Weather tomorrow: IMD warns of heavy rain in Northeast, Karnataka, Tamil Nadu; thunderstorms likely. Heavy rain and thunderstorms are forecasted for isolated areas in the Northeast and South of India. The India Meteorological Department has issued warnings for Assam, Meghalaya, and Tamil Nadu. Thunderstorms accompanied by lightning and gusty winds are expected to impact several regions across the country. Central and western India will also experience varying rainfall until October 3.