Storms which left scores of homes and business flooded and roads and bridges washed away are to be followed by more heavy rain, forecasters have warned.
Rescuers reported seeing sheds and oil tanks floating down roads as “100 or more” homes in the Yorkshire Dales were deluged on Tuesday.
A bridge over Cogden Gill on Grinton Moor, which featured in the opening stage of the 2014 Tour de France and is due to be on the route of the prestigious UCI World Championships in September, was wrecked.
An ice cream parlour reported customers being injured in a freak hailstorm, and the site of a planned mountain biking festival was left devastated.
Steve Clough, of Swaledale Mountain Rescue, said: “The roads were a raging torrent and there were sheds and household oil tanks floating down them.”
Mr Clough said his team spent more than eight hours searching properties in the area, rescuing about 10 people, but he added that North Yorkshire Fire and Rescue Service helped many more and estimated “100 or more” homes had been affected.
“Some homes had a metre of water in them – it was horrific,” he said.
The fire service said it received around 115 calls to flooding incidents in Leyburn and Reeth on Tuesday evening.
Pictures and videos on social media showed widespread flooding across the Swaledale area in the Yorkshire Dales.
Roads resembled rivers, with many cars stranded, and fields were under water.
The Brymor Ice Cream parlour, near Masham, was caught in a freak hailstorm which left some customers with minor injuries.
The attraction posted on Facebook: “Our parlour suffered damage to the roof, power failures and some visitors suffered minor injuries.
“Our team of staff acted as quickly and professionally as possible to ensure all our visitors were made safe.”
Preparations for next weekend’s Ard Rock mountain biking festival were under way in Swaledale but the event has now been cancelled.
Farmer Raymond Caldert said: “I haven’t seen anything like this.
“We had a storm here about 20 years ago, called Hurricane Charlie. I think this has been worse.”
He added: “The bridge has gone. There’s quite a few bridges have gone.”
Train passengers also faced disruption after a landslip between Carlisle and Skipton.
Malham Tarn, in the Yorkshire Dales, had 3.2in (82.2mm) of rain in 24 hours, the majority in the space of four hours. The monthly average in the area for this time of year is 3.5in (89mm).
And the Met Office said storms could dump up to 1.6in (40mm) of rain in two hours in places on Wednesday.
A yellow weather warning for rain has been issued for parts of central and northern England, while a similar alert for thunderstorms is in place in Scotland.
There are 10 flood warnings in place across the UK – from North Yorkshire, Lancashire and the West Midlands – with the Environment Agency saying local flooding is possible due to the thunderstorms and outbreaks of heavy rain.