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 Orange alert Tropical Cyclone for OCKHI-17
in India, Maldives, Sri Lankafrom 29 Nov 2017 18:00 UTC to 05 Dec 2017 06:00 UTC
Storm surge for tropical cyclone OCKHI-17

Green alert for storm surge impact in India

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 23 of tropical cyclone OCKHI-17 issued at 5 Dec 2017 6:00:00 (GDACS Event ID 1000422).


Current impact estimate:

  • Population affected by cyclone-strength winds (>120km/h): No people affected
  • Saffir-Simpson Category: Category 3
  • Maximum sustained wind speed: 185 km/h
  • The maximum Storm surge height is  0.7m in Mahuva, India. This height is estimated for 05 Dec 2017 18:00:00.


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

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)
05 Dec 2017 18:00:00 Mahuva India  0.7m
05 Dec 2017 18:00:00 Kathiwadar Bandar India  0.7m
05 Dec 2017 18:00:00 Kotada India  0.6m
05 Dec 2017 18:00:00 Jafarabad India  0.6m
05 Dec 2017 18:00:00 Ghogha India  0.6m
05 Dec 2017 18:00:00 Palghar India  0.6m
05 Dec 2017 18:00:00 Mahim India  0.6m
05 Dec 2017 18:00:00 Diva India  0.6m
05 Dec 2017 18:00:00 Asarsa India  0.6m
05 Dec 2017 18:00:00 Vasai India  0.6m
05 Dec 2017 18:00:00 Nalasopara India  0.6m
05 Dec 2017 18:00:00 Agashi India  0.6m
05 Dec 2017 18:00:00 Mumbai India  0.6m
05 Dec 2017 18:00:00 Asumumbay India  0.6m
Locations affected by Storm surge (15 of 158)
Calculation based on advisory number 23 of 05 Dec 2017 06:00:00.
(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.