Cold weather will be driven by a rapid warming of air over the North Pole opening the floodgates to winds from the Russian Arctic.
Is Britain set to freeze as snow and biting polar winds set to make it feel like -11C
A so-called Sudden Stratospheric Warming (SSW) threatens to keep Britain on ice into the start of spring on March 1.
The last major SSW event happened in January 2013 and was followed by one of the coldest Marches on record.
The Met Office advised "Temperatures will turn colder for most with wind from the east or northeast, possibly brisk in SE England. The cold weather will be mainly dry initially with a chance of snow flurries in the east and southeast. Heading into the following week, there is an increased chance of snow for many, especially in the south and east. Although the location and timing of any snowfall remains uncertain. However, some milder unsettled weather may still occur at times, especially in the west".
Published February 18, 2018