Typhoon Bualoi left widespread destruction following heavy rainfall in northern Thailand.

Footage shows rice fields submerged under floodwater beneath a gloomy sky in Uttaradit province on September 30.

More than 2,000 households across three districts were affected, with rescuers finding families begging for food and water.

Officials said the floods were the 'worst in four decades' as more boats and supplies were being delivered to the stricken communities.

Bualoi hit Vietnam early Monday morning with winds reaching 130 km per hour, leaving at least 26 people dead and 22 missing.

Authorities confirmed that Bualoi triggered at least eight tornadoes across several provinces in Vietnam, including Nam Dinh, Ninh Binh, Hai Phong, Hai Duong, Thanh Hoa, Thai Binh, Quang Ninh, and Hanoi.

In Ninh Binh, the extreme weather left nine people dead and 18 injured. Eleven single-storey houses collapsed, 126 homes were damaged, and 53 utility poles were brought down.

Bualoi had previously caused at least 20 deaths in the Philippines and forced hundreds of thousands of families into evacuation centres.

The Thai Meteorological Department said Bualoi has been downgraded to an active low-pressure system over Laos. It was expected to cause heavy rainfall and flooding in northern regions while moving along the monsoon trough across the region.

The Department of Disaster Prevention and Mitigation said at least seven were killed in floods in Thailand.