1. Because of its location and stupendous height, the Great Himalaya Range obstructs the passage of the southwesterly monsoon winds and forces them to give up most of their moisture to its south on the Indian side. As a result, the Himalayan region on the Indian side receives heavy precipitation (rain).
2. Tibet lies in the rain shadow region of these winds, so it gets scanty rainfall and hence the condition is arid in Tibet.
