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Clear heavens, calm winds and a panoramic vista of Himalayan summits draped in white powder - this describes the fall setting that hikers on Mount Everest have come to love.

But that appears to be shifting.

Changing Climate Conditions

Climate scientists say the monsoon now stretches into autumn, which is traditionally the high-altitude travel season.

During this prolonged conclusion of monsoon, they have recorded at least one occurrence of heavy rainfall almost every year for the past decade, with mountain weather becoming increasingly risky.

Latest Crisis on Everest

Last weekend, a sudden snowstorm trapped hundreds of travelers near the eastern face of Mount Everest for days in freezing temperatures at an elevation of more than 4,900m.

Approximately 600 hikers were guided to security by the conclusion of Tuesday, according to sources.

A single individual had succumbed from extreme cold and mountain sickness, but the others were said to be in stable health.

Comparable Incidents Across the Region

This was on the Tibetan side but a comparable situation had occurred on the Nepal slope, where a South Korean mountaineer died on Mera Peak.

The international community learned much later because communication lines were disrupted by heavy downpours and significant snow accumulation.

Officials calculate that mudslides and flash floods in the region have claimed the lives of around sixty people over the past week.

"This is highly atypical for autumn when we anticipate the weather to stay calm," stated Riten Jangbu Sherpa.

Business Impact

Given this is the favored period, frequent storms like this have "affected our trekking and mountaineering business," he continued.

The monsoon season in the Indian subcontinent and Nepal typically continues from June to mid-September, but not anymore.

"Research indicates that the majority of the years in the previous decade have had monsoons lasting until the middle of autumn, which is definitely a change," said a high-ranking meteorology expert.

Increasing Weather Extremes

More worrying is the heavy precipitation and snow the concluding phase of the season produces, like it did recently on early October.

High in the mountain range, such extreme conditions means blizzards and winter storms, which represents a significant risk for trekking, mountaineering and the travel industry.

Firsthand Experiences

That's what happened recently when the weather changed very abruptly - the winds began howling, temperatures dropped sharply and sightlines dropped significantly.

The path that had comfortably led the trekkers to what was expected to be a breathtaking resting point was now covered in snow and extremely difficult to navigate.

Nevertheless, one trekker, who had climbed the Himalayas more than a dozen times, said he had "never encountered weather like these" before.

Expert Explanations

A primary big factor is the higher amount of moisture in the air because of how the world has been warming, scientists explain.

That has led to heavy precipitation over a brief period of time, often after a extended dry spell – unlike in the previous era when seasonal rains were distributed uniformly over four months.

A Intensified Monsoon

Weather experts say the monsoons in the region at occasions seem to have become stronger because they are increasingly coming into contact with an additional atmospheric phenomenon, the westerly disturbance.

This is a low pressure system that originates in the Mediterranean area and moves eastward - it carries chillier temperatures that causes rains and occasionally snowfall to northern India, neighboring countries and Nepal.

Climate Change Impacts

Researchers have also found that in a heating planet, the increasing interaction between westerly disturbances and monsoons is causing an additional unusual result.

The warmer atmosphere is pushing the weather systems to greater altitudes, which means these atmospheric conditions are now able to cross the Himalayas and affect the Tibetan plateau and other areas that previously experienced less as much precipitation before.

"The transformation is the predictability of patterns; we cannot presume that conditions will occur the identical from season to season," said an seasoned mountain leader.

"That means adaptable planning, real-time decision-making, and knowledgeable guidance [in the Himalayas] have become even more important."