Severe gales and heavy rain are sweeping across the UK as travellers face disruption from Storm Ciara.
Airlines have cancelled dozens of domestic and international flights, while several rail firms have urged passengers not to travel.
Ferry passengers also face delays and cancellations, while drivers have been warned to take extra care.
Amber weather warnings for wind and heavy rain are in place for most of the UK, with gusts of up to 90mph expected.
Heathrow Airport said it had taken the joint decision with its airline partners to “consolidate” Sunday’s flight schedule in a bid to minimise the number of flights cancelled.
British Airways said it was offering flexible rebooking options for all customers on domestic and European flights flying to and from London Heathrow, London Gatwick and London City on Sunday.
Virgin Atlantic has posted a number of cancelled flights on its website.
Network Rail has imposed a blanket speed restriction of 50mph across the network on Sunday, warning passengers to only travel by train that day “if absolutely necessary”.
It said there was the potential for damage to overhead lines and tracks caused by debris or fallen trees.
The rail firms which issued “do not travel” warnings for Sunday were Gatwick Express, Grand Central, Great Northern, Hull Trains, LNER, Northern, Southeastern, Southern, Thameslink and TransPennine Express.
A gust of 86mph was recorded in Capel Curig in Snowdonia, Wales, overnight. High winds reaching 70mph have already caused travel disruption in Scotland and several bridges have been closed to high-sided vehicles.
In Perth, three people were hurt after part of a pub roof collapsed, though none of them was seriously injured.
Meanwhile, Southeastern train services have been disrupted by a trampoline blowing onto the line.
An amber warning for wind is in place across much of England and Wales until 21:00 GMT on Sunday. The Met Office advises wind-blown debris and large waves could pose a danger to life.
Yellow weather warnings now cover the whole of the UK until midnight on Sunday.
An amber warning for rain is in place in parts of Scotland, meaning homes and businesses are likely to be flooded and some communities could be cut off by impassable roads.
The heaviest rain is expected over high ground where 50-70mm is expected, with as much as 100mm in a few locations.
The Scottish Environment Protection Agency has issued more than 50 flood warnings – meaning flooding is expected – in Scotland, while there are 22 in place in England, and seven in Wales.
Gusts of 50-60mph are expected quite widely across inland areas as the storm passes over the country, reaching 80mph in coastal areas – particularly in south-east England and northern Scotland.