The Met Office is warning of snow in Wales on Sunday, January 24.
The yellow warning says an area of rain on Sunday could "readily" turn to snow.
It states: "An area of rain will cross the west and southwest of the country on Sunday morning and turn readily to snow as it spreads eastwards, and also lead to some icy surfaces.
"Mainly 1-3 cm of snow accumulation for most parts, but possibly 5-10 cm over 100 m with a small possibility of 10-15 cm over high ground for example on the Brecon Beacons and Snowdonia.
"These snow amounts will cause some disruption to transport, especially on routes that cross even modest high ground."
The areas covered by the warning that is place from 3am on Sunday until 6pm:
- Blaenau Gwent
- Bridgend
- Caerphilly
- Cardiff
- Carmarthenshire
- Ceredigion
- Conwy
- Denbighshire
- Flintshire
- Gwynedd
- Merthyr Tydfil
- Monmouthshire
- Neath Port Talbot
- Newport
- Pembrokeshire
- Powys
- Rhondda Cynon Taf
- Swansea
- Torfaen
- Vale of Glamorgan
- Wrexham
Met Office weather forecaster Aidan McGivern said the effect of the sudden stratospheric warming that happened above the North Pole at the start of January is being seen now.
Aidan said: "It increases the chances of cold weather across the UK a couple of weeks after the event – it doesn't automatically lead to a Beast from the East, however we are seeing colder than average weather.
"It is turning colder because the sudden stratospheric warming has pushed the jet stream to the south of the UK.
That means on Saturday and Sunday the UK will be to the north of the jet stream and we will see frost and ice during the mornings and below-average temperatures throughout."
Weather for your area by postcode:
The five-day Met Office forecast for Wales:
Today:
A frosty start with icy stretches and snow over the hills. Dry with sunny spells through the morning before cloud thickens during the afternoon bringing scattered wintry showers. Feeling cold with lighter winds. Maximum temperature 6 °C.
Tonight:
Scattered wintry showers turning to snow overnight, accumulating over hills and at lower levels for some. Feeling cold with widespread frosts and icy patches. Minimum temperature -4 °C.
Saturday:
Scattered wintry showers with sunny intervals continue to affect Wales with the clearest and driest spells over South Wales. Becoming largely clear and dry overnight. Feeling cold with light winds. Maximum temperature 6 °C.
Outlook for Sunday to Tuesday:
Occasional rain and snow, mainly over the hills in the south and clearing during the afternoon on Sunday. Sunny spells with scattered showers on Monday. Heavy rain on Tuesday. Feeling cold throughout.
