GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

Overall Green alert Tropical Cyclone for YAGI-18
in China, Japanfrom 06 Aug 2018 18:00 UTC to 10 Aug 2018 18:00 UTC
Storm surge for tropical cyclone YAGI-18

Orange alert for storm surge impact in China

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 17 of tropical cyclone YAGI-18 issued at 10 Aug 2018 18:00:00 (GDACS Event ID 1000481).


Current impact estimate:

  • Population affected by cyclone-strength winds (>120km/h): No people affected
  • Saffir-Simpson Category: Tropical storm
  • Maximum sustained wind speed: 83 km/h
  • The maximum Storm surge height is  1.0m in Changchuanba, China. This height is estimated for 12 Aug 2018 20:00:00.


Previous calculations: see calculation for advisory number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Show forecast grid

Storm surge

View animation and affected locations in an interactive map: open

Storm surge maximum height
Storm surge maximum height (Source: JRC)
Storm surge animation
Storm surge animation (Source: JRC)

Affected locations

Date Name Country Storm surge height (m)
12 Aug 2018 20:00:00 Changchuanba China  1.0m
12 Aug 2018 20:00:00 Dinggang China  1.0m
12 Aug 2018 20:00:00 Ancheng China  1.0m
12 Aug 2018 20:00:00 Chang-chia-li China  1.0m
12 Aug 2018 20:00:00 Hsi-hui-tsui China  1.0m
12 Aug 2018 20:00:00 Ch'ien-ni China  1.0m
12 Aug 2018 20:00:00 Chengpu China  1.0m
12 Aug 2018 20:00:00 Songxia China  1.0m
12 Aug 2018 20:00:00 Linshan China  1.0m
12 Aug 2018 20:00:00 Heng-pa-ts'un China  1.0m
12 Aug 2018 20:00:00 Chiu-hsiang-chen China  0.9m
12 Aug 2018 20:00:00 Huangwan China  0.9m
12 Aug 2018 20:00:00 Hsieh-t'ang China  0.9m
12 Aug 2018 20:00:00 Chu-ch'iao-chen China  0.9m
Locations affected by Storm surge (15 of 549)
Calculation based on advisory number 17 of 10 Aug 2018 18:00:00.
(Simulation using 0.5 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. The model has been validated mainly in areas of shallow water (Caribbean, Bay of Bengal). Results in other basins may be inaccurate.

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