How the Autumn Trekking Period Turned Fatal in the Himalayan Mountains

Clear skies, calm winds and a breathtaking vista of Himalayan summits draped in white powder - this describes the autumn experience that trekkers on the world's highest peak have grown to adore.

But this seems to be transforming.

Shifting Climate Conditions

Weather experts report the monsoon now stretches into fall, which is traditionally the mountain tourism season.

During this delayed conclusion of the rainy season, they have recorded at least one instance of heavy rainfall almost every year for the past decade, with high-altitude conditions becoming increasingly hazardous.

Latest Emergency on Everest

Last weekend, a sudden snowstorm stranded hundreds of visitors near the eastern face of Everest for days in bitterly cold temperatures at an altitude of more than 4,900m.

Almost 600 trekkers were led to safety by the conclusion of Tuesday, according to sources.

A single person had died from hypothermia and altitude sickness, but the others were said to be in good condition.

Similar Incidents Across the Region

The emergency was on the Tibetan side but something similar had developed on the southern slope, where a Korean mountaineer died on Mera Peak.

The world found out much later because communications were hit by torrential rains and heavy snowfall.

Authorities estimate that landslides and flash floods in the region have claimed the lives of around 60 individuals over the past seven days.

"It is very atypical for October when we expect the weather to stay calm," said Riten Jangbu Sherpa.

Business Consequences

Considering autumn represents the favored season, regular storms like these have "hampered our mountaineering and climbing industry," he added.

The monsoon season in northern India and the Himalayan nation usually continues from June to mid-September, but not anymore.

"Our data shows that the majority of the years in the past ten years have had rainy seasons continuing until the second week of October, which is definitely a change," said a high-ranking meteorology official.

Increasing Climate Severity

More worrying is the heavy rain and snowfall the concluding phase of the season brings, like it occurred this time on 4 and 5 October.

High in the mountain range, such severe conditions means blizzards and snowstorms, which represents a huge danger for trekking, mountaineering and the travel industry.

Firsthand Experiences

Exactly what happened last weekend when the weather changed very suddenly - the winds began howling, temperatures dropped sharply and visibility dropped drastically.

The path that had easily brought the trekkers to what was expected to be a stunning resting point was now covered in white accumulation and impossible to navigate.

Still, one hiker, who had hiked the Himalayas more than a dozen times, reported he had "not once experienced conditions like this" before.

Expert Explanations

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

That has contributed to torrential rains over a brief period of time, often after a prolonged period without rain – in contrast to in the past when monsoon showers were spread evenly over four months.

A Intensified Monsoon

Weather experts report the rainy seasons in South Asia at times seem to have become more intense because they are increasingly coming into contact with another weather system, the western weather pattern.

The phenomenon is a low pressure system that originates in the Mediterranean region and travels east - it transports cold air that causes precipitation and sometimes snowfall to northern India, neighboring countries and the Himalayan region.

Global Change Impacts

Scientists have also discovered that in a heating world, the increasing relationship between western weather systems and monsoons is causing another unusual outcome.

The warmer air is pushing the weather systems to greater altitudes, which means these atmospheric conditions are now able to pass over the mountain barrier and reach the Tibetan plateau and additional regions that previously experienced less as much rain before.

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

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