Bangkok: Upper Thailand is bracing for persistent heavy rainfall, with certain areas in the North and Northeast predicted to face very heavy rain, posing risks of flash floods and forest runoff.

According to Thai News Agency, the Meteorological Department has issued a warning for the next 24 hours, highlighting that provinces such as Chiang Rai, Phayao, Nan, Nong Khai, Bueng Kan, Udon Thani, Sakon Nakhon, and Nakhon Phanom will be particularly affected. Residents in these regions are urged to stay vigilant against potential dangers like flash floods and overflowing rivers, especially in areas close to hillsides, waterways, and lowland zones.

The adverse weather conditions are attributed to a moderate southwest monsoon affecting the Andaman Sea, Thailand, and the Gulf of Thailand, alongside a low-pressure system over the northern coast of Vietnam and the Gulf of Tonkin. These atmospheric disturbances are expected to continue influencing weather patterns across the region.

In addition to the rain, maritime conditions are also affected, with waves in the upper Andaman Sea and the upper Gulf of Thailand reaching approximately 2 meters high. Thunderstorm areas are experiencing even higher waves. Sailors are advised to exercise caution and avoid storm-affected areas.

The weather forecast outlines thunderstorms in 80 percent of the northern region, with heavy to very heavy rain expected in several provinces including Mae Hong Son, Chiang Mai, and Nan. The northeastern region is anticipating thunderstorms in 70 percent of the area, with similar rainfall intensity expected in provinces like Loei, Nong Khai, and Udon Thani. Meanwhile, the central and eastern regions are also on alert, with significant rainfall expected in select areas.

The southern regions, both east and west coasts, are experiencing a lesser likelihood of thunderstorms, but sea conditions remain rough, necessitating caution for those venturing out to sea. In Bangkok and its vicinity, there is a 60 percent chance of thunderstorms and heavy rain, highlighting the widespread impact of the current weather system.