The man who died in a landslide in Carmarthenshire, west Wales, on Saturday has been named by police as Corey Thomas Sharpling, 21.

His family said: “We are heartbroken at the tragic loss of our beautiful son Corey. Many knew his wit, charm and sense of loyalty and we take those things with us in our hearts.”

Large swathes of Wales and England were mopping up on Sunday after more than a month’s rain fell within a few hours as Storm Callum swept across the UK over the weekend.

A second man died on Saturday after entering the sea in Brighton. Homes and businesses were flooded, and rail and road journeys made hazardous or impossible.

Sharpling died in a landslip on the A484 near the village of Cwmduad while he was on the way to working a shift at McDonald’s. The bus he was travelling in had stopped after a tree blocked the road.

Residents said he got out and was watching council workers tackle the problem when he was hit by falling rocks and earth. A woman who lived nearby said: “There was a loud rumble as some of the valley side slipped down the hill. This poor lad was hit by the full force of it, he didn’t stand a chance. It was a freak accident. If he’d stayed on the bus he would have been fine.”

Sharpling’s girlfriend wrote on Facebook: “I lost the love of my life he was everything I always wanted and you have sadly been taken from me and your family by a terrible accident earlier tonight. I want you to know that I will always love you forever and always.”

The clean-up and travel disruption from Storm Callum was expected to last into Monday and beyond, but forecasters said the weather would become calmer over the next few days.

The contrast in the weather across the UK over the weekend was extraordinary. The wettest place was Libanus in the Brecon Beacons, south Wales, where 198mm of rain fell in 36 hours, well above its monthly average for October of 146mm.

Storm Callum: rivers burst banks in Wales as downpours intensify Read more

On Donna Nook salt marsh on the Lincolnshire coast, the temperature reached 26.5C on Saturday, the highest October temperature in the UK for seven years. By 2pm on Sunday, however, the Lincolnshire coast was a relatively chilly 10C.

Natural Resources Wales said some of the flooding in Carmarthenshire, south-west Wales, was the worst for 30 years. More than 70 flood warnings and alerts were put in place in Wales and England over the weekend.

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The former Carmarthen mayor Alun Lenny, said: “These are the worst floods to hit Carmarthen since 1987. The old town bridge was shaking with the force of the water.”

Other towns affected included Crickhowell in Powys and Cardigan and Aberaeron in Ceredigion, where the storm damaged boats in the harbour.

The deputy chief constable of Dyfed-Powys police, Darren Davies, tweeted: “Awful weather conditions for communities but superb effort in response by police staff, PCSOs and officers. This included incredible acts of bravery which no doubt saved life. Truly amazing stuff, which doesn’t get counted in stats but is priceless.”

On its first day as Wales’ new rail operator on Sunday, Transport for Wales said several trains suffered “significant damage” during the storm. “This will result in services being altered and operating with reduced capacity on Monday,” it said in a statement.

Sussex police said a 38-year-old man died after entering the sea in Brighton in the early hours of Saturday. A spokesperson said: “Sussex police received a report of a man in the sea near West Street, Brighton, at 1.21am on Saturday.

“Coastguards, police and the South East Coast Ambulance Service attended the scene. The man was retrieved from the water but was sadly pronounced dead at the scene. Next of kin have been informed and the matter has been passed to the coroner’s officer.”

Floodwater also caused a 1.8m (6ft) hole to open up beneath the rail track along the Teignmouth Estuary in Devon.