Sri Lanka: Adverse weather forecast nationwide through at least Jan. 10

Severe weather is forecast across Sri Lanka through at least Jan. 10. A weather system passing south of the island is expected to bring heavy downpours over the coming days. The Sri Lankan Department of Meteorology issued an amber advisory (the middle level on a three-tier scale) for heavy rainfall Jan. 9-10. The advisory warns of a high risk of heavy rainfall over much of the country's eastern half and a moderate risk of heavy rainfall over the rest of Sri Lanka. Rainfall totals of more than 10 cm (4 inches) are forecast across parts of Central, Eastern, and Uva provinces and Hambantota, Mullaitivu, and Polonnaruwa districts. Strong winds and thunderstorms may accompany the heavy downpours. The department has advised the public to take necessary precautions to minimize the potential for damage caused by the adverse weather. Officials could update and possibly extend the coverage of weather alerts over the coming days.

The heavy downpours could trigger flooding in low-lying areas and landslides on unstable slopes. The Sri Lanka Disaster Management Center has issued yellow early warnings (the lowest level on a three-tier scale) for landslides in parts of Badulla, Galle, Kandy, Matara, Monaragala, Nuwara Eliya, and Ratnapura districts.

Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites located downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rainfall has saturated the soil.

Authorities could issue mandatory evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are possible where significant flooding or landslides impact utility networks.

The severe weather will likely contribute to transport disruptions throughout the country. Traffic and commercial trucking delays might occur along regional highways. Flooding downpours could inundate some low-lying roads in areas with poor drainage. Strong winds might also pose a hazard to high-profile vehicles. Hazardous weather conditions might cause flight delays and cancellations at regional airports.