The low-pressure area in India lies in the northwest, towards which the South West Monsoon winds are attracted. After depositing moisture in south India, the Bay of Bengal branch of the South West Monsoons strikes the Khasi - Garo Hills. After causing heavy rainfall on the windward slopes, these winds turn westwards because of the presence of the lofty Himalayas. These winds then keep depositing rainfall they go up the Ganga valley towards the low-pressure area. The rainfall deposited thus keeps on decreasing as the winds proceed from east to west in Northern India, as this is the last region to be affected by the monsoons.