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Bright heavens, calm winds and a breathtaking view of Himalayan summits covered in snow - that is the autumn setting that hikers on Mount Everest have grown to adore.

But that seems to be shifting.

Changing Weather Patterns

Weather experts say the rainy season now extends into fall, which is historically the mountain tourism period.

Throughout this delayed tail end of the rainy season, they have recorded at least one episode of extreme precipitation nearly every year for the previous ten years, with mountain conditions becoming more hazardous.

Latest Crisis on Everest

Recently, a sudden snowstorm stranded several hundred of visitors near the eastern side of Mount Everest for multiple days in freezing conditions at an altitude of more than 4,900m.

Almost six hundred hikers were led to security by the conclusion of Tuesday, according to sources.

One person had died from hypothermia and mountain sickness, but the others were reportedly in good condition.

Similar Events Across the Region

This was on the Tibetan side but something similar had developed on the southern side, where a Korean climber died on Mera Peak.

The world found out much later because communication lines were hit by torrential rains and significant snow accumulation.

Authorities calculate that mudslides and flash floods in the country have killed approximately 60 people over the previous seven days.

"This is very unusual for autumn during which we anticipate the weather to stay clear," said Riten Jangbu Sherpa.

Economic Impact

Given this is the preferred season, frequent storms like these have "hampered our trekking and climbing industry," he continued.

The monsoon season in northern India and Nepal typically lasts from June to early autumn, but not anymore.

"Research demonstrates that the majority of the years in the previous decade have had monsoons lasting until the middle of October, which is definitely a change," said a high-ranking weather official.

Growing Climate Severity

More worrying is the heavy precipitation and snowfall the concluding phase of the period produces, like it occurred recently on 4 and 5 October.

High in the mountain range, such extreme weather means snowstorms and winter storms, which represents a significant risk for hiking, climbing and tourism.

Firsthand Experiences

That's what occurred last weekend when the weather shifted quite suddenly - the air currents began howling, mercury readings plummeted and visibility decreased drastically.

The path that had comfortably led the hikers to what was expected to be a stunning pitstop was now covered in white accumulation and extremely difficult to traverse.

Nevertheless, one trekker, who had climbed these mountains more than a twelve times, reported he had "not once encountered weather like this" before.

Scientific Analysis

A primary big driver is the increased quantity of humidity in the air because of how the world has been warming, researchers say.

This has contributed to torrential rains over a short span of time, frequently after a prolonged period without rain – in contrast to in the previous era when monsoon showers were distributed uniformly over the entire season.

A Intensified Monsoon

Climate experts say the rainy seasons in the region at occasions seem to have become stronger because they are increasingly interacting with another weather system, the westerly disturbance.

This is a low pressure system that forms in the Mediterranean region and moves eastward - it carries cold air that brings rains and occasionally snow to the subcontinent, Pakistan and Nepal.

Climate Warming Effects

Researchers have additionally discovered that in a heating world, the growing interaction between westerly disturbances and monsoons is producing another atypical result.

The hotter atmosphere is forcing the clouds to greater altitudes, which indicates these atmospheric conditions are now able to cross the mountain barrier and affect the Tibetan plateau and other areas that did not see so much rain in the past.

"The transformation is the reliability of patterns; we cannot presume that situations will occur the same from season to season," said an seasoned expedition leader.

"This implies adaptable planning, real-time decision-making, and experienced leadership [in the Himalayas] have become increasingly important."