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Clear skies, gentle winds and a breathtaking vista of majestic summits covered in white powder - that is the fall setting that trekkers on the world's highest peak have grown to adore.

However that seems to be transforming.

Changing Climate Conditions

Climate scientists indicate the monsoon now stretches into fall, which is traditionally the mountain tourism season.

Throughout this delayed tail end of the rainy season, they have documented at least one instance of heavy precipitation almost every year for the previous ten years, with high-altitude conditions becoming more dangerous.

Recent Crisis on Everest

Recently, a unexpected blizzard stranded hundreds of tourists near the eastern face of Mount Everest for multiple days in freezing conditions at an elevation of more than 4,900m.

Almost six hundred hikers were escorted to security by the end of that week, according to reports.

A single individual had died from hypothermia and altitude sickness, but the remaining individuals were said to be in good health.

Comparable Events Across the Region

This was on the northern side but a comparable situation had developed on the Nepal side, where a Korean mountaineer lost his life on another Himalayan summit.

The international community found out much later because communication lines were affected by torrential rains and heavy snowfall.

Authorities estimate that landslides and sudden floods in the country have claimed the lives of around sixty people over the past week.

"It is very atypical for autumn when we expect the weather to remain clear," stated an experienced mountain guide.

Business Consequences

Given this is the preferred period, regular extreme weather events like these have "disrupted our trekking and mountaineering business," he added.

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

"Our data shows that most of the years in the past decade have had rainy seasons continuing until the middle of October, which is definitely a shift," explained a senior meteorology official.

Increasing Weather Extremes

More concerning is the intense precipitation and snowfall the tail end of the period brings, like it did this time on early October.

High in the mountain range, such extreme weather means snowstorms and winter storms, which constitutes a significant danger for hiking, mountaineering and the travel industry.

Personal Accounts

That's what happened recently when the weather changed quite abruptly - the air currents began howling, mercury readings dropped sharply and visibility decreased significantly.

The road that had comfortably brought the hikers to what should have been a breathtaking resting point was now buried in snow and impossible to traverse.

Still, one hiker, who had hiked the Himalayas more than a dozen times, said he had "never encountered weather like this" before.

Scientific Analysis

A primary major factor is the higher quantity of humidity in the atmosphere because of how the planet has been heating up, researchers explain.

This has led to torrential rains over a short span of time, frequently after a prolonged period without rain – unlike in the past when monsoon showers were spread uniformly over the entire season.

A Intensified Monsoon

Climate experts report the rainy seasons in the region at times appear to have become more intense because they are increasingly interacting with an additional atmospheric phenomenon, the westerly disturbance.

This is a low pressure system that originates in the Mediterranean area and travels east - it transports cold air that brings rains and occasionally snowfall to northern India, neighboring countries and Nepal.

Climate Warming Impacts

Scientists have also found that in a heating planet, the increasing relationship between westerly disturbances and seasonal rains is causing another unusual outcome.

The warmer atmosphere is forcing the weather systems to greater altitudes, which indicates these weather systems are now able to cross the mountain barrier and affect the Tibetan plateau and other regions that did not see as much precipitation in the past.

"What's changed is the reliability of weather patterns; we cannot presume that conditions will behave the identical from year to year," commented an seasoned expedition leader.

"That means flexible scheduling, real-time choices, and experienced guidance [in the Himalayas] have become increasingly essential."