‘Sudden stratospheric warming’ forecast to hit northern Europe in January – but experts unsure where it will strike
The UK could find itself in the deep freeze in January due to a change in wind patterns high up in the atmosphere – the same phenomenon that blew in the bitterly cold Beast from the East in 2018.
However, forecasters are warning it is too soon to tell where in Europe the cold weather will strike.
The “increased likelihood” of a freezing spell is due to a phenomenon called a ‘sudden stratospheric warming’ (SSW) that is forecast for early January, which can bring plunging cold temperatures a week or so later.
Professor Liz Bentley, chief executive of the Royal Meteorological Society, said: “When you get an SSW it increases the likelihood of a prolonged cold spell across Northern Europe, like the Beast from the East.”
But it is “hard to say” exactly where it will hit, she said. “It could impact the UK, it has the potential to, but I wouldn’t like to say it’s likely to.”
But the Met Office urged more caution. Spokesperson Stephen Dixon said: “It’s too early to tell if there will be a sudden stratospheric warming (SSW) event at the moment.
“Forecast models suggest a much weakened polar vortex over the coming weeks, but it’s not clear if this will result in an SSW or exactly how this will influence the UK’s weather patterns at this range.”
What is Sudden Stratospheric Warming?
An SSW happens when polar vortex winds in the stratosphere – the layer of atmosphere at 10-50km above Earth – slow, stop or reverse direction.
This leads to rapid warming in the stratosphere by up to 50C, but a few weeks later this also disrupts the jet stream, which affects our weather lower down.
As the jet stream starts to “wobble”, it allows cold air usually locked above the Arctic to seep further south in some areas of the Northern Hemisphere, said Prof Bentley.
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There are major disruptions on the A9 in Scotland due to heavy snow
How will it affect our weather?
“Now the crux of what we are looking for is where the waves [in the jet stream] will be,” added Prof Bentley.
“When we have an SSW it increases the likelihood of a cold spell across a large region like Europe or North America, but we wouldn’t get a feel for the actual position until four or five days out.
“Exactly where is hard to pinpoint. But there is an increased likelihood of very cold spells for certain regions.”
Professor Andrew Charlton-Perez, a meteorologist from the University of Reading, said SSWs are also associated with “weaker westerlies for Europe and even easterlies, in some cases.”
“Given westerly winds tend to give more mild weather in winter, that can bring much colder weather across Western Europe.”
He added: “We know Europe will be cold, but it is difficult to be precise where, this far out.”
A car gets stuck in snow in Hayfield in Derbyshire during the “mini beast from the east” in 2018
When will it happen?
An SSW is on the cards for the next week, but it takes another week or so after that before the knock-on impact on the jet stream.
A cold spell is forecast for the second week of January, but it could kick in later, or last until February, said Prof Bentley.
The current Met Office forecast for mid-January projects an “increased chance of colder than average conditions during this period, and a reduced chance of prolonged periods of very unsettled / milder conditions with frequent rain and wind pushing in from the Atlantic.
“Currently the chance of widespread severe cold is still deemed low, but still the risk of impacts from cold, ice and snow is greater than normal.”
Will the UK see another ‘Beast from the East’?
An SSW doesn’t always bring cold conditions to the UK, because it depends on where the jet stream “wobbles”.
The Beast from the East in 2018 was caused by an SSW that allowed cold air to flow in to the UK from Siberia in the east.
But another SSW in 2019 “didn’t have a strong influence on Europe”, said Prof Charlton-Perez.
In any case, the UK is likely to see more settled weather than the recent wind and rain, said Prof Bentley.
Donald Trump has said that his 28-point peace plan for Ukraine is “by far” not the “final offer”, ahead of crisis talks in Geneva.
Meeting on the sidelines of a G20 summit in South Africa, European and other Western leaders scrambled to respond to the US president’s demand for Ukraine to accept the plan drawn up by the Trump administration and the Kremlin.
In a joint statement on Saturday, they said the plan announced on Friday could serve as a basis for talks to end Russia’s war in Ukraine but required “additional work”.
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How Ukraine peace plan came about
Follow the latest on the Ukraine peace plan
As a result, a meeting has been hastily convened in Geneva, Switzerland, on Sunday, where national security advisers from the E3 – France, Britain and Germany – will meet EU, US and Ukrainian officials for further discussions.
Ahead of the talks, Volodymyr Zelenskyy said in a video address to his nation that Ukrainian representatives at the talks “know how to protect Ukrainian national interests and exactly what is needed to prevent Russia from carrying out” another invasion.
“Real peace is always based on security and justice,” the Ukrainian leader added.
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PM: ‘More to do’ on US Ukraine peace plan
The 28-point peace plan closely resembles the list of demands repeatedly stated by the Kremlin since it launched its full-scale invasion of Ukraine nearly four years ago and if adopted, would see Ukraine cede territory to Russia – and cut the size of its military.
Mr Trump has said he wants a response from Ukraine by Thursday, while suggesting an extension could be possible.
On Saturday, Mr Trump told reporters outside the White House that the plan was not the “final offer” when asked.
He said: “We’d like to get the peace, it should’ve happened a long time ago. The Ukraine war with Russia should’ve never happened. If I was president, it would have never happened. We’re trying to get it ended. One way or another, we have to get it ended.”
His secretary of state Marco Rubio insisted that the peace proposal was authored by the US, despite what a handful of senators have alleged.
“It is based on input from the Russian side. But it is also based on previous and ongoing input from Ukraine,” he said.
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The 28-point peace plan explained
Leaders have sought to balance praise for President Trump’s attempt to end the war with recognition that some terms in his proposal are unpalatable for Kyiv.
“There are many things that cannot simply be an American proposal, which requires broader consultation,” French
President Emmanuel Macron said on the sidelines of the G20, adding that an agreement had to allow for peace for Ukrainians and “security for all Europeans”.
German Chancellor Friedrich Merz underlined the importance to Europe of supporting Ukraine.
“If Ukraine loses this war and possibly collapses, it will have an impact on European politics as a whole, on the entire European continent. And that is why we are so committed to this issue,” he said.
“There is currently an opportunity to end this war, but we are still quite a long way from a good outcome for everyone.”
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Keir Starmer calls for growth plan at G20
Prime Minister Sir Keir Starmer told reporters in Johannesburg: “We are concerned about [caps on military], because it’s fundamental that Ukraine has to be able to defend itself if there’s a ceasefire.”
He said the proposal “requires additional work”, adding: “And that’s why there’s been the agreement that in Geneva tomorrow [Sunday], you’ll have senior US personnel, you’ll have European NSAs [national security advisers], including the UK NSA, and obviously Ukrainians there to work further on the draft.”
Sir Keir also spoke to Mr Trump, relaying discussions held at G20 to the US leader, according to a Downing Street spokesperson, who added that the two leaders would speak again on Sunday.
Meanwhile, Sir Keir, who has defended his decision to fly to the G20 days before a difficult budget, said the role of the G20 is “critical at this moment”.
“The G20 has worked together before to fix fundamental problems in the global economy. We need to find ways to play a constructive role again today in the face of the world challenges,” he said.
“I’d like to see us come together around a five-point plan for growth that leaves no one behind.”
Sir Keir Starmer, Emmanuel Macron and Friedrich Merz at the G20 summit. Pic: PA
The US, however, is boycotting the talks.
The Trump administration made its opposition to South Africa’s G20 agenda clear earlier this year when the country started holding meetings ahead of the summit. South Africa gets to set the agenda as the country holding the rotating G20 presidency.
G20 leaders broke with tradition and adopted a declaration at the start of their summit – despite opposition from the US.
Vincent Magwenya, spokesman for South African president Cyril Ramaphosa, said a leaders’ declaration was adopted unanimously in Johannesburg.
The White House later accused South Africa of refusing to facilitate a smooth transition of the G20 presidency.
Pic: AP
Read more:
Analysis: Europe scrambles at G20 over Ukraine peace plane
G20 lands in South Africa: But who feels forgotten?
The G20 bloc was formed in 1999 as a bridge between rich and poor nations to confront global financial crises.
While it often operates in the shadow of the powerful Group of Seven nations, G20 members represent around 85% of the world’s economy, 75% of international trade and more than half the global population.
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