"A band of showers will affect Atlantic coastal counties late in the night, some with hail and a risk of sleet
on high ground.
Britain is braced for a raw cold snap with an easterly wind chill pushing temperatures down with a risk of sleet
or snow falling in many areas.
Huddersfield weatherman Paul Stevens has warned that temperatures could get as low as minus 3degC tomorrow night, with the risk of sleet
or snow over the next 48 hours.
But there is a strong risk of sleet
and snow showers across many areas late Wednesday to Thursday.
Weather forecasters said there was a risk of sleet
and snow over high ground in North Wales overnight.
Forecaster Jim O'Brien said: "Daytime temperatures look like dropping down near zero towards the end of the week with a further risk of sleet
This means there is a risk of sleet
and snow almost anywhere.
Conditions will worsen on Sunday with a risk of sleet
towards early evening.
Friday will also see a growing risk of sleet
and snow on Scotland's high ground.
"Sleet and snow is forecast for high ground and there is a risk of sleet
on lower levels away from the coast.
"Christmas Eve and Christmas Day looK set to be much the same, with mainly wet and windy weather but also some RISK of sleet
"There's also a risk of sleet
or snow during Tuesday but it's fairly unlikely anything will settle because of the ground being warm.
'There is a risk of sleet
and snow showers over the Welsh mountains but for most of the country on Saturday there will be more cloud and a possibility of drizzle.'
Experts say, however, air from the Arctic mass in the middle of next week will bring snow to the north and the risk of sleet
in the south.
"Tomorrow there is still a risk of sleet
and snow showers, possibly heavy, but again widespread ice looks like it will cause the main problems."