New Delhi, July 13 -- The monsoon rains are set to weaken across the northwest, west-central and southern regions of the country over the next week, even as authorities warn of extreme rainfall in the northeast and east that could trigger flash floods.

Northwest India comprises the Western Himalayan region, Punjab, Haryana, Delhi, Uttar Pradesh and Rajasthan, while central India includes Madhya Pradesh, Vidarbha and Chhattisgarh. The southern peninsula covers Andhra Pradesh, Telangana, Karnataka, Kerala, Tamil Nadu, Puducherry and Lakshadweep.

According to IMD, in the northwest region, Himachal Pradesh, Delhi, Haryana, Punjab, Chandigarh, Rajasthan, eastern Uttar Pradesh, and western Uttar Pradesh are likely to receive isolated to scatt...