The Department of Meteorology has issued heavy rain and severe lightning advisories for several provinces, warning of rainfall of 100 mm to 150 mm in some areas.
The department said a low-level atmospheric disturbance in the Bay of Bengal near Sri Lanka is bringing showers and thundershowers to most parts of the island.
The heavy rain advisory covers the Western, Sabaragamuwa, Central, Uva and Southern provinces. It is valid from 6.30 pm on Tuesday until 6.30 pm on Wednesday.
A separate lightning advisory covers the same provinces and the North-western Province, and remains valid until 1.00 am on Wednesday. Temporarily strong winds are also possible in some places.
The department urged the public to stay indoors during thunderstorms, avoid open fields and water bodies, and watch for fallen trees and power lines.
Residents in the affected provinces should follow updated advisories from the department.
