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Met Office Issues Snow Verdict as 'Polar Vortex' Could Bring Colder Weather to Essex
The Met Office says a weaker polar vortex could disrupt the jet stream and raise the chance of wintry showers, ice or snow, forecasters said.
The Met Office warned that the stratospheric polar vortex is weakening at the earliest date in at least 75 years, a highly unusual event potentially linked to the record-breaking climate phenomenon currently developing in the Pacific.
Strong winds 15-50km above the Arctic trap cold air during winter, but when these winds weaken, the jet stream can shift, allowing freezing Arctic air to move southwards towards Europe.
Jeff Knight, lead climate scientist from the Met Office, told the BBC: "It would appear to be the earliest on record looking back over the 75 years we've been observing … with most experts agreeing this is a very unusual event."
Dr Matthew Patterson, a climate scientist at the University of St Andrews, said the event "changes the odds" to make colder weather more likely, though wintry showers and ice may reach Essex in the coming weeks.
Professor Amanda Maycock, a climate scientist at the University of Leeds, warned long-term forecasts show "a very high chance of one of these events happening again later on in the winter," potentially prolonging drought conditions.