Overall Green alert Tropical Cyclone for YAGI-18
in China, Japan

Green alert for storm surge impact based on GFS source

The JRC has developed an experimental global storm surge model, which is run after each advisory issued by the regional tropical cyclone centres. The calculations are published about 20 minutes after a new advisory is detected by GDACS. The calculations identify the populated places affected by storm surge up to three days in advance, using the forecasted track. When forecasts change, the associated storm surge changes too and alert levels may go up or down.

This report is for advisory number 15 of tropical cyclone YAGI-18 issued at 10 Aug 2018 6:00:00 (GDACS Event ID 1000481). However, the calculation for advisory number is not completed. Therefore, the latest available calculation is shown. All links, data, statistics and maps refer to the latest available calculation.


Population affected by cyclone-strength winds (>120km/h):No People
Saffir-Simpson Category: Tropical storm
Maximum sustained wind speed: 85 Km/h
he maximum Storm surge height is:  0.8m in Gozawa, Japan.

Storm surge

View animation and affected locations in an interactive map: open

Storm surge maximum height
Storm surge maximum height (Source: JRC)
Max windspeed
Max windspeed (Source: ECMWF)


people affected <=10000
people affected >10000 and <100000
people affected >100000

Calculation Alert color Date (UTC) Wind speed Population affected
TS CAT. 1 CAT. 2 CAT. 3 CAT. 4 CAT. 5 Countries
20180806.18 98 km/h (61 mph) No people
20180807.00 89 km/h (55 mph) No people
20180807.06 85 km/h (53 mph) No people

Affected locations

Alert Date (UTC) Name Country Storm surge height (m)
07 Aug 2018 07:00 Gozawa Japan  0.8
07 Aug 2018 07:00 Amidagawa Japan  0.8
07 Aug 2018 07:00 Nagashima Japan  0.8
07 Aug 2018 07:00 Nakazawa Japan  0.8
07 Aug 2018 07:00 Uchimambe Japan  0.8
07 Aug 2018 07:00 Kobashi Japan  0.8
07 Aug 2018 07:00 Shinio Japan  0.8
07 Aug 2018 07:00 Shimizu Japan  0.8
07 Aug 2018 07:00 Okunai Japan  0.8
07 Aug 2018 07:00 Aburakawa Japan  0.8
07 Aug 2018 07:00 Natsuida Japan  0.8
07 Aug 2018 07:00 Okamachi Japan  0.8
07 Aug 2018 07:00 Nishitazawa Japan  0.8
07 Aug 2018 07:00 Yasula Japan  0.8
Locations affected by Storm surge (15 of 3115)
Calculation based on advisory number of 07 Aug 2018 06:00.
(Simulation using minute resolution)

See full locations list (RSS)

More information

The atmospheric forcing included in the storm surge model are the pressure drop and the wind-water friction. The effects of the short waves induced by the wind (wave setup) and the precipitations are not yet implemented in the model.

  • Interactive map: open

For a full list of available products related to this event, please refer to the GDACS Resources page.