Record Flooding in Bangkok: 300mm of Rain in 48 Hours, Overflowing Canals, and State of Disaster Declared

Since Thursday, Bangkok has recorded nearly 300 millimeters of rain, equivalent to two months of normal rainfall, which has overwhelmed canal networks and triggered a state of disaster in the city's 50 districts.

What's happening: Flooding in Bangkok and its figures

Heavy rains, amplified by a persistent tropical front, hit the eastern part of the metropolis where evacuation routes are most vulnerable. Canals, already near their maximum capacity, have overflowed, flooding streets, markets, and residences. According to Météo France, observed rainfall far exceeds alert thresholds of 100mm in 24 hours, reaching triple this value. The state of emergency, declared by Bangkok's governor, mobilizes over 10,000 rescue agents, pumping boats, and temporary shelters.

Satellite data from Copernicus, combined with a neural network trained on regional climate archives, has allowed real-time mapping of the most affected areas. The predictive model GraphCast, used by Thailand's Meteorological Department, had anticipated precipitation intensity above 250mm, but reality exceeded predictions, highlighting the limits of models when faced with extreme events.

In total, over 200,000 residents are currently under alert, with main roads like Sukhumvit and Rama IV completely impassable. Public transport services, including the BTS Skytrain, have suspended several lines, exacerbating travel and humanitarian aid logistics. Authorities also declared that floods could persist as long as the ground remains saturated, risking new overflows in the coming days.

Why: Mechanisms of heavy rainfall and canal saturation

The phenomenon is explained by the confluence of several climatic factors. A monsoon strengthened by ocean warming has generated record atmospheric humidity, creating an environment conducive to intense downpours. The tropical front, interacting with the flat topography of the Chao Phraya plain, has favored the formation of dense clouds that have released their water in continuous bursts.

Meanwhile, Bangkok's rapid urbanization has reduced permeable surfaces, increasing surface runoff. Soils, already saturated by previous rains, no longer have the capacity to absorb excess water, contributing to canal overflows. AI models, notably those based on machine learning, have identified this combination as a multiplier factor for flooding, but the complexity of local interactions makes precise prediction beyond 48 hours difficult.