Sri Lanka: Adverse weather forecast across much of the country through at least April 29

Event

Severe weather is forecast across Sri Lanka through at least April 29. The Sri Lankan Department of Meteorology issued an amber advisory for heavy rainfall and lightning, warning of a high risk of thundershowers accompanied by severe lightning in Western, Sabaragamuwa, Central, North Western, and Southern provinces and Jaffna, Killinochchi, and Mannar districts in Northern Province through late April 28. Heavy showers bringing rainfall amounts of 10 cm (4 inches) are expected in parts of these areas. As well as lightning, thunderstorms could also be accompanied by strong winds, and the public is advised to seek shelter during the passing of storms. There is a moderate risk of heavy rainfall and severe lightning across the rest of Sri Lanka on April 28. Further heavy rainfall and thunderstorms are forecast across much of the country on April 29. Officials could update and possibly extend the coverage of 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 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.

Transport
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.

Advice

Confirm flights. Monitor local media for updated emergency and weather information. Seek updated information on weather and road conditions before driving or routing shipments through areas where severe weather is forecast. Plan accordingly for potential delivery delays if routing shipments by truck through the affected area. Do not attempt to drive through flooded areas. Charge battery-powered devices in the case of prolonged electricity outages.