Why the Autumn Trekking Period Became Lethal in the Himalayas
Bright heavens, calm winds and a breathtaking view of majestic summits covered in snow - this describes the autumn experience that hikers on the world's highest peak have grown to adore.
But this seems to be shifting.
Shifting Weather Patterns
Climate scientists indicate the monsoon now stretches into fall, which is traditionally the high-altitude tourism season.
During this prolonged tail end of the rainy season, they have documented at least one episode of extreme precipitation almost every year for the previous decade, with high-altitude conditions becoming more risky.
Latest Emergency on Everest
Recently, a unexpected snowstorm trapped several hundred of visitors near the eastern face of Everest for days in bitterly cold conditions at an altitude of more than 4,900m.
Approximately six hundred hikers were escorted to safety by the conclusion of Tuesday, according to sources.
A single person had died from hypothermia and altitude sickness, but the remaining individuals were reportedly in good health.
Similar Events Across the Region
The emergency was on the northern slope but something similar had developed on the southern side, where a Korean climber died on another Himalayan summit.
The international community found out after some delay because communication lines were hit by torrential rains and heavy snowfall.
Authorities calculate that mudslides and sudden floods in the country have killed around sixty individuals over the previous week.
"It is highly unusual for autumn when we expect the weather to stay clear," stated Riten Jangbu Sherpa.
Economic Consequences
Considering autumn represents the preferred season, regular storms like these have "hampered our mountaineering and mountaineering industry," he added.
The monsoon season in the Indian subcontinent and the Himalayan nation typically lasts from June to mid-September, but no longer.
"Research indicates that the majority of the annual cycles in the past ten years have had rainy seasons continuing until the middle of October, which is certainly a shift," said a high-ranking meteorology official.
Growing Weather Severity
More worrying is the heavy precipitation and snow the tail end of the season brings, like it occurred recently on 4 and 5 October.
High in the mountain range, such severe conditions translates to blizzards and winter storms, which constitutes a huge danger for hiking, mountaineering and the travel industry.
Personal Accounts
That's what happened last weekend when the conditions changed quite abruptly - the winds began howling, temperatures plummeted and visibility decreased drastically.
The path that had comfortably led the hikers to what was expected to be a breathtaking pitstop was now buried in white accumulation and impossible to traverse.
Still, one trekker, who had hiked these mountains more than a dozen occasions, said he had "not once experienced conditions like this" before.
Scientific Analysis
A primary major factor is the increased quantity of moisture in the atmosphere because of how the planet has been warming, researchers say.
This has led to torrential rains over a brief period of duration, often after a extended period without rain – unlike in the past when seasonal rains were distributed uniformly over the entire season.
A Intensified Monsoon
Weather specialists say the monsoons in the region at occasions appear to have become stronger because they are more frequently coming into contact with an additional atmospheric phenomenon, the western weather pattern.
The phenomenon is a atmospheric depression that forms in the Mediterranean area and moves eastward - it transports chillier temperatures that causes precipitation and occasionally snow to northern India, Pakistan and Nepal.
Global Warming Effects
Researchers have additionally found that in a heating planet, the increasing interaction between westerly disturbances and monsoons is causing another atypical result.
The hotter atmosphere is pushing the clouds higher, which indicates these atmospheric conditions are now capable to pass over the Himalayas and reach the Tibetan plateau and other regions that did not see so much rain in the past.
"What's changed is the reliability of weather patterns; we cannot presume that situations will behave the same from season to season," commented an experienced mountain leader.
"That means adaptable planning, real-time decision-making, and experienced leadership [in the Himalayas] have become increasingly important."
