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 JOYCE-18
in Australiafrom 09 Jan 2018 18:00 UTC to 12 Jan 2018 12:00 UTC
Storm surge for tropical cyclone JOYCE-18

Green alert for storm surge impact in Australia

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 12 of tropical cyclone JOYCE-18 issued at 12 Jan 2018 12:00:00 (GDACS Event ID 1000431).


Current impact estimate:

  • Population affected by cyclone-strength winds (>120km/h): No people affected
  • Saffir-Simpson Category: Tropical storm
  • Maximum sustained wind speed: 93 km/h
  • The maximum Storm surge height is  1.0m in Thangoo, Australia. This height is estimated for 11 Jan 2018 18:00:00.


Previous calculations: see calculation for advisory number 5 6 7 8 9 10 11 12

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)
11 Jan 2018 18:00:00 Thangoo Australia  1.0m
11 Jan 2018 02:00:00 Derby Australia  0.9m
11 Jan 2018 18:00:00 Broome Australia  0.7m
11 Jan 2018 18:00:00 Waterbank Australia  0.6m
11 Jan 2018 17:00:00 Kennedys Cottage Australia  0.6m
10 Jan 2018 22:00:00 Pender Australia  0.5m
11 Jan 2018 01:00:00 Kollan I Australia  0.4m
12 Jan 2018 14:00:00 Condon Australia  0.3m
11 Jan 2018 05:00:00 Larrakeyah Australia  0.2m
11 Jan 2018 05:00:00 Nightcliff Australia  0.2m
11 Jan 2018 05:00:00 Fannie Bay Australia  0.2m
11 Jan 2018 05:00:00 Parap Australia  0.2m
11 Jan 2018 05:00:00 Darwin Australia  0.2m
11 Jan 2018 05:00:00 Ludmilla Australia  0.2m
Locations affected by Storm surge (15 of 16)
Calculation based on advisory number 12 of 12 Jan 2018 12:00:00.
(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.