The warning was issued to people living in Uthai Thani, Kanchanaburi, Ratchaburi, Ranong and Phang Nga.

The bureau expects heavy downpours during the next one or two days and warned that flash floods and landslides might strike settlements and homes near foothills and those build near mountainous slopes.

In Phang Nga, the provincial disaster prevention and mitigation office's acting chief Bancha Sudkheao said a landslide had occurred at a road in Thap Put district following a storm.

"Relevant officials have managed to clear the road," he said.

In a related development, Ranong disaster prevention and mitigation office warned local residents to brace for possible flash floods and landslides.

There are 75 villages in the districts of Muang Ranong, Kapoe, Kra Buri and La-un as well as Suk Samran sub-district, which are considered to be areas at risk.

Muang Ranong district chief Boonyapat Chatara-urai said the Ranong governor's working trip to Phayam Island would be postponed to a later date because of rough seas.

"Waves are between two and three metres high," he said. The working trip was initially scheduled on Wednesday, when officials were expected to bring public services in mobile units to treat people on the island.