Freak high-pressure dome to bring freezing Arctic blast as 40-year record set to be broken
Bitter gusts will make it feel close to -10C in some parts of the UK
Snow
Arctic cold snap could bring snow back in play as Polar chill to send mercury plummeting
The driver is a powerful jet stream fuelled by a cold plunge over Canada and the US
UK weather: Britain to be blasted by Christmas storms after freak shift over Arctic
The weather phenomenon is triggered when shifts in global wind patterns disrupt the circular flow of air high over the North Pole
