Extreme rainfall

Heavy and persistent rains lashed several parts of Sri Lanka yesterday, triggering flooding, transport disruptions, flight diversions and multiple disaster warnings as water levels rose in key river basins and low-lying urban areas.
The worst affected situation was reported along the Colombo–Avissawella main road, where floodwaters submerged sections of the highway, bringing vehicular movement to a standstill at several points, including the Puwakpitiya-Thummodara junction, the Seethawaka Botanical Garden area, and parts of Yatiyantota. Traffic was also severely disrupted along the Delgoda–Belumahara road at Udupila, and the Gampaha–Miriswatta road, due to inundation, while movement on the Divulapitiya–Mirigama route was restricted for light vehicles, following flooding at Ullalapitiya.
In the Kelani River Valley, rising water levels, following heavy rainfall in the catchment areas, prompted warnings of possible minor flooding within the next 48 hours. The Irrigation Department cautioned that areas, including Hanwella, Seethawaka, Dompe, Padukka, Homagama, Biyagama, Kaduwela, Kolonnawa, Kelaniya, Wattala and Colombo, could be affected. The flood alert, issued at 10:00 am yesterday, remains valid for 48 hours, until Sunday morning.
Meanwhile, the National Building Research Organisation (NBRO) issued landslide warnings covering six districts—Colombo, Gampaha, Kalutara, Kegalle, Nuwara Eliya and Ratnapura. Red alerts were issued for Dehiowita, in Kegalle and Ratnapura, while amber and yellow warnings were declared for several vulnerable divisions, including Seethawaka, Padukka, Attanagalla, Ingiriya, Bulathsinhala, Ruwanwella, Kuruwita, Ayagama, Pelmadulla, Yatiyantota, Ambagamuwa, Eheliyagoda, Nivithigala and Kalawana.
In the civil aviation sector, poor visibility and heavy rain around Katunayake forced the diversion of around six inbound flights, bound for Bandaranaike International Airport (BIA), to Mattala Rajapaksa International Airport, as a precautionary measure.
The Department of Meteorology reported that the highest rainfall recorded was 336.5 mm in Pambegama, Kegalle, between Thursday morning and Friday morning, underscoring the intensity of the ongoing weather system.
Authorities have urged the public, in affected districts, to remain vigilant, avoid flood-prone roads, and adhere to disaster warnings as adverse weather conditions are expected to persist.
by Norman Palihawadane and Chaminda Silva