# Typhoon Dujuan approaches the Tokyo region with the highest-level landslide warning issued for Izu Oshima

Japan's weather agency placed parts of the Kanto region under Level 4 danger warnings, and organisers postponed an Asian Games equestrian event in Aichi.

- Published: 2026-09-21T05:16:54.216Z
- Canonical: https://polylog.news/2026-09-21/typhoon-dujuan-approaches-the-tokyo-region-with-the-highest
- Publisher: Polylog (Global desk)
- Section: world
- Sources: [The Japan Times](https://www.japantimes.co.jp/news/2026/09/21/japan/typhoon-dujuan-japan/), [Jiji Press](https://www.jiji.com/jc/article?k=2026092100225&g=soc), [The Hindu](https://www.thehindu.com/news/international/typhoon-approaches-eastern-japan-prompting-flood-and-landslide-warnings/article71489961.ece)

Typhoon Dujuan, the twenty-fifth named storm of Japan's season, made landfall on the Boso Peninsula in Chiba Prefecture, east of Tokyo, on September 21, [carrying sustained winds of 126 kilometres per hour and gusts up to 180 kilometres per hour](https://www.bloomberg.com/news/articles/2026-09-21/typhoon-dujuan-threatens-tokyo-with-rains-winds-as-flights-hit) as it brought heavy rain across eastern Japan, with [Level 4 danger warnings issued for some areas](https://www.japantimes.co.jp/news/2026/09/21/japan/typhoon-dujuan-japan/). The Japan Meteorological Agency issued a special landslide warning for Izu Oshima, its highest category, [Jiji Press reported](https://www.jiji.com/jc/article?k=2026092100225&g=soc).

Flood and landslide warnings extend across eastern prefectures, and organisers of the Asian Games in Aichi prefecture [postponed the equestrian eventing competition until Tuesday](https://www.thehindu.com/news/international/typhoon-approaches-eastern-japan-prompting-flood-and-landslide-warnings/article71489961.ece). As the storm crossed the country, authorities confirmed one death and one minor injury in Miyazaki Prefecture, in southern Japan, [Bloomberg reported](https://www.bloomberg.com/news/articles/2026-09-21/typhoon-dujuan-threatens-tokyo-with-rains-winds-as-flights-hit). Organisers closed Tokyo Game Show 2026 a day early because of the storm, and airlines cancelled flights serving the capital region.

A storm crossing the Tokyo metropolitan area halts rail, air and port movement in the largest urban economy in the world by output, and the cost sits mainly in lost activity and interrupted logistics rather than in destroyed property. Japanese non-life insurers have absorbed a rising frequency of these events, which they price into renewals, while the business interruption that follows a one-day shutdown, and the confirmed fatality in Miyazaki, are largely outside what property insurance captures and land directly on company results and public health accounting instead.

## What this means

Japanese non-life insurers carry the property claims and pass the cost into next year's premium rates, while manufacturers and retailers absorb the interruption losses that no policy covers. Repeated storms of this kind push up the domestic cost of doing business without appearing in any single quarter's headline damage figure, and they complicate the Bank of Japan's reading of soft activity data because weather-driven weakness looks like demand weakness in the monthly numbers.

## What to watch

- Whether Tokyo's rail and airport operations suspend services, the measure of how much national activity the storm actually removes.
- Reported damage and claims estimates from Japanese non-life insurers, which feed directly into next year's premium pricing.
- Japanese production and retail data for September, where a weather-driven dip can be mistaken for a change in underlying demand.