Honda had made Thailand its Asian manufacturing hub, producing cars, motorcycles and power products for export worldwide. In October 2011, the worst floods in Thailand's modern history submerged the industrial estates where Honda's plants sat. Honda Automobile Thailand suspended car production on 4 October; motorcycle production stopped on 11 October; power products on 6 October.
The Thai plant accounted for 4.7% of Honda's global output, but the disruption was far larger than that figure suggests. Thailand supplied parts to Honda's assembly lines in the US and Canada. Within weeks, those plants cut production by 50%. Honda withdrew its earnings guidance and reported a sharp fall in quarterly profit. Analysts estimated Thailand's auto industry would lose about 130,000 units of production.
The floods lasted three months. Honda's recovery took longer: parts shortages persisted into 2012, and the company did not return to full production for months. It was the second supply-chain shock of 2011 — the Tohoku earthquake in March had already exposed the fragility of concentrated Japanese supply. Two disasters in one year proved the pattern was structural, not bad luck.
Honda had no backup for Thai parts, so a local flood became a global cut: output halved for months, and earnings guidance was withdrawn.
Honda concentrated Thai production in flood-prone industrial estates without adequate geographic diversification; one weather event shut the whole hub.
Parts supply from Thailand fed assembly lines in the US and Canada, so a local flood became a global production cut — the supply chain had no alternative source.
The Tohoku earthquake seven months earlier had already exposed concentrated-supply risk, but Honda had not yet diversified when the floods hit.
Concentrating production in one geography cuts costs until the geography fails. Honda's Thai hub was efficient right up until the water arrived.
Honda diversified its supply base after 2011, adding production capacity in other countries and building buffer inventory for critical parts. The 2011 floods became a standard case study in supply-chain risk management, taught alongside the Tohoku earthquake as the year the just-in-time model met its limits.
FOLLOW THE EVIDENCE