Overall Green alert Tropical Cyclone for YUN-YEUNG-23
in Japan

Event summary

Tropical Cyclone YUN-YEUNG-23 can have a low humanitarian impact based on the maximum sustained wind speed, exposed population and vulnerability.

GDACS ID TC 1001007
From - To 05 Sep - 08 Sep
Exposed countries Japan
Exposed population No people in Category 1 or higher
Maximum wind speed 74 km/h Tropical storm
Maximum storm surge 0.3 m (08 Sep 02:00 UTC)
Vulnerability Low (Japan)


For more info on GDACS alert score click here.
Wind Storm surge Rainfall GDACS score
GDACS JTWC 46 km/h 0.3 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF n.a n.a. n.a. n.a.
GFS 94 km/h 0.8 m 480 mm 0.5
ECMWF 65 km/h 0.7 m 323 mm 0.5
Maximum expected impact (wind, storm surge and rainfall) using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
Japan - Tropical Cyclone YUN-YEUNG (ECHO 07 Sep 2023)Thu, 07 Sep 2023 11:54

  • A new tropical cyclone named YUN-YEUNG formed over the central Philippine Sea on 4 September and is moving northeast towards the central-southern coast of Honshu Island. On 7 September at 0.00 UTC, its centre was located over the sea approximately 400 km south of the central Wakayama Prefecture, Honshu Island, with maximum sustained winds of 74 km/h (tropical storm).
  • YUN-YEUNG is forecast to continue north-east slightly strengthening, it is forecast to pass close to the Izu Islands, and to make landfall in an area close to Tokyo on 8 September with maximum winds up to 60 km/h.
  • For the next 48 hours, heavy rainfall, strong winds and storm surge are forecast over Izu Islands, and central southern Honshu Island (particularly in the area of Tokyo). Heavy rain and strong wind warnings are in effect for most of the Prefectures of the aforementioned regions.
Japan - Tropical Cyclone YUN-YEUNG, update (ECHO 08 Sep 2023)Fri, 08 Sep 2023 10:37

  • Tropical cyclone YUN-YEUNG continued northward over the West Pacific Ocean toward the central Honshu Island on 7 September, as a tropical storm. On 8 September at 3.00 UTC, its centre was located over the Ocean approximately 170 km south of the border between Aichi and Shizuoka Prefectures, with maximum sustained winds of 83 km/h (tropical storm).
  • YUN-YEUNG is expected to make landfal over the Toyohashi City area (south-eastern Aichi Prefecture) on 8 September late in the morning (UTC), with maximum sustained winds up to 75 km/h. After that, it is expected to pass over the central Honshu Island on 8-9 September, further weakening.
  • Over the next 48 hours, heavy rainfall, strong winds and storm surges are forecast over the central and northern Honshu Island.
  • The Japan Meteorological Agency has issued warnings for heavy rainfall, floods and landslides over the Greater Tokyo Area and the neighbouring Chiba Prefecture. A number of preventive evacuation orders have been already issued for this area.
Japan - Tropical Cyclone YUN-YEUNG, update (ECHO 11 Sep 2023)Mon, 11 Sep 2023 11:26

  • The passage of the tropical storm YUN-YEUNG over the central Honshu Island, west of the Greater Tokyo area, on 8-9 September, caused very heavy rainfall, strong winds, floods and landslides that have resulted in casualties and damage.
  • Media reports, as of 11 September, three fatalities across Ibaraki and Chiba Prefectures. In addition, approximately 1,200 flooded buildings were reported accross the aforementioned Prefectures and the Fukushima Prefecture.
  • Over the next 72 hours, more rainfall is forecast over the central and western Honshu Island. 
Detailed event map. European Union, 2024. Map produced by EC-JRC.
The boundaries and the names shown on this map do not imply official endorsement or acceptance by the European Union.

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For this events, GDACS has links to information from the following sources: EC-JRC (40), (2), WMO (1), INFORM (2),