a storm or a whiteout, which can cause trekkers to become disoriented and lost. Trekkers usually depart Thorung Pedi / Thorung High camp a few hours before sunrise, as strong winds typically begin a few hours after sunrise. Local climate The local climate on the western side of the pass is much drier than on the eastern side. There is practically no vegetation on the western side, except where irrigated, while in the Manang valley there is much more vegetation and cultivation is possible, while it is still fairly dry, as the valley is protected from the wet southern monsoon winds by the Annapurna mountain range. 2014 disaster After a heavy blizzard from Cyclone Hudhud about forty people, including trekkers, guides and locals, were killed arround Thorong La. Hampered by 1.8 meters of snow within twelve hours and disruption of cell service in the Manang District, local forces were able to rescue ca. 300 people by helicopter. References Stan Armington, "Trekking in the Nepal Himalaya". Lonely Planet, 2001. Mountain passes of Nepal Mountain passes of the Himalayas Hiking trails in Nepal