When the sun rays fall direct along the Tropic of Cancer the Northern Hemisphere especially India becomes very hot and due to intense heat the low pressure area is formed around Multan in Pakistan and at the same time high pressure areas are formed in the Indian Ocean, Australia and in the South of Japan in the Pacific Ocean. The winds laden with moisture start blowing from high pressure areas to the low-pressure areas. These south-western winds as coming from the south of the Indian Ocean towards India, are full of vapours, they shed rainfall in India due to obstruction of the Himalayas. These summer monsoons are also called south-west monsoons.
