Death toll in South, Southeast Asia rises in wake of stormーNHK WORLD-JAPAN NEWS

Key Concepts

• Torrential Rain: Extremely heavy rainfall.
• Casualties: Deaths and injuries resulting from a disaster.
• Unprecedented Rainfall: Rainfall levels that have never been recorded before.
• La Niña: A climate phenomenon characterized by cooler-than-normal sea surface temperatures in the equatorial Pacific Ocean, which can influence weather patterns globally.
• Cyclone: A large-scale air mass that rotates around a strong center of low atmospheric pressure.
• Malacca Strait: A narrow stretch of water between the Malay Peninsula and the Indonesian island of Sumatra.
• Climate Change: Long-term shifts in temperatures and weather patterns.
• New Normal: The idea that extreme weather events are becoming more frequent and intense due to climate change.

Rescue and Recovery Efforts

Rescue and recovery efforts in southern Thailand and other affected regions are facing significant challenges. The full extent of the damage, including the number of casualties, remains unclear, particularly in Indonesia and Sri Lanka. A major obstacle is the inaccessibility of some severely impacted areas due to damaged roads. On Indonesia's Sumatra Island, a mountainous region, many people are believed to be trapped and awaiting rescue. In Thailand, the city of Hat Yai, a densely populated area, was heavily impacted by floods. Water levels rose so rapidly that residents had to seek refuge on rooftops, waiting for rescue. It took several days for the floodwaters to recede, after which it was confirmed that over 100 people had died in the city.

Causes of Intense and Widespread Damage

The intensity and widespread nature of the flooding this time are attributed to an unusual combination of weather systems, exacerbated by unprecedented rainfall levels.

• Massive Rainfall in a Short Period: The region experienced an exceptionally large volume of rain within a short timeframe. Thai officials reported that the hardest-hit area in southern Thailand recorded its highest single-day rainfall in 300 years.
• Previous Weather Events: Parts of Southeast Asia, including the Philippines and Vietnam, had already been affected by heavy rains due to a series of typhoons earlier in the month. Additionally, seasonal rains had caused floods and landslides in parts of Thailand and Indonesia.
• Unusual Combination of Weather Systems: The significant rainfall since late last month is being blamed on a rare confluence of weather phenomena.
  • La Niña: Experts point to the La Niña phenomenon, which occurs when waters in the eastern Pacific Ocean are cooler than normal. This can lead to a warm and wet atmosphere in the Southeast Asian region.
  • Cyclone Formation: A cyclone developed around the Malacca Strait, situated between Sumatra Island and the Malay Peninsula. According to a Japanese weather official, it is rare for such a cyclone to form near the equator, as the winds in Southeast Asia are typically too weak to propel a cyclone significantly.
  • Slow-Moving Cyclone: The cyclone's slow movement allowed it to linger over the area for an extended period, resulting in prolonged and heavy rainfall across a wide region, from the Malay Peninsula to Sumatra Island. This resulted in an average rainfall of over 300 to 400 millimeters.

Role of Climate Change

Experts also highlight climate change as a contributing factor to the increased intensity and frequency of these extreme weather events. Some suggest that these events should be accepted as the "new normal" and that preparations should be made for future occurrences.

Conclusion

The recent severe flooding in southern Thailand and other parts of South and Southeast Asia was a result of an unprecedented volume of rainfall occurring in a short period. This extreme weather event was driven by an unusual combination of meteorological factors, including the La Niña phenomenon and a rare, slow-moving cyclone in the Malacca Strait. Experts also emphasize the role of climate change in exacerbating the intensity and frequency of such extreme weather, suggesting that these events may represent a new reality that communities must prepare for. Rescue and recovery efforts are ongoing but are hampered by the scale of the damage and limited access to affected areas.