How the Autumn Climbing Season Became Lethal in the Himalayas

Bright skies, calm breezes and a breathtaking view of Himalayan peaks covered in snow - that is the autumn setting that trekkers on the world's highest peak have grown to adore.

However that appears to be transforming.

Shifting Climate Conditions

Meteorologists report the monsoon now extends into fall, which is historically the mountain travel season.

During this delayed conclusion of monsoon, they have documented at least one instance of extreme precipitation nearly every year for the past ten years, with mountain weather becoming more risky.

Recent Crisis on Everest

Last weekend, a sudden snowstorm stranded hundreds of tourists near the east-facing face of Mount Everest for multiple days in bitterly cold temperatures at an elevation of more than 16,000ft.

Approximately 600 trekkers were guided to security by the end of that week, according to sources.

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

Comparable Events Across the Region

The emergency was on the Tibetan slope but a comparable situation had occurred on the Nepal side, where a South Korean climber died on Mera Peak.

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

Authorities estimate that landslides and sudden floods in the region have claimed the lives of around sixty individuals over the previous week.

"It is very unusual for October when we expect the skies to remain clear," said an experienced mountain guide.

Economic Impact

Considering autumn represents the preferred period, regular extreme weather events like this have "disrupted our mountaineering and mountaineering industry," he continued.

The rainy period in northern India and Nepal usually continues from early summer to mid-September, but not anymore.

"Research demonstrates that most of the annual cycles in the previous decade have had rainy seasons continuing until the middle of October, which is certainly a shift," said a senior meteorology expert.

Growing Weather Extremes

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

High in the Himalayas, such extreme weather translates to snowstorms and snowstorms, which represents a huge risk for trekking, climbing and tourism.

Firsthand Accounts

Exactly what happened last weekend when the conditions changed very suddenly - the winds began howling, mercury readings plummeted and visibility dropped drastically.

The trail that had comfortably led the trekkers to what should have been a stunning resting point was now buried in snow and impossible to traverse.

Still, one hiker, who had climbed the Himalayas more than a twelve times, reported he had "never experienced conditions like these" before.

Expert Analysis

A primary major driver is the increased quantity of humidity in the air because of how the world has been heating up, scientists say.

This has led to torrential rains over a short span of duration, frequently after a extended dry spell – unlike in the previous era when monsoon showers were spread evenly over the entire season.

A Turbocharged Monsoon

Weather experts report the rainy seasons in the region at times appear to have become more intense because they are more frequently interacting with an additional weather system, the western weather pattern.

The phenomenon is a atmospheric depression that originates in the Mediterranean area and travels east - it transports cold air that causes precipitation and sometimes snowfall to the subcontinent, neighboring countries and the Himalayan region.

Climate Warming Effects

Researchers have additionally discovered that in a warming planet, the growing interaction between westerly disturbances and seasonal rains is causing another unusual result.

The warmer air is forcing the weather systems to greater altitudes, which means these weather systems are now able to pass over the Himalayas and reach Tibet and other regions that previously experienced less as much rain in the past.

"The transformation is the reliability of patterns; we can't assume that conditions will occur the identical from year to year," said an experienced expedition leader.

"That means flexible planning, real-time choices, and experienced leadership [in the Himalayas] have become even more essential."