Flooding in Northern Sumatra Displaces Hundreds as Indonesia Faces Rising Climate Risks

MEDAN, Indonesia — A flash flood tore through two remote villages in North Tapanuli Regency, North Sumatra, on Wednesday evening, April 22, forcing roughly 150 families to flee their homes and seek shelter in a church and a village office as rescue teams raced to assess the damage.

The deluge, triggered by hours of heavy rain, struck the Simangumban Julu and Aek Nabara villages in Simangumban district shortly after 6:20 p.m. local time. It swept away three houses, destroyed a small mosque and an educational facility, and washed out a bridge, according to the National Disaster Mitigation Agency, or BNPB. One resident was injured after being dragged by the rushing waters.

No deaths have been reported, officials said. By Thursday, power remained cut off across the affected area, and emergency teams were still tallying the full extent of the destruction.

“Besides material losses, one person was reported injured after being swept away by the flash flood debris,” said Abdul Muhari, head of BNPB’s data and information center.

Residents took refuge at the GKPA Simangumban Church and the Aek Nabara village office, where local authorities distributed basic relief supplies. The choice of locations allowed for easier coordination of aid and support in a region where infrastructure is limited and many homes sit near swollen rivers.

The incident is the latest in a string of hydrometeorological disasters across Indonesia this week, underscoring the country’s acute vulnerability to extreme weather. North Sumatra’s disaster agency said assessments were continuing, with joint teams from local and provincial authorities on the ground.

The Indonesian Meteorology, Climatology and Geophysics Agency (BMKG) had issued warnings for heavy to torrential rainfall across parts of North Tapanuli in the days leading up to the flood. Such alerts have become more frequent as climate change intensifies monsoon patterns and raises the risk of sudden, destructive flooding in hilly and mountainous terrain.

North Tapanuli, a predominantly rural regency known for its rolling landscapes and agricultural communities, has faced repeated flooding in recent years. Experts link the trend to a combination of deforestation, rapid land-use changes, and more intense rainfall events.

Provincial and regency officials said they were monitoring the situation for potential follow-on floods or landslides, especially as saturated soil increases the danger from any additional downpours. Residents have been urged to stay away from riverbanks and report prolonged heavy rain immediately. []