Northern peaks will be battered by strong winds which could collide with falling snow to create blizzards.
Freezing temperatures will see rain, sleet and snow fall on the UK's mountains this weekend.
Peaks in Snowdonia, the norther Pennines and the Highlands will all be hit with a flurry of the white stuff.
And today (February 21) gusts of 65 mph could lash south east Scotland and north east England as yellow weather warnings for wind and rain have been issued.
The alerts are in place throughout most of today, when forecasters warn of travel chaos and more flooding.
Matthew Box, forecaster at the Met Office, said: "We have strong wind warnings out for Friday in south east Scotland and north east England. They could hit 55mph to 65mph.
"There will also be widespread coastal gales across the north of Scotland and Northern Ireland.
"We could have blizzard conditions at a time if you're stuck on the top of a mountain."
The meteorologist predicted there could be 20cm of snowfall on mountains in Scotland.
Check the weather forecast near you:
Snow is already falling across parts of Snowdonia National Park and the hills in north and central Wales, according to radar images.
BBC senior forecaster Derek Brockway tweeted: "Sharp cold front and rain moving across the #UK this morning.
"Snow falling on the hills and mountains in #Wales. Drier, clearer weather over #Ireland with broken cloud, sunshine and scattered showers. Turning noticeably colder with a drop temperature and change in wind direction."
According to the Met Office, parts of South Wales, including Cardiff, Newport and Swansea will feel like 1C.
Areas along the coast may feel even colder, with some places expected to feel like -1C.
But temperatures are expected to climb to around 7C around the coasts and as high as 10C for inland areas over the weekend.
In Bristol, the mercury is expected to hover around 10C for most of today, but the feels like temperatures will dip to as low as 3C.
There is no rain predicted for both Friday and Saturday but the downpours will return by Sunday.
UK weather forecast
Friday:
A windy day with gales in places, especially northeast England and southeast Scotland. Mainly dry and bright in the south, but cloudy with rain further north, particularly over hills.
Outlook for Saturday to Monday:
Northern areas windy with sunny spells and wintry showers over weekend, occasional rain in the south. Further wet and windy weather on Monday, especially in the north with snow possible.
