Bangkok: Six provinces in Thailand have been put on high alert as warnings of heavy rainfall and potential flash floods have been issued by the National Water Resources Management Committee (NWRC). The committee has cautioned residents in these provinces to remain vigilant due to the risk of continuous rain, which could lead to significant flooding, landslides, and mudslides.

According to Thai News Agency, Mr. Thanaroj Waratprasert, Director of the National Water Management Center and Deputy Spokesperson of the National Water Resources Office (NWRO), explained that the relatively strong southwest monsoon affecting the Andaman Sea, Thailand, and the Gulf of Thailand, along with a monsoon trough over upper Thailand, has resulted in increased rainfall in various regions. Specific areas experiencing heavy downpours have been identified through integrated forecast data and rainfall radar analysis.

In the next 12 hours, the eastern provinces of Rayong, Chanthaburi, and Trat, along with the southern provinces of Ranong, Phang Nga, and Phuket, are expected to face severe rainfall. These conditions may lead to waterlogging, disrupt transportation, and increase the risk of flash floods, landslides, and mudslides.

The NWRC has also projected heavy rainfall over the next three days, from June 1 to 3, 2026, pinpointing seven districts at high risk of receiving over 200 millimeters of accumulated rainfall. These include Umphang District in Tak Province; Mueang Trat, Khao Saming, Borai, and Khlong Yai Districts in Trat Province; and Khlung and Makham Districts in Chanthaburi Province.

In the past 24 hours, Nakhon Si Thammarat province recorded the highest rainfall in the country at 180 millimeters. This was followed by Nakhon Nayok with 96 millimeters, Chiang Mai with 81 millimeters, Phetchaburi with 72 millimeters, and Nakhon Pathom with 65 millimeters.

The NWRC forecasts a decrease in rainfall in upper Thailand from June 3 to 5, but warns that heavy rainfall will persist in certain areas. Eastern and southern regions of Thailand remain under threat due to the continuous influence of the strong southwest monsoon. Residents in at-risk areas are advised to keep abreast of weather warnings from government agencies and prepare for possible flash floods, landslides, and mudslides.