25 May 2021 | 03:41 PM UTC
Sri Lanka: Adverse weather including flooding and possible landslides forecast across Sri Lanka through at least May 27
Heavy rainfall, strong winds, and flooding forecast across Sri Lanka through at least early May 27.
Event
Thunderstorms with rounds of strong winds and flooding are forecast to continue across Sri Lanka through at least early May 27. Flooding has been ongoing across Sri Lanka, particularly in the Western, South, and Sabaragamuawa provinces, since May 12. As of May 25, at least 43,000 people have been impacted by the ongoing flooding, and at least five people have died.
Government Advisories
As of May 25, officials have issued red-level (highest-level) landslide warnings for portions of Nuwara Eliya and Ratnapura districts, including the Ambagamuwa, Ratnapura, Kuruwita, and Eheliyagoda divisional secretariats. Additionally, yellow- and orange-level landslide warnings are in place for portions of Galle, Kalutara, Kandy, Kegalle, Nuwara Eliya, and Ratnapura districts. Officials could update and possibly extend the coverage of the relevant weather alerts over the coming days.
Hazardous Conditions
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 the soil has become saturated by heavy rainfall.
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.
Transport
Floodwaters and debris flows could render some bridges, rail networks, or roadways impassable, impacting overland travel around affected areas. Ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters.
Severe weather could also trigger intermittent flight delays and cancellations at regional airports, though these are unlikely to be severe or prolonged. Flooding could block regional rail lines; freight and passenger train delays and cancellations are possible in areas that see heavy rainfall and potential track inundation. Localized business disruptions may occur in low-lying areas.
Advice
Monitor local media for weather updates and related advisories. Confirm all transport reservations and business appointments before travel. Make allowances for localized travel delays and potential supply chain disruptions where flooding has been forecast. Do not drive on flooded roads. Charge battery-powered devices in the case of prolonged electricity outages.
