Julian Mayes, a senior forecaster with MeteoGroup, said: "There is already snow over most of Scotland, and rain currently over Northern Ireland and Ireland is moving east. It is expected that places in Wales and western England will have a fall of heavy snow by evening (on Friday), and that's going to keep moving eastwards.
Temperatures will start to go up tomorrow (Saturday), and then we will have unsettled, windy weather. There will be a risk of flooding. It's not just the melting snow, but the fact we are back in significant rainfall for the first time in some weeks."
The death toll during the recent cold snap, which is in double figures, is thought to have risen further as it is feared a man in his 30s or 40s may have frozen to death after going missing in woodland.
His body was found on Thursday night after four friends went into Newmarket police station in Suffolk reporting that he had not been seen for four days. The men had been searching for him and found him dead in a wooded area.
The death is being treated as unexplained but one theory is he died in the freezing temperatures.