Thousands of homes and businesses were left without power after being battered by Storm Gertrude, with savage winds of up to 144mph recorded in mountainous areas.
Around 8,500 properties in Scotland lost electricity, as well as thousands more across Ireland.
By early Friday evening power had been restored to 11,000 properties in Scotland, with fewer than 3,000 still down, said Scottish Hydro power company.
The Cairngorm mountains in the eastern Highlands saw monstrous winds of 144mph.
The Met Office also issued a red weather warning – the most severe – for Shetland, where gusts reached 105mph in Lerwick.
Inverbervie in Aberdeenshire and Orlock Head in Northern Ireland saw 80mph gusts.
Rare multicolour nacreous clouds, normally seen in polar areas, were spotted in Aberdeenshire.
In Ferryhill Station, County Durham, a mother and daughter were trapped in their car when a tree landed on them.
Police said they were “disappointed” that people ignored their cries for help and got out their phones to film the scene.
The mother, in her 40s, and daughter in her 20s were taken to hospital with minor injuries.
In Edinburgh, a man was treated in hospital for head injuries after he was struck by flying debris, while in Glasgow city centre officials shut roads.
Some schools on the Scottish islands were forced to shut, and Oxgangs Primary in Edinburgh closed after part of a wall was blown off.
A number of people were also injured on the A96 in Huntly, Aberdeenshire, when a lorry was blown over on to a car.
Earlier, a P&O ferry from Rotterdam to Hull was unable to dock due to extreme weather conditions.
A spokesman said the vessel experienced winds of 60 knots, which he described as “rare”.
In Ireland, some of the worst-affected areas were Stranorlar in Co Donegal and Killeshandra in Co Cavan.
Around 3,000 properties suffered blackouts in Killeshandra.
Outages were also reported in Wicklow, Westport, parts of Dublin, Athenry, Cong, Co Mayo, Roscommon, Limerick, Kerry and Wexford.
Around 5,000 customers were left without power In Northern Ireland.
A tree-lined avenue which provided one of the backdrops for the hit fantasy drama Game Of Thrones has also fallen victim to Gertrude.
A number of trees making up the famous Dark Hedges in Co Antrim came down in the high winds that have battered Northern Ireland.
Met Office amber “be prepared” warnings are in place for Northern Ireland, Scotland and northwest and northeast England.
The Environment Agency is urging people in southern England and parts of the North about the risk of renewed flooding over the weekend.
The River Ouse in North Yorkshire and the Severn at Shrewsbury are expected to be particularly high.