Severe cold weather, icy conditions and heavy snow are predicted to batter parts of the United Kingdom over the weekend and well into next week as forecasters predict the coldest late February in five years.
"By Thursday it is likely that it will be become exceptionally cold and day time temperatures may hover just around freezing or even below freezing in some places with widespread severe frost at night".
Disruptive snow showers are also expected from next Tuesday onwards, particularly in the east and southeast.
The weather warning is one of the longest ever issued, spanning from today until next Friday, 2 March.
Where are the Met Office snow warnings?
On that occasion Sheffield was blanketed under heavy snow which saw roads blocked and public transport affected.
It will be "exceptionally cold."
Meteorologists at The Weather Channel have predicted it will feel as cold as -7°C (-19°F) tomorrow as the Siberian "Beast from the East" takes hold. It will be breezy with fresh and gusty southeasterly winds, but strong near coasts and feeling rather cold in the wind.
Saturday night will be dry with good clear spells and easterly winds.
The bright and sunny spell of weather will continue into next week, but temperatures of -5 degrees are forecast in parts by Tuesday.
The coldest air is projected to affect eastern Europe and Scandinavia, where temperature departures from average could reach almost 40 degrees Fahrenheit below average for this time of year.
But over the weekend it will become "even colder with widespread overnight frosts and bitter by day with a marked windchill".