Bangkok: Northern Thailand is on high alert for continued heavy rainfall expected to persist until tomorrow. The Meteorological Department has issued Warning No. 10, highlighting the risk of heavy to very heavy rainfall and accumulated precipitation due to a monsoon trough impacting the northern and upper northeastern regions, coupled with a strong southwest monsoon.
According to Thai News Agency, areas at high risk include Uttaradit, Phitsanulok, and Tak, with heavy rainfall anticipated in parts of the northern and upper northeastern regions, as well as monsoon-affected zones such as the western central region, the eastern region, and the Andaman coast of the southern region. Residents in these areas are advised to remain vigilant for potential flash floods, landslides, and mudslides, particularly in hillside and low-lying areas.
Regarding the flood situation in Nan Province, data from the Water Resources Information Institute (WRII) indicates that despite a decreasing trend in rainfall, the cumulative rainfall in the past 24 hours reached 339.6 millimeters in Pua District, leading to heavily saturated soil. WRII has issued warnings to closely monitor areas at risk of flash floods and river overflows in Nan Province until August 21st, particularly in Tha Wang Pha, Bo Kluea, Mae Chrim, and Santi Suk Districts, as well as high-risk areas in Phayao, Phitsanulok, Kalasin, and Trat Provinces.
It is anticipated that the overall rainfall in upper Thailand will temporarily decrease from August 22nd onwards. However, monitoring of water levels in the Mekong River in upper northeastern Thailand remains critical due to additional water flow from Laos. Although rainfall in northern Thailand is expected to decrease to 40-60% of the area between August 22nd and 25th, heavy rainfall in some areas is still expected, necessitating continued monitoring. In the upper Gulf of Thailand and upper Andaman Sea, strong winds and high waves of 2-3 meters are predicted, with waves exceeding 3 meters in areas with thunderstorms. Small boats are advised to stay ashore.
The highest 24-hour cumulative rainfall in Nan Province was recorded by the Water Resources Information Institute (WRII) in Phu Kha Subdistrict, Pua District, measuring 339.6 millimeters. Many areas experienced rainfall exceeding 200 mm, increasing the risk of flash floods, landslides, and river overflows. A weather alert has been issued for high-risk areas in Nan Province, including Tha Wang Pha, Bo Kluea, Mae Chrim, and Santisuk districts, as well as parts of Phayao, Phitsanulok, Kalasin, and Trat provinces, urging vigilance for continued rainfall until August 21st.