Bangkok: The Meteorological Department has issued a warning that heavy rainfall is expected to persist in some areas of lower southern Thailand, urging six provinces to prepare for potential flash floods and landslides.

According to Thai News Agency, the warning particularly concerns the provinces of Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, and Narathiwat. The ongoing heavy rainfall is attributed to the relatively strong northeast monsoon affecting the Gulf of Thailand, southern Thailand, and the Andaman Sea. Residents in the affected areas are advised to remain vigilant against the dangers posed by intense and prolonged rainfall, which could lead to flash floods and landslides, especially in regions on slopes near waterways and low-lying areas.

Wave conditions in the lower Gulf of Thailand are reported to be quite rough, with waves reaching heights of 2-3 meters, escalating to over 3 meters in zones experiencing thunderstorms. In the upper Gulf of Thailand, waves are around 2 meters high, with similar height increases in stormy areas. Mariners in both the Gulf of Thailand and the Andaman Sea have been advised to exercise caution and avoid sailing in regions experiencing thunderstorms. Small boats in the lower Gulf of Thailand are specifically urged to stay ashore until December 28, 2025. Additionally, residents along the lower eastern coast of southern Thailand should remain cautious of strong waves impacting the shore.

In contrast, upper Thailand is experiencing cool to cold weather conditions, influenced by a relatively strong high-pressure system or cold air mass spreading from China. People in this region are encouraged to take health precautions against the cold weather and remain aware of the potential fire hazards due to the dry air.

The current accumulation of particulate matter or haze in upper Thailand is reported to be at a good level, thanks to prevailing winds and effective ventilation.