Sri Lanka: Adverse weather forecast across much of the country through at least Nov. 30

Severe weather is forecast across much of Sri Lanka through at least Nov. 30. A potential deep depression over the southwestern Bay of Bengal has brought heavy rainfall to the country over the recent days resulting in widespread flooding.

The Sri Lankan Department of Meteorology has issued a red warning (the highest level on a three-tier scale) for the system, warning that very heavy showers of more than 15 cm (6 inches) and strong gusty winds are likely in the Northern Province as well as Trincomalee District. Rainfall of more than 10 cm (4 inches) is forecast in North Central and North Western provinces as well as Matale and Kegalle districts. Lesser rainfall amounts are likely across the rest of Sri Lanka. Authorities will likely issue new alerts or update/rescind existing advisories as weather conditions change over the coming days.

Flooding has impacted hundreds of thousands of people. Authorities have confirmed at least four fatalities due to floodwaters, with at least nine other injuries and six people missing. Flooding has damaged over 800 homes. Emergency crews have evacuated over 15,000 people. Train services are suspended in some mountainous regions. Several major roads, including parts of the A9 Highway are closed.

Thunderstorms will be capable of producing strong winds, heavy rainfall, and lightning. 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 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, strong winds, 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.