CNN: As snow layered the trail before him, Hari Chaudhary thought it was odd. The veteran trekking guide had never seen snow on the trail in early October. The popular 21-day Annapurna Circuit takes trekkers in a horseshoe-shaped route around a majestic segment of the Himalayas in Nepal. On the 10th day of the tour, Chaudhary and his clients, two young Israeli women, were descending from the highest point of the trail, Thorung La Pass, to the next destination, a walk that would normally take about seven...