Bangkok: Dr. Thon Thamrongnawasawat, a lecturer at the Department of Marine Science, Faculty of Fisheries, Kasetsart University, has raised alarms over the increasing frequency of extreme rainfall events, often referred to as “rain bombs,” affecting the southern regions. The Royal Irrigation Department is actively draining water after Hat Yai experienced its most intense rainfall in 300 years.

According to Thai News Agency, Dr. Thon highlighted on his Facebook page that recent mild cold winds have been accompanied by concentrated rain in the lower southern region. A new cold front is expected to move the rain towards Malaysia, offering temporary relief. The current weather pattern, influenced by La Nina and global warming, has led to unusually heavy rainfall, with hundreds of millimeters falling in a short span. Dr. Thon emphasized the urgent need to address greenhouse gas emissions, which are exacerbating these weather phenomena.

The Royal Irrigation Department reported that the extreme rainfall in Hat Yai is primarily due to the heaviest rain in the region’s history, with over 300-500 mm falling in 24 hours. The department, in conjunction with other agencies, is working at full capacity to drain the water. The Smart Water Operations Center (SWOC) attributed the severe flooding to a monsoon trough and low-pressure area affecting the southern and lower southern regions since November 19, 2015, resulting in heavy rainfall across 10 provinces, including Chumphon and Surat Thani.

In Songkhla Province, particularly Hat Yai District, the rainfall reached record levels, with 335 mm recorded on November 21, 2015. The accumulated rainfall over three days exceeded 630 mm, surpassing the major 2010 flood. The flooding in Hat Yai Municipality led to water levels between 0.50-2.50 meters and caused rivers and canals to overflow. Despite ongoing rain, a decrease is expected, with hopes of normalcy within 3-5 days.

Efforts by the Royal Irrigation Department include the deployment of 32 water pumps and 14 water pushers. These measures aim to expedite drainage, especially through the Phuminat Damri Canal, which has a capacity of 1,200 cubic meters per second. The canal’s capacity, alongside the Bang Yi Pumping Station, has been crucial in mitigating the impact on Hat Yai District. The department plans to continue mobilizing resources to manage water levels in low-lying areas.