The Met Office has issued a yellow 'be aware' warning for Pembrokeshire and the whole of Wales for snow and ice tonight (Thursday) and tomorrow (Friday).
The Met Office said: "Showers will become frequent on Thursday evening and heavy at times, increasingly turning to snow on high ground and inland, with a longer spell of sleet and snow moving southeastwards across Wales and into parts of the West Midlands and Westcountry overnight.
"Snow accumulations of 5-10 cm are likely across Wales above 200 metres, with 1-4 cm possible at low levels well inland from the coast.
"Ice is also likely to form on untreated surfaces."
The chief forecaster added: "A cold, unstable northwesterly airstream covers the UK.
"This will bring showers, which will become heavier, more frequent and increasingly wintry later on Thursday.
"In addition, a trough will bring a more persistent spell of sleet and snow southeastwards overnight - most of the snow falling across Wales, but smaller amounts may feed down into some western parts of England.
"Amounts of snow towards the south and east of the warning area are uncertain and many places will see very little, but ice will be a likely hazard in any case."
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