Survivors of the worst natural disaster to hit Spain this century awoke to scenes of devastation on Thursday after villages were wiped out by monstrous flash floods that claimed at least 95 lives.

The death toll could rise as search efforts continue with an unknown number of people still missing.

The aftermath looked eerily similar to the damage left by a strong hurricane or tsunami.

The clean-up after floods in Utiel (Manu Fernandez/AP)

Wrecked vehicles, tree branches, downed power lines and household items all covered in a layer of mud covered the streets of Utiel, just one of dozens of towns in the hard-hit region of Valencia, where 92 people died between late Tuesday and Wednesday morning.

Walls of rushing water turned narrow streets into death traps and spawned rivers that ripped into the ground floors of homes and swept away cars, people and anything else in its path.

“The neighbourhood is destroyed, all the cars are on top of each other, it’s literally smashed up,” said Christian Viena, a bar owner in the Valencian village of Barrio de la Torre.

Regional authorities said late on Wednesday it appeared there was no-one left stranded on rooftops or in cars in need of rescue after helicopters had saved some 70 people.

But ground crews and citizens continued to inspect vehicles and homes that were damaged by the onslaught of water.

More than a thousand soldiers from Spain’s emergency rescue units joined regional and local emergency workers in the search for bodies and survivors.

The defence minister said that soldiers alone had recovered 22 bodies and rescued 110 people by Wednesday night.

“We are searching house by house,” Angel Martinez, official of a military emergency unit, told Spain’s national radio broadcaster RNE on Thursday from the town of Utiel, where at least six people died.

Spanish Prime Minister Pedro Sanchez is heading to the region to witness the destruction first hand as the nation starts a three-day period of official mourning.

Residents walk next to cars piled up after being swept away by floods in Paiporta (Alberto Saiz/AP)

Thousands of people were left without water and electricity and hundreds were stranded after their cars were wrecked or roads were blocked.

The region remained partly isolated with several roads cut off and train lines interrupted, including the high-speed service to Madrid, which officials say will not be repaired for several days.

While Valencia took the brunt of the storm, another two casualties were reported in the neighbouring Castilla La Mancha region. Southern Andalusia reported one death.

The relative calm of the day after has also given time to reflect and question if authorities could have done more to save lives.

The regional government is being criticised for not sending out flood warnings to people’s mobile phones until 8.00pm on Tuesday, when the flooding had already started in some parts.

Spain’s Mediterranean coast is used to autumn storms that can cause flooding. But this was the most powerful flash flood event in recent memory.

Scientists link it to climate change, which is also behind increasingly high temperatures and droughts in Spain and the heating up of the Mediterranean Sea.