Overall Green alert Tropical Cyclone for NEPARTAK-21
in Japan

Event summary

Tropical Cyclone NEPARTAK-21 can have a low humanitarian impact based on the maximum sustained wind speed, exposed population and vulnerability.

GDACS ID TC 1000802
Name NEPARTAK-21
From - To 23 Jul - 28 Jul
Exposed countries Japan
Exposed population No people in Category 1 or higher
Maximum wind speed 83 km/h Tropical storm
Maximum storm surge 0.5 m (27 Jul 17:00 UTC)
Vulnerability Low (Japan)

GDACS Score

For more info on GDACS alert score click here.
Wind Storm surge Rainfall GDACS score
GDACS JTWC 46 km/h 0.5 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF 104 km/h 1.1 m 381 mm 0.5
GFS 122 km/h 1.2 m 818 mm 0.5
ECMWF 115 km/h 1.1 m 552 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 NEPARTAK (ECHO 27 Jul 2021)Tue, 27 Jul 2021 15:36

  • Tropical Cyclone NEPARTAK formed on 23 July in the North Pacific Ocean, moving towards the eastern coast of Honshu Island (central Japan). On 27 July at 0.00 UTC, it was 170 km south-east of Choshi City (Chiba Prefecture) and 200 km south-east of Greater Tokyo Area, with maximum sustained winds of 83 km/h (tropical storm).
  • NEPARTAK is forecast to weaken as it moves north-west, making landfall in an area close to Sendai City (Tohoku Region) in the evening of 27 July, with maximum sustained winds between 75-85 km/h (tropical storm). Evacuation orders have been issued for Atami City (south of Tokyo), which has been heavily impacted by recent floods and landslides. NEPARTAK could also impact the Olympic Games in Tokyo.
  • Storm and high wave warnings have been issued for coastal areas from southern Fukushima Prefecture to northern Miyagi Prefecture. Moderate to heavy rainfall and strong winds are forecast over most of central and northern Honshu, including Greater Tokyo Area.
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.

Updates on volcanic activity (Smithsonian)

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Estimated casualties (PAGER)

USGS estimates the number of casualties for each earthquake for the Prompt Assessment of Global Earthquakes for Response (PAGER) product.
The graph shows the current fatalities estimate.

Exposed population

Data, images, links, services and documents

For this events, GDACS has links to information from the following sources: EC-JRC (38), (2), WMO (1), INFORM (2),