Bangkok flood forecast

HydroFormer, 500 m cells, +1 to +6 h

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Replay: forecast of 26 Sep 2026 09:00 (flood)

Lead time

+3 h

Cells with flood probability ≥ 50 %–

Area–

Layer

Flood probability (> 10 cm) Forecast depth Water now (simulated from observed rain) Rain, last 12 h (gauges)

BMA road flood sensors (observed) Rain gauges

Forecast by lead time

Lead	Cells ≥ 50 %	Cells ≥ 20 %	Max depth

Chao Phraya at Krung Thep Bridge (m)

Solid: observed, last 24 h. Dashed: tidal extrapolation, next 6 h.

Inputs

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The model forecasts a simulator of the drainage system, not observed street flooding. It was trained on the 2022–2025 monsoons and validated against simulated depths (CSI 0.43 on the 2026 season), and its probabilities match citizen flood reports only slightly better than chance (AUC 0.56–0.58). Use it as a guide to flood-prone areas, not as a street-level warning.

The forecast is recomputed every hour on GitHub Actions and this page reloads it every 5 minutes.

Code, weights and method: github.com/Sompote/bangkok-flood-forecast. AI Research Group, Department of Civil Engineering, KMUTT.