Heavy to very heavy rainfall is very likely to occur at isolated places over Arunachal Pradesh, Assam and Meghalaya on Monday, India Meteorological Department (IMD) predicted.

The IMD also predicted heavy rainfall at isolated places over Sikkim, Nagaland, Manipur, Mizoram and Tripura for Monday.

Thunderstorm, accompanied with lightning, is very likely at isolated places over Sikkim Arunachal Pradesh, Assam, Meghalaya, Nagaland, Manipur, Mizoram, Tripura, the IMD said in a release.

Warning of an increase in rainfall activity over Western Himalayan Region and adjoining plains of northwest India from Monday, the IMD said.