few days, people with train tickets dated between 2 January and 5 January can travel on Tuesday 6 January and Wednesday 7 January instead. Heavy snow across the country meant there were no ScotRail services along some key routes - such as between Dundee and Aberdeen - until today at midday.

In Wales, Transport for Wales shared that a disruption to services is expected until midnight as severe weather caused an incident between Llandudno Junction and Blaenau Ffestiniog. National Rail says services are also disrupted between Machynlleth and Pwllheli and between Wales and Manchester Piccadilly via Shrewsbury/Crewe.

Airports

Heavy snow has led to flight cancellations in Aberdeen and Liverpool - with the former announcing operations are being suspended until at least 17:00.

In an update, Liverpool Airport says it is due to stay closed until at least 14:00 today.

Meanwhile, things are reportedly stable at Manchester Airport, Heathrow, Bristol Airport and Edinburgh, as the airports tell the BBC it is business as usual for them.

Aberdeen Airport has suspended operations due to what it described as “deteriorating extreme weather conditions”.

Flights are to be grounded until at least 17:00, when a review will take place.

They advised passengers to contact their airline directly for more information.

Services to London Heathrow, Manchester, Amsterdam and Dublin are among those cancelled as a result.

Jacob Phillips
Live reporter

Image source, PA Media

Thousands of pupils hoping to be reunited with their school friends after the Christmas holidays will have to wait a little longer.

Hundreds of schools remain closed in parts of England, Scotland, Wales and Northern Ireland as the cold snap continues.

The north east of Scotland feels like the worst it's been in the past 15 years, our shivering Scotland team writes.

A yellow snow and ice warning is in place across the north of Scotland and will remain active until midnight tonight. Similar warnings are also in place in the north east of England, East Midlands, Yorkshire as well as the south west of England and parts of Wales.

The weather is also causing travel disruption, with Liverpool John Lennon Airport forced to close its runway, which remains covered in ice.

The runway at the City of Derry Airport is also closed while flights have been cancelled at Belfast International Airport.

Train services have also been cancelled or delayed, with Network Rail Scotland warning that “heavy and drifting snow” has stopped some services.

In Wales, emergency services have been called to motorists stranded in the snow and bus services have been suspended due to “atrocious” driving conditions.

But some people have been taking advantage of the icy conditions. A group were spotted playing ice hockey in a frozen, flooded field in Upware in Cambridgeshire while someone was spotted ice skating nearby.

Sophie Wallace
BBC News, reporting from Birmingham

It is a bad day to be a canal boat owner in Birmingham, the canal is frozen solid in the city centre.

On my walk to work earlier, the only things moving on the water were the local seagulls - all the boats were frozen in place.

Thankfully the pavement was not too frozen but I’d advise caution if you’re walking in the centre, wear sturdy shoes.

Meanwhile, the city looked picturesque and like it had been blanketed in icing sugar. The snow made the city feel about as calm as rush-hour Birmingham is able to be.

As we continue to bring you updates on travel disruption, we've seen a new "do not travel" warning put in place between Edinburgh and Aberdeen.

London North Eastern Railway is advising customers to avoid travelling between Edinburgh Waverley and Aberdeen until 14:00 GMT on Tuesday.

It says this is "due to heavy snowfall". We'll bring you any further updates as we get them.

Image source, LNER

Mairead Smyth
BBC North West

Image source, BBC/Brij Patel

We earlier reported the runway at Liverpool John Lennon Airport will remain closed until at least 13:00. That's now been extended to 14:00 at the earliest.

Staff say the issue was the overnight drop in temperature to about - 6C after heavy snowfall.

There were more than 30 cancellations alone this morning. Many people have had to rebook flights for later today or other days this week.

Efforts are continuing to clear the runway.

Image source, BBC/Brij Patel

Eurostar trains from King's Cross St Pancras are unable to reach the Netherlands due to the poor weather.

Eurostar has strongly advised passengers travelling between London, Rotterdam, and Amsterdam to postpone their journey.

"Please don't come to the station if your train is shown as cancelled," a statement says on the Eurostar website. "We regret that trains that can run will be subject to severe delays and possible last-minute cancellations."

Last week the Eurostar was thrown into chaos after a power supply problem caused significant disruption in the Channel Tunnel on Tuesday, leaving thousands struggling to travel ahead of New Year's Eve.

The runway at Liverpool John Lennon Airport will remain closed until at least 13:00 GMT.

The airport tells the BBC that there is still lots of ice on the surface but that its teams are working flat out to try and clear it.

A number of EasyJet flights to locations such as Belfast, Prague and Amsterdam have been cancelled due to the poor weather, according to the airport's departure board.

Several Wizz Air flights from the airport have also been cancelled.