Storm Conor has battered Britain on Boxing Day, bringing snowfall, heavy rain and strong winds to parts of the country.
The weather system, which is expected to cause gusts of up to 90mph, follows an 'exceptionally mild' Christmas.
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Festive travellers are being urged to check before setting off on their journeys, with the storm having already sparked disruption.
The Met Office has issued amber "be prepared" warnings for Orkney, Shetland and the most northerly part of the Highlands, in Scotland.
Drivers in Glasgow were confronted by minor flooding and rain-slicked roads this morning after rain struck parts of the city.
Elsewhere, residents were waking up to snow-covered streets as forecasters warned of "the potential of blizzard conditions".
One man, Kevin Hay, tweeted a picture showing snowy homes and cars in Aberdeenshire.
He captioned the wintry snap: "Was not expecting this today! #snow #aberdeenshire #scotland #brrr #cold #freezing."
Another user, Allan McIntosh, posted an image of snow in the village of Balmedie.
He said: "One day late for a white Christmas, wasn't expecting this for a dog walk today."
And a third, Candy Gellatly, wrote: "Had a wee bit of #snow overnight where we spent Christmas... #scotland #BoxingDay."
The storm, which follows Storm Barbara, which cut electricity to more than 25,000 homes, has brought an end to unseasonably warm weather.
On Christmas Day, the mercury rose to 15.1C in Dyce, Aberdeenshire - pushing the record of 15.6C registered in Devon in 1920.
But just a day later, Brits are being warned of 'much colder' temperatures - with rain, snow showers and gusts of up to 90mph in some areas.
The Met Office says on its website it is expected to be "very windy" across parts of Scotland today - particularly in the north-east.
"Elsewhere, much drier and brighter than Christmas Day although feeling much colder too with temperatures near normal," it states.
Yesterday, the national weather service had issued a yellow "be aware" wind alert for the Highlands, Western Isles, Orkney and Shetland.
A gust of 85.5mph was recorded at Scalpay Bridge in the Outer Hebrides on Sunday, while at Castlebay in Barra speeds reached 74.9mph, the Western Isles Council said.
Emma Salter from the Met Office said it had been an "exceptionally mild" Christmas, but warned of falling temperatures and difficult conditions on Boxing Day.
Speaking yesterday, she said: "Up in Scotland we have seen some quite strong gusts today already, 60mph winds, and some large waves too.
"That wind is due to strengthen tonight, and coupled with the snow it could be quite a difficult day tomorrow for people trying to get out and about, particularly the ferries and transport networks.
"There is the potential for blizzard conditions temporarily as well in that strong wind and snow."
Christmas Day was mild across the UK, with a high of 15C in Hull and 14.7C in Exeter.
But temperatures will fall to lows of 6C in parts of northern England, closer to the December average, the forecaster added.
Snow affected several routes in the north east of Scotland, while restrictions were put in place on many bridges due to the windy conditions.
The Dornoch Bridge was also closed.
And alerts were put in place for the north west and north east of England, and Yorkshire and Humber, where gusts of around 50-60mph are forecast.
Elsewhere, gales could hit parts of Grampian and Strathclyde, according to forecasters.
Meanwhile, snow alerts have been issued for central Scotland northwards as Storm Conor drags Arctic air across the region as it passes to the north of the country.
Snow accumulations of 5cm to 10cm are expected above about 200 metres, and 10cm to 15cm above about 400 metres, with drivers warned to be aware of icy patches.
Flood alerts are in place covering Tayside, Caithness and Sutherland, Orkney, Scottish Borders, Shetland, Skye, Easter Ross and Great Glen and Lochaber and the Western Isles, while local flood warnings have been issued for Tayside and Caithness and Sutherland.
Scotland's Transport Minister Humza Yousaf chaired a meeting of the Scottish Government's resilience team on Sunday with representatives of the Met Office, Transport Scotland, Police Scotland and the Scottish Environment Protection Agency (Sepa).
Speaking ahead of today, he said: "Our responders in the north have scarcely had a chance to recover from these conditions but now Storm Conor is set to bring the next test during Boxing Day.
"Of course many people will be travelling to meet loved ones and spend time with their families at this time of year and we would remind the public to check before they travel and delay their journey if they have to.
"Safety must be paramount and should take priority."