Temperatures are set to nose-dive across the UK, with fears that bitterly cold winds from the east could bring a blanket of snow.
Relatively mild weather is expected to deteriorate from Wednesday onwards, with the onset of icy gusts from Scandinavia.
And with temperatures forecast to fall close to freezing, the chances are increasing of another batch of snow as the weekend arrives.
Sky News meteorologist Christopher England said: "The really cold days are going to begin on Wednesday, when we'll see some easterly winds coming in from Scandinavia.
"At the moment we've got temperatures of around seven, eight or nine degrees Celsius (44.6-48.2F), but it will be more like two or three (35.6-37.4F) later in the week.
"That will certainly mean widespread overground frost.
"Those sorts of temperatures are going to last into the weekend, when we might even see some snow flurries in the south.
"It will be cold enough for snow, but that's all we can say at this stage."
Parts of the country received up to four feet of snow at the end of January.
The weather left hundreds of motorists stranded as travel networks were crippled, with disruption continuing as melting snow and heavy rain caused flooding.