If you haven’t been outside yet, we suggest wrapping up warm as it’s already pretty cold with more freezing weather on the way.
The UK is currently gripped at the start of a potentially lengthy cold snap as a result of stratospheric warming.
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Forecasters have warned that the meteorological event has disturbed the jet stream – allowing chilly winds from Eastern Europe to blast the UK – and could last well into March.
Over the weekend the Beast from the East will bring lows of -10°C in parts of Scotland and daytime temperatures next Monday that feel as low as -4°C.
The cold weather comes after a relatively mild period with temperatures reaching 14.2°C in Cardiff.
Today temperatures will reach highs of 9°C, but the mercury is going to continue falling over the next few days as the polar vortex grips the UK.
Describing sudden stratospheric warming, he said it was caused by a huge rise in air temperature in an area around 18 miles (30 km) above the North Pole.
‘There is a very big, very cold pool of air that circulates around the North Pole – sudden stratospheric warming, as it says on the tin, is when the stratosphere suddenly warms,’ he said.
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‘Last week we saw that take place – a sudden jump of around 50C – so that can disturb the way that cold pool of air moves around the North Pole very high up.
‘That can lead in around 70% of instances to it impacting the drivers that affect our weather in northern Europe as well.
‘So what we are seeing in this case is it disturbing the jet stream and weakening the jet stream.’
This, he said, will see the usual wet and windy conditions ushered out, and will allow high pressure to ‘build and dominate’ over northern Europe.
From the middle of the week Mr Claydon said this shift will allow an easterly breeze to establish and bring cold air towards Britain, with it feeling close to freezing in some parts.
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‘As that high pressure builds an easterly flow will start to develop and we will start getting an easterly wind and cold air moving in from Eastern Europe by the time we get to the weekend,’ he said.
Mr Claydon said sudden stratospheric warming and its impact on British weather is ‘not a yearly occurrence but is not unheard of’, and last impacted the UK in 2013 and 2009.
‘These colder conditions are expected to last into next week and could be fairly prolonged, and could still be with us into the beginning of March,’ he said.
The Met Office also said there could be some frosty nights, and warned that into next week even colder air from Russia could move across the country.
But the forecasters said that although the risk of snow is very low this week, due to the dry nature of the air, this could change after the weekend.
Dr Thomas Waite, of Public Health England’s extreme events team, urged people to check on friends, family and neighbours during the cold snap, and to make sure their homes are heated to at least 18C.
He said: ‘With the days feeling a little longer and lighter it can be easy to forget that cold weather can still kill.
‘Over 65s, those with conditions like heart and lung diseases and young children, are all at particular risk in cold weather as their bodies struggle to cope when temperatures fall.’
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