At least 24 people were killed and almost 100 went missing after a monster cyclone slammed into western India on Monday evening, compounding the country's woes as it battles a devastating coronavirus surge.

Hundreds of thousands of people were left without power after Cyclone Tauktae hammered the Gujarat coast.

Winds blowing at a speed of up to 130 kilometres per hour (80 miles per hour) smashed seafront windows and knocked over power lines and thousands of trees, blocking roads leading to affected areas, officials said.

The colossal swirling system is the latest of a growing number of increasingly severe storms in the Arabian Sea blamed on climate change.

“I have never experienced such intensity in my life,” a hotel owner in the town of Bhavnagar said. “It was pitch dark as power was cut off and winds were making a roaring sound. It was scary.”

One support vessel serving oil rigs that were walloped by eight-metre waves off Mumbai sank and 96 of the 273 people who had been on board were missing, the Indian Navy said on Tuesday.

The defence ministry said 177 people were rescued, with operations continuing in “extremely challenging sea conditions”. Two other barges and an oil rig were also in trouble.

Elsewhere, four fresh casualties were reported on Tuesday, including a child crushed by a collapsing wall and an 80-year-old woman killed by a falling pole, Gujarat chief minister Vijay Rupani said.

He added that over 16,500 houses were damaged, 40,000 trees were uprooted and 2,400 villages were without power.

“Since the cyclone made landfall we have not had power or communications,” local official Aayush Oak told AFP by phone from the coastal district of Amreli, where 40 to 50 mobile phone towers were damaged.

Although the cyclone was one of the fiercest in decades, better forecasting than in previous disasters meant that 200,000 people in danger zones were evacuated from their homes.

“Our planning over the last three days has paid off. We have managed to minimise human casualties,” said Rupani.

But challenges remain.

Forecasters warned of a tidal wave of one to two metres (three to six feet) in some areas as the cyclone barrelled inland weakening slightly but still bringing heavy rains and gale-force winds.

Covid catastrophe

The deadly weather system has hit as India's healthcare system struggles with a coronavirus surge that has killed a record 4,329 people in the past 24 hours.

Mumbai shifted about 600 Covid-19 patients from field hospitals “to safer locations”.

In Gujarat, all Covid-19 patients in hospitals within five kilometres of the coast were moved.

Authorities there scrambled to ensure there would be no power cuts in hospitals and 41 oxygen plants.

“Out of the 1,400 covid hospitals, power was disrupted in only 16. Power has been restored in 12 hospitals and four are working on generators,” Rupani said.

However, one Covid-19 patient died in the town of Mahuva after he could not be moved in time before the storm hit, doctors said.

The state also suspended vaccinations for two days. Mumbai did the same for one day.

Terrible double blow

“This cyclone is a terrible double blow for millions of people in India whose families have been struck down by record Covid infections and deaths,” said Udaya Regmi from the International Federation of Red Cross and Red Crescent Societies.

Last May, more than 110 people died after “super cyclone” Amphan ravaged eastern India and Bangladesh in the Bay of Bengal.

The Arabian Sea previously experienced fewer severe cyclones than the Bay of Bengal but rising water temperatures because of global warming was changing that, Roxy Mathew Koll from the Indian Institute of Tropical Meteorology told AFP.

“(The) Arabian Sea is one of the fastest-warming basins across the global oceans,” he said.The effects were felt far and wide with authorities in Nepal — some 2,000 kilometres (1,200 miles) from Gujarat — advising climbers on Everest and other mountains to stay put.

But more than 200 climbers ignored the warnings and were heading up the world's highest mountain, eyeing the summit by the end of this week, a government official at the base camp said.