Sri Lanka: Adverse weather forecast across much of the country through at least April 18

Severe weather is forecast across much of Sri Lanka through at least April 18. Showers and thunderstorms are expected across much of the country April 15, with the most intense storms likely in southwestern and western regions and the heaviest rainfall likely in southern and southeastern regions. The Sri Lankan Department of Meteorology has issued a warning for severe lightning through late April 15, with a high risk of severe storms likely over North-Western, Sabaragamuwa, and Western provinces and Galle, Kandy, Matara, and Nuwara-Eliya districts. There is a moderate risk of severe lightning across the rest of Sri Lanka. An advisory for heavy rain has been issued for Uva Province and Ampara, Batticaloa, Hambantota, and Matara districts; rainfall totals of over 10 cm (4 inches) are expected in these areas. Further showers and storms are forecast across much of the country April 16, with rainfall totals of over 7.5 cm (3 inches) possible in North-Western, Sabaragamuwa, and Western provinces. Isolated showers and storms are expected to continue particularly over the southern half of Sri Lanka April 17-18.

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 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, 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.