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 DAHLIA-17
in Indonesia, Christmas Islandfrom 30 Nov 2017 00:00 UTC to 03 Dec 2017 18:00 UTC
Automatic impact report for tropical cyclone DAHLIA-17
alertimage

Current Green alert for wind impact in Indonesia, Christmas Island as of 03 Dec 2017 18:00:00 UTC

This tropical cyclone is expected to have a low humanitarian impact based on the storm strength and the affected population in the past and forecasted path.

Current storm status

This report is for advisory number 16 of tropical cyclone DAHLIA-17 issued at 03 Dec 2017 18:00 UTC (GDACS Event ID 1000423, Latest episode ID: 16, inserted at 03 Dec 2017 19:48 UTC ).

Current impact estimate:

  • Population affected by Category 1 (120 km/h) wind speeds or higher is 0
  • Tropical Storm (maximum wind speed of 102 km/h)
  • Vulnerability of affected countries:

Impact of Extreme Wind

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  
Cloud map
Cloud map. Track and wind-buffer map. Green area: Area that can be affected by winds of more than 64 km/h (Tropical Storm strength). Orange area: Same, for winds of more than 92 km/h. Red area: Same, for winds above 120 km/h (Hurricane or Typhoon strength) (Source: JRC)
Cloud Map Zoomed on last forecast
Cloud Map Zoomed on last forecast. The zoomed map on the last track. (Source: JRC)

Affected population

Up to 14.9 million people people can be affected by wind speeds of tropical storm strength or above. In addition, no people people are living in coastal areas below 5m and can therefore be affected by storm surge.

Affected provinces

Region Province Country Population
Jawa Tengah Indonesia 30.6 million people
Christmas I. Christmas Island -
Jawa Barat Indonesia 38 million people

Affected Populated Places (first 20 records)

Name Region Province Country City class Population Distance
The Settlement Christmas Island Capital <1000 people 914 km
Garut Jawa Barat Indonesia City 120000 people 1058 km
Soreang Jawa Barat Indonesia City 150000 people 1097 km

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Nearby and affected airports
Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Christmas Island XCH 279 Civ. Paved Yes 6900 912 km
Tunggul Wulung 21 Civ. Paved No 4500 969 km
Cilacap Wulung CXP unknown 0 969 km
Pangandaran 5 0 982 km
Cibeureum 366 0 1030 km
Major ports
Name LOCODE Country Distance
Christmas Island Christmas Island 912 km
Cilacap IDCXP Indonesia 961 km
Tjilatjap, Java IDTJI Indonesia 962 km
Genteng Indonesia 1122 km

See complete report

Event time line

The storm evolution is shown in the table below. Alert levels and population estimates are related to the area from a point to the next.

Advisory Alert color Date (UTC) Category Wind speed Wind gusts Population affected
by cyclone winds (>120km/h)
Location (lat, lon)
1
GREEN
30 Nov 2017 00:00 Tropical storm 65 km/h (40 mph) km/h ( mph) no people -8.9, 104.4
2
GREEN
30 Nov 2017 06:00 Tropical storm 65 km/h (40 mph) km/h ( mph) no people -8.9, 106.2
3
GREEN
30 Nov 2017 12:00 Tropical storm 83 km/h (52 mph) km/h ( mph) no people -9.3, 107.6
4
GREEN
30 Nov 2017 18:00 Tropical storm 83 km/h (52 mph) km/h ( mph) no people -9.6, 108.1
5
GREEN
01 Dec 2017 00:00 Tropical storm 93 km/h (57 mph) km/h ( mph) no people -9.7, 109
6
GREEN
01 Dec 2017 06:00 Tropical storm 93 km/h (57 mph) km/h ( mph) no people -10.2, 109.6
7
GREEN
01 Dec 2017 12:00 Tropical storm 93 km/h (57 mph) km/h ( mph) no people -10.5, 110.5
8
GREEN
01 Dec 2017 18:00 Tropical storm 102 km/h (63 mph) km/h ( mph) no people -10.9, 110.7
9
GREEN
02 Dec 2017 00:00 Tropical storm 93 km/h (57 mph) km/h ( mph) no people -10.9, 110.8
10
GREEN
02 Dec 2017 06:00 Tropical storm 83 km/h (52 mph) km/h ( mph) no people -10.8, 110.7
11
GREEN
02 Dec 2017 12:00 Tropical storm 65 km/h (40 mph) km/h ( mph) no people -11.2, 112
12
GREEN
02 Dec 2017 18:00 Tropical storm 65 km/h (40 mph) km/h ( mph) no people -11.8, 112.4
13
GREEN
03 Dec 2017 00:00 Tropical storm 65 km/h (40 mph) km/h ( mph) no people -12.5, 112.4
14
GREEN
03 Dec 2017 06:00 Tropical storm 65 km/h (40 mph) km/h ( mph) no people -13.8, 112.4
15
GREEN
03 Dec 2017 12:00 Tropical storm 65 km/h (40 mph) km/h ( mph) no people -14.8, 112.4
16
GREEN
03 Dec 2017 18:00 Tropical storm 65 km/h (40 mph) km/h ( mph) no people -15.9, 112
16
GREEN
04 Dec 2017 06:00 Tropical depression 56 km/h (34 mph) km/h ( mph) no people -17.1, 111.5

Previous advisories

For accessing reports of previous advisories, please click on the advisory number in the table below.

IDAlert ColorDate (UTC)CategoryMaximum sustained
wind speed (km/h)
Population affected
by cyclone winds (>120km/h)
Affected countries
1 30 Nov 2017 00:00 Tropical storm 102 No people affected Christmas Island
2 30 Nov 2017 06:00 Tropical storm 93 No people affected Indonesia, Christmas Island
3 30 Nov 2017 12:00 Tropical storm 102 No people affected Indonesia, Christmas Island, Australia
4 30 Nov 2017 18:00 Tropical storm 102 No people affected Indonesia, Christmas Island, Australia
5 01 Dec 2017 00:00 Tropical storm 102 No people affected Indonesia, Christmas Island
6 01 Dec 2017 06:00 Tropical storm 111 No people affected Indonesia, Christmas Island, Australia
7 01 Dec 2017 12:00 Category 1 120 No people affected Indonesia, Christmas Island, Australia
8 01 Dec 2017 18:00 Category 1 130 No people affected Indonesia, Christmas Island, Australia
9 02 Dec 2017 00:00 Category 1 120 No people affected Indonesia, Christmas Island
10 02 Dec 2017 06:00 Tropical storm 102 No people affected Indonesia, Christmas Island
11 02 Dec 2017 12:00 Tropical storm 74 No people affected Indonesia, Christmas Island
12 02 Dec 2017 18:00 Tropical storm 74 No people affected Indonesia, Christmas Island
13 03 Dec 2017 00:00 Tropical storm 65 No people affected Indonesia, Christmas Island
14 03 Dec 2017 06:00 Tropical storm 65 No people affected Indonesia, Christmas Island
15 03 Dec 2017 12:00 Tropical storm 65 No people affected Indonesia, Christmas Island
16 03 Dec 2017 18:00 Tropical storm 65 No people affected Indonesia, Christmas Island

More information

Data resources

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

About the data

JRC set up an automatic routine that includes the Tropical Cyclone (TC) bulletins produced by the National Oceanic and Atmospheric Administration (NOAA) and the Joint Typhoon Warning Center (JTWC) into a single database, covering all TC basins.

JRC calculates areas affected by high winds (wind buffers at 39, 58 and 74mph). This is done using the maximum reported wind radius (maximum of 4 quadrants) or, in case no wind radii are provided, through a regression analysis based on historical data. JRC also calculates the area affected by storm surge using HyFlux2 (hydrodynamic software).

Sources for data on critical infrastructure are: JRC NUMAS database (nuclear plants), ESRI (hydro dams, 1996), Global Discovery (airports, ports and cities).

Population data is from LandScan 2014.

Disclaimer

While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information. The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.