Shimla/Manali:

A stretch of the National Highway-3 was closed for vehicular traffic following a flash flood triggered by a cloudburst in Himachal’s Kullu district, police said on Thursday.

No casualty has so far been reported in the incident that occurred late Wednesday, they said.

According to officials, the stretch between Dhundi and Palchan Bridge on NH-3, also known as Leh-Manali Road, was affected due to the cloudburst at Anjani Mahadev nullah in the Manali area.

Vehicles headed to Manali from Lahaul and Spiti via the north portal of the Atal Tunnel have been diverted towards Rohtang, the Lahaul and Spiti police said in an advisory on Thursday.

It also asked the commuters to travel only if necessary, drive cautiously, and stay aware of the possible danger en route.

A total of 15 roads, including 12 in Mandi, two in Kinnaur and one in Kangra district were closed for vehicular traffic while 62 transformers were disrupted in the state on Wednesday night, the state emergency operation centre said.

There have been reports of damage to a power project and a few houses but these are yet to be confirmed by officials who are assessing the damage.

The local Met office on Wednesday issued a ‘yellow’ alert of heavy rain at isolated places in Himachal Pradesh for the next four days till July 28. It cautioned about damage to plantations and standing crops, vulnerable structures and ‘kutcha’ houses in the state due to strong winds and waterlogging in low-lying areas.

A total of 49 people have died in rain-related incidents in the state, which has suffered losses of approximately Rs 389 crore, since the onset of monsoon on June 27, the emergency operation centre said.

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Rescuers remove mud and debris as they search for people feared trapped after a landslide near a temple on the outskirts of Shimla, Himachal Pradesh state, Monday, August 14, 2023. Heavy monsoon rains triggered floods and landslides in India’s Himalayan region, leaving more than a dozen people dead and many others trapped, officials said Monday.
| Photo Credit: AP

Torrential rains that have battered India’s Himalayas in recent years, killing hundreds of people and causing billions of dollars worth of damage, are becoming more intense due to a clash of weather systems triggered by global warming, scientists said.

At least 240 people have died this year in the mountainous region as landslides and flash floods triggered by heavy rains buried homes and destroyed crops and infrastructure.

Seasonal monsoon showers are vital for India’s $3-trillion economy, bringing nearly 70% of the rain the country needs to water farms and refill reservoirs and aquifers.

But the monsoon’s convergence with a low-pressure weather system in the Himalayas in recent years has caused extremely heavy rains, something that scientists and officials have blamed on rising temperatures.

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“Think of it as a collision of two forceful systems,” said Kuldeep Srivastava, head of the India Meteorological Department’s regional centre in New Delhi.

“It causes significant rain, or even cloudbursts … we are noticing in the last few years, intense spells of rain lasting short durations,” he said, adding that this was due climate change driven by global increase in temperatures.

The number of very heavy to extremely heavy rainfall days per decade in India’s Himalayan states of Himachal Pradesh (HP) and neighbouring Uttarakhand increased to 118 between 2011 and 2020 from 74 in the preceding decade, data from the weather office showed.

At least 166 people have died in HP and 74 in Uttarakhand this year since June in landslides, flash floods and other rain-related incidents, according to government data.

Rains battered the two states following the convergence of the monsoon system with Western Disturbances, a weather system that originates in the Mediterranean Sea and moves east, bringing moisture-laden winds that cause winter rain and snow in the Himalayas.

Western Disturbances usually pass north of India’s northern border between the summer and monsoon months of June and October, but, as temperatures rise, some of them move slightly south, said V.P. Dimri, director of the Indian Institute of Geomagnetism.

“Because of sea surface temperature warming, the Western Disturbances have more energy … similarly, general warming of the earth is also leading to change in wind motions,” he added.

Monsoon rainfall patterns across India have seen a climatic shift in the recent decades, said Roxy Mathew Koll, a scientist at the Indian Institute of Tropical Meteorology.

“The most significant change is that instead of having moderate rains spread out through the monsoon season, we have long dry periods intermittent with short spells of heavy rains,” Koll said.