Warning of more heavy rain after flash flooding and freak hailstorms
Scores of homes have been flooded, bridges washed away and people left with minor injuries as storms swept across the Yorkshire Dales.
Rescuers reported seeing sheds and oil tanks floating down roads as "100 or more" homes were affected.
An ice-cream parlour attraction said customers were injured in a freak hailstorm, and the site of a planned mountain biking festival was left devastated, with locals saying lives would have been lost if the event had already been running.
Steve Clough, of Swaledale Mountain Rescue, said: "The conditions were so bad that in the end only about 10 or 12 team members could make it there.
He told PA. "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.
North Yorkshire Fire and Rescue Service said it received around 115 calls to flooding incidents in Leyburn and Reeth on Tuesday evening.
A spokesman said: "We had several appliances as well as our swift water rescue teams and high volume pumping appliance within the area attending various incidents involving flooded properties and cars stuck in flood water."
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.
Pictures on the Swaledale Mountain Rescue Team Facebook page showed a bridge that had collapsed on the road between Grinton and Leyburn.
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: "Earlier today along with other areas of the region the farm here at Brymor was severely affected by the storms and flash floods.
"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.
Local farmer Raymond Caldert told BBC Breakfast that lives could have been lost if the festival had already been taking place.
He 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."
Mr Caldert added that he had not lost any livestock but the flood washed away most of his 160 bales of silage.
He said: "The bridge has gone. There's quite a few bridges have gone."
Train passengers faced disruption after a landslip between Carlisle and Skipton.
Northern Rail said trains had been suspended between Ribblehead and Kirkby Stephen.
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).
The Met Office has 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.
The Met Office said: "Rain will be persistent and heavy in places across parts of central, northern and eastern England and north-east Wales at first on Wednesday.
"During the day rain may turn more showery in places but with a higher chance of thunderstorms by afternoon.
"Some parts of northern England could see as much as 40mm-60mm (1.6in-2.4in) of rain through Wednesday, while thunderstorms could produce as much as 30mm-40mm (1.2in-1.6in) in 1-2 hours."
The unsettled weather is a continuation from Tuesday, when hailstones the size of sweets fell in some areas and others having a month's worth of rain in four hours.