Why the Fall Trekking Period Became Deadly in the Himalayas
Clear heavens, calm breezes and a breathtaking vista of Himalayan peaks draped in white powder - this describes the autumn setting that hikers on Mount Everest have grown to adore.
But that seems to be changing.
Changing Weather Patterns
Climate scientists say the monsoon now extends into fall, which is traditionally the mountain tourism period.
During this prolonged conclusion of the rainy season, they have documented at least one episode of heavy precipitation nearly every year for the past ten years, with mountain weather becoming increasingly hazardous.
Recent Crisis on Everest
Recently, a shock snowstorm trapped several hundred of travelers near the east-facing face of Everest for days in bitterly cold temperatures at an elevation of more than 16,000ft.
Approximately 600 hikers were led to safety by the conclusion of Tuesday, according to sources.
One individual had succumbed from extreme cold and altitude sickness, but the remaining individuals were said to be in stable condition.
Comparable Incidents Across the Region
This was on the northern side but a comparable situation had unfolded on the southern side, where a Korean mountaineer lost his life on Mera Peak.
The international community found out after some delay because communications were affected by heavy downpours and heavy snowfall.
Officials calculate that mudslides and flash floods in the region have killed around sixty individuals over the past seven days.
"It is highly unusual for October when we expect the skies to stay calm," said an experienced mountain guide.
Business Impact
Given this is the favored period, frequent extreme weather events like these have "disrupted our trekking and climbing business," he continued.
The rainy period in northern India and Nepal typically continues from June to mid-September, but no longer.
"Research demonstrates that the majority of the years in the past decade have had monsoons lasting until the second week of autumn, which is certainly a shift," said a high-ranking weather official.
Growing Climate Extremes
More concerning is the heavy precipitation and snowfall the tail end of the season brings, like it occurred this time on early October.
High in the mountain range, such severe weather translates to snowstorms and snowstorms, which constitutes a huge danger for hiking, mountaineering and tourism.
Personal Experiences
Exactly what occurred recently when the conditions changed quite suddenly - the air currents began roaring, mercury readings plummeted and visibility dropped drastically.
The road that had easily led the hikers to what should have been a breathtaking pitstop was now buried in white accumulation and impossible to traverse.
Nevertheless, one trekker, who had climbed the Himalayas more than a dozen times, said he had "not once experienced conditions like this" before.
Expert Explanations
A primary major factor is the higher amount of moisture in the atmosphere because of how the world has been warming, scientists say.
That has led to torrential rains over a brief period of time, frequently after a prolonged dry spell – in contrast to in the previous era when seasonal rains were distributed evenly over four months.
A Turbocharged Monsoon
Weather specialists say the rainy seasons in the region at times seem to have become more intense because they are more frequently interacting with another atmospheric phenomenon, the westerly disturbance.
The phenomenon is a atmospheric depression that forms in the Mediterranean area and travels eastward - it carries cold air that brings precipitation and occasionally snowfall to the subcontinent, Pakistan and Nepal.
Global Warming Effects
Researchers have additionally discovered that in a warming planet, the increasing relationship between westerly disturbances and seasonal rains is causing an additional atypical result.
The hotter atmosphere is pushing the weather systems to greater altitudes, which means these atmospheric conditions are now capable to cross the Himalayas and reach Tibet and additional regions that previously experienced less as much rain in the past.
"What's changed is the reliability of patterns; we can't assume that situations will behave the identical from year to year," said an experienced expedition guide.
"That means adaptable planning, immediate decision-making, and experienced guidance [in the Himalayas] have become increasingly important."