Guwahati : The India Meteorological Department has forecast a prolonged spell of heavy to very heavy rainfall across Assam over the next several days, issuing warnings for thunderstorms, lightning and gusty winds in multiple districts till May 21.

According to the latest IMD bulletin, south Assam is expected to receive very heavy rainfall on Friday, while widespread heavy rainfall activity is likely to continue across Assam and Meghalaya throughout the May 15-21 period.

The weather department warned that thunderstorms accompanied by lightning and strong winds with speeds reaching 40-50 kmph could affect several parts of the Northeast during the forecast period. “The heavy rainfall may lead to waterlogging in low-lying areas, traffic disruptions and localised landslides in vulnerable hilly regions,” the IMD said in its advisory.

Residents have been advised to remain alert, monitor official weather updates and follow safety advisories issued by local authorities. The IMD also cautioned that strong winds and lightning may damage weak structures, standing crops, trees and electricity infrastructure.

“People are advised to stay indoors during thunderstorms, avoid taking shelter under trees and unplug electrical appliances during lightning activity,” the advisory stated. The department further warned that kutcha houses and temporary structures in vulnerable areas could suffer partial damage due to intense rainfall and gusty winds.

During the past 24 hours, several areas across Assam and Meghalaya recorded significant rainfall activity, while gusty winds were reported in Guwahati and adjoining regions. Wind speeds in Guwahati touched 46 kmph, while places such as Manas and Shillong also experienced strong wind conditions.

Officials said district administrations are closely monitoring the evolving weather situation, especially in flood-prone and landslide-prone districts. The IMD has advised commuters to avoid unnecessary travel during periods of heavy rain and thunderstorms, warning that waterlogging and poor visibility could disrupt road traffic in urban centres.

Apart from Assam and Meghalaya, heavy rainfall warnings have also been issued for Arunachal Pradesh between May 15 and 17, and again on May 20 and 21. Nagaland, Manipur and Mizoram are also expected to witness spells of heavy rainfall during the forecast period.

Across the wider Northeast region, weather conditions are likely to remain unstable through the coming week as pre-monsoon activity intensifies, bringing widespread rain, thunderstorms and gusty winds.