How the Fall Climbing Season Became Fatal in the Himalayan Mountains
Bright skies, gentle winds and a breathtaking view of Himalayan summits draped in snow - this describes the fall setting that hikers on the world's highest peak have grown to adore.
However this seems to be shifting.
Shifting Weather Patterns
Meteorologists say the monsoon now stretches into fall, which is traditionally the mountain travel season.
Throughout this delayed tail end of monsoon, they have recorded at least one occurrence of extreme rainfall almost every year for the past decade, with mountain weather becoming increasingly hazardous.
Latest Crisis on Everest
Recently, a unexpected blizzard stranded hundreds of tourists near the east-facing face of Everest for multiple days in bitterly cold conditions at an altitude of more than 4,900m.
Nearly six hundred trekkers were guided to security by the end of Tuesday, according to sources.
One person had succumbed from extreme cold and mountain sickness, but the remaining individuals were said to be in good condition.
Similar Incidents Across the Region
This was on the Tibetan side but something similar had developed on the Nepal slope, where a Korean climber lost his life on Mera Peak.
The international community learned much later because communication lines were disrupted by heavy downpours and significant snow accumulation.
Officials estimate that landslides and sudden floods in the region have claimed the lives of around sixty individuals over the past seven days.
"This is very unusual for autumn during which we anticipate the weather to stay calm," said Riten Jangbu Sherpa.
Business Consequences
Given this is the favored season, regular extreme weather events like these have "affected our mountaineering and climbing industry," he continued.
The monsoon season in the Indian subcontinent and the Himalayan nation usually continues from early summer to early autumn, but no longer.
"Our data shows that most of the years in the past ten years have had rainy seasons lasting until the middle of autumn, which is certainly a shift," explained a high-ranking weather official.
Growing Climate Extremes
Even more worrying is the intense precipitation and snow the concluding phase of the season produces, like it did recently on 4 and 5 October.
High in the Himalayas, such extreme conditions means blizzards and winter storms, which constitutes a huge risk for trekking, mountaineering and tourism.
Firsthand Experiences
That's what occurred last weekend when the conditions shifted very suddenly - the air currents began roaring, mercury readings plummeted and sightlines dropped drastically.
The trail that had comfortably led the hikers to what was expected to be a stunning pitstop was now buried in white accumulation and extremely difficult to navigate.
Still, one hiker, who had climbed these mountains more than a twelve occasions, said he had "not once experienced conditions like these" before.
Expert Explanations
A primary big factor is the increased quantity of humidity in the atmosphere because of how the world has been warming, scientists explain.
That has contributed to torrential rains over a short span of duration, often after a extended dry spell – unlike in the previous era when seasonal rains were distributed evenly over four months.
A Intensified Monsoon
Weather specialists report the monsoons in the region at occasions seem to have become stronger because they are increasingly interacting with an additional weather system, the western weather pattern.
The phenomenon is a low pressure system that forms in the Mediterranean region and travels east - it carries cold air that causes rains and occasionally snow to the subcontinent, Pakistan and Nepal.
Climate Change Impacts
Scientists have additionally found that in a heating planet, the increasing interaction between westerly disturbances and seasonal rains is producing an additional atypical outcome.
The hotter air is forcing the weather systems higher, which means these atmospheric conditions are now capable to pass over the Himalayas and reach the Tibetan plateau and other regions that previously experienced less as much rain in the past.
"The transformation is the predictability of patterns; we cannot presume that situations will occur the identical from season to season," said an experienced mountain leader.
"This implies flexible scheduling, real-time decision-making, and knowledgeable leadership [in the Himalayas] have become even more crucial."
