Gale winds of up to 70mph are due to hit the UK this week as Storm Hector descends, with the Met Office warning of a threat to life.
A yellow warning has been issued across Scotland, the North of England and Northern Ireland, as the high winds come from across the Atlantic.
This follows a weeks-long spell of sunshine and warmth, as Britian basked in an unusually hot start to summer.
The storm could disrupt royal proceedings; the Queen and the Duchess of Sussex are due to have their first official engagement together as they open Cheshire's Mersey Gateway Bridge.
Although there is not a weather warning yet for that area, they could face some stronger winds than usual.
The Met Office said: "The strongest winds will reach the west coast during the early hours of Thursday before spreading eastwards during the day.
"Westerly winds are likely to gust between 50 and 60mph in many areas and possibly around 70mph in some exposed locations. Winds should gradually ease from the west during Thursday afternoon.
"In addition, a spell of heavy rain will accompany the wind with the highest rainfall totals over parts of western Scotland."
Met Office forecaster Sophie Yeomans added: "Over the rest of England and Wales it will just be a strong, blustery day.
"With any outdoor events planned, it may be something people are unprepared for or come as unexpected compared to the weather we have had recently."
Travel disruption is expected, and road, rail, air and ferry services could be badly affected.
It is also possible some buildings may be damaged, with a slight chance of power cuts in some parts - with the strongest winds expected in Argyll, near Oban.
While the storm may dampen some outdoor plans, the Met Office is confident the hot, sunny weather should return before long, with the end of June set to be drier.