New Delhi, June 9 -- The Southwest monsoon's advance on Monday covered more parts of west- central and east- central Arabian Sea, Maharashtra, Karnataka, Andhra Pradesh, and Telangana, India Meteorological Department (IMD) officials said. Monsoon began on June 4, three days after its normal onset date and five days after IMD's forecast date. IMD forecast that isolated heavy to very heavy rainfall (7-20cm) was very likely over Kerala, Karnataka, Tamil Nadu and northeast India, Sub-Himalayan West Bengal over seven days from Monday, with isolated extremely heavy rainfall over Karnataka & Kerala likely on Tuesday. "Monsoon is showing good progress for now. It will cover all of NW India, Sub Himalayan West Bengal, parts of central India, east Bihar and parts of Jharkhand over next 2-3 days. We can also expect monsoon will reach south Gujarat by June 16-17. In the meantime, pre-monsoon activity will increase over west and northwest India during next few days," said Mahesh Palawat, vice president, climate and meteorology at Skymet Weather. "Conditions are favourable for further advance of southwest monsoon into some more parts of central Arabian Sea, Maharashtra, Karnataka, Telangana, Andhra Pradesh, remaining parts of Tamil Nadu & southwest Bay of Bengal, some more parts of westcentral & northwest Bay of Bengal, some parts of Chhattisgarh, Odisha, West Bengal & Sikkim, remaining parts of Northeastern states during next 2-3 days," the meteorological agency said on Monday....