BRITAIN could be in for a long freezing winter as an El Nino is building and may bring a “Polar vortex”, the Met Office has warned.
Forecasters say weather patterns indicate there could be a sudden plunge in temperature across the nation in the second half of winter.
Met Office scientist Dr Jeff Knight said: “This year we have got a moderate El Nino event and when we have those what tends to happen is it favours more mild and wet and westerly weather in the early parts of winter.
“Then it transitions later to a higher chance of cold and dry conditions.”
He continued: “We have seen some reasonable mild and wet weather in recent weeks, so that is at least consistent with it.
“But we would expect that there is more chance as we go beyond Christmas.”
El Nino, along with La Nina, are complex weather patterns caused by variations in ocean temperatures in the Equatorial Pacific.
The term describes the fluctuations in temperature between the ocean and atmosphere in the east-central Equatorial Pacific.
El Nino is the warm phase while La Nina is the cold phase, and they occur usually every two to seven years – lasting for months at a time.
Dr Knight said: “These things seem peculiar to some people – that something happening so far away can have an influence on us.
WHAT IS AN EL NINO?
El Nino is a complex weather pattern caused by variations in ocean temperatures in the Equatorial Pacific and part of something called the El Nino-Southern Oscillation (ENSO) cycle.
The term describes the fluctuations in temperature between the ocean and atmosphere in the east-central Equatorial Pacific.
El Nino is the warm phase while La Nina is the cold phase.
These variations from normal surface temperatures have huge impacts on weather and climate around the world.
These phases usually can last between nine to 12 months but can last for years.
They occur usually every two to seven years.
El Nino is essentially caused by the interaction between the surface layers of the tropical Pacific Ocean and the atmosphere over it.
The water is warmer due to the trade winds reversing direction or becoming less intense.
“But the weather system is intricately interconnected on the timescale of a few days.
“So, signals from far away in the Pacific can then move into the north Pacific and that can then affect the polar vortex which can then affect us.”
He continued: “In the next few weeks I think we are looking at the polar vortex very carefully to see what is happening.
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“It has in the last few days oscillate in strength a bit, so we see these repeated cycles of weakening and strengthening.”
It comes as Brits are set for plunging temperatures, 50mph gales and the possibility of seven inches of snowfall over the weekend.
The Met Office is also forecasting gale-force winds in the West as a five-day freeze from Icelandic air chills the UK.
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News Pictures UK weather – Met Office forecasters warn Britain is in for long freezing winter as El Nino brings ‘Polar vortex’
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