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Overall Red alert Tropical Cyclone for GITA-18
in Tongafrom 09 Feb 2018 00:00 UTC to 14 Feb 2018 06:00 UTC
Automatic impact report for tropical cyclone GITA-18
alertimage

Current Green alert for wind impact in Tonga as of 14 Feb 2018 06:00:00 UTC

This tropical cyclone is expected to have a high 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 40 of tropical cyclone GITA-18 issued at 18 Feb 2018 18:00 UTC (GDACS Event ID 1000436, Latest episode ID: 40, inserted at 14 Feb 2018 07:52 UTC ).

Current impact estimate:

  • Population affected by Category 1 (120 km/h) wind speeds or higher is 82817
  • Tropical Storm (maximum wind speed of 231 km/h)
  • Vulnerability of affected countries: Medium

Impact of Extreme Wind

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  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  
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 83000 people people can be affected by wind speeds of cyclone strength or above. In addition, no people people are living in coastal areas below 5m and can therefore be affected by storm surge.

Affected country

Country
Tonga

Affected provinces

Region Province Country Population
Tonga Tonga 98000 people

Affected Populated Places (first 20 records)

Name Region Province Country City class Population Distance
Nuku'alofa Tonga Capital 24000 people 808 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
Ono-I-Lau ONU unknown 0 453 km
Fua'amotu International TBU 38 Civ. Paved Yes 8700 815 km
Eua Kaufana EUA unknown 0 834 km
Major ports
Name LOCODE Country Distance
Hunter Island New Caledonia 525 km
Matthew Island New Caledonia 596 km
Nuku'alofa TOTBU Tonga 810 km
Eua Island Tonga 839 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
09 Feb 2018 00:00 Tropical storm 74 km/h (46 mph) km/h ( mph) no people -13.8, -175.5
2
GREEN
09 Feb 2018 06:00 Tropical storm 74 km/h (46 mph) km/h ( mph) no people -14.3, -174.5
3
GREEN
09 Feb 2018 12:00 Tropical storm 83 km/h (52 mph) km/h ( mph) no people -14.5, -173
4
GREEN
09 Feb 2018 18:00 Tropical storm 83 km/h (52 mph) km/h ( mph) no people -15.3, -171.4
5
GREEN
10 Feb 2018 00:00 Tropical storm 93 km/h (57 mph) km/h ( mph) no people -16.1, -170
6
GREEN
10 Feb 2018 06:00 Tropical storm 93 km/h (57 mph) km/h ( mph) no people -17, -169
7
GREEN
10 Feb 2018 12:00 Tropical storm 102 km/h (63 mph) km/h ( mph) no people -18.2, -168.5
8
GREEN
10 Feb 2018 18:00 Category 1 139 km/h (86 mph) km/h ( mph) no people -18.9, -168.6
9
GREEN
11 Feb 2018 00:00 Category 2 157 km/h (98 mph) km/h ( mph) no people -20.5, -168.3
10
GREEN
11 Feb 2018 06:00 Category 2 167 km/h (103 mph) km/h ( mph) no people -20.9, -168.9
11
GREEN
11 Feb 2018 12:00 Category 2 167 km/h (103 mph) km/h ( mph) no people -21.4, -170.2
12
GREEN
11 Feb 2018 18:00 Category 2 176 km/h (109 mph) km/h ( mph) no people -21.7, -171.5
13
RED
12 Feb 2018 00:00 Category 3 204 km/h (126 mph) km/h ( mph) 82000 people -21.8, -172.6
14
RED
12 Feb 2018 06:00 Category 4 231 km/h (143 mph) km/h ( mph) 82000 people -21.8, -174.3
15
RED
12 Feb 2018 12:00 Category 4 231 km/h (143 mph) km/h ( mph) 83000 people -21.5, -175.5
16
GREEN
12 Feb 2018 18:00 Category 4 231 km/h (143 mph) km/h ( mph) <1000 people -21.3, -177.1
17
GREEN
13 Feb 2018 00:00 Category 4 222 km/h (138 mph) km/h ( mph) <1000 people -21.2, -178.4
18
GREEN
13 Feb 2018 06:00 Category 4 213 km/h (132 mph) km/h ( mph) <1000 people -21, -179.5
19
GREEN
13 Feb 2018 12:00 Category 3 204 km/h (126 mph) km/h ( mph) no people -21.1, 179.5
20
GREEN
13 Feb 2018 18:00 Category 3 204 km/h (126 mph) km/h ( mph) no people -21, 178.6
21
GREEN
14 Feb 2018 00:00 Category 4 213 km/h (132 mph) km/h ( mph) no people -21.1, 177.7
22
GREEN
14 Feb 2018 06:00 Category 4 213 km/h (132 mph) km/h ( mph) no people -21.3, 177
22
GREEN
14 Feb 2018 18:00 Category 3 204 km/h (126 mph) km/h ( mph) no people -21.6, 175.3
22
GREEN
15 Feb 2018 06:00 Category 3 194 km/h (120 mph) km/h ( mph) <1000 people -22, 173.4
22
GREEN
15 Feb 2018 18:00 Category 3 185 km/h (115 mph) km/h ( mph) <1000 people -22.6, 171.5
22
GREEN
16 Feb 2018 06:00 Category 2 176 km/h (109 mph) km/h ( mph) no people -23.5, 169.4
22
GREEN
17 Feb 2018 06:00 Category 1 139 km/h (86 mph) km/h ( mph) no people -26, 166.2
22
GREEN
18 Feb 2018 06:00 Category 1 120 km/h (75 mph) km/h ( mph) no people -29.4, 164.3
22
GREEN
19 Feb 2018 06:00 Tropical storm 102 km/h (63 mph) km/h ( mph) no people -33.3, 165.7

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 09 Feb 2018 00:00 Category 1 120 80 thousand Tonga
2 09 Feb 2018 06:00 Category 1 148 80 thousand Tonga
3 09 Feb 2018 12:00 Category 1 148 80 thousand Tonga
4 09 Feb 2018 18:00 Category 1 139 80 thousand Tonga
5 10 Feb 2018 00:00 Category 1 139 80 thousand Tonga
6 10 Feb 2018 06:00 Category 1 139 80 thousand Tonga
7 10 Feb 2018 12:00 Category 1 130 80 thousand Tonga
8 10 Feb 2018 18:00 Category 2 176 80 thousand Tonga
9 11 Feb 2018 00:00 Category 3 204 Few people affected Niue, Tonga, American Samoa, Wallis and Futuna, Fiji
10 11 Feb 2018 06:00 Category 3 185 80 thousand Tonga
11 11 Feb 2018 12:00 Category 3 185 80 thousand Tonga
12 11 Feb 2018 18:00 Category 3 185 80 thousand Tonga
13 12 Feb 2018 00:00 Category 4 213 80 thousand Tonga
14 12 Feb 2018 06:00 Category 4 231 80 thousand Tonga
15 12 Feb 2018 12:00 Category 4 231 80 thousand Tonga
16 12 Feb 2018 18:00 Category 4 231 80 thousand Tonga
17 13 Feb 2018 00:00 Category 4 222 80 thousand Tonga
18 13 Feb 2018 06:00 Category 4 213 80 thousand Tonga
19 13 Feb 2018 12:00 Category 3 204 80 thousand Tonga
20 13 Feb 2018 18:00 Category 3 204 80 thousand Tonga
21 14 Feb 2018 00:00 Category 4 213 80 thousand Tonga
22 14 Feb 2018 06:00 Category 4 213 80 thousand Tonga
23 14 Feb 2018 12:00 Category 4 213 80 thousand Tonga
24 14 Feb 2018 18:00 Category 3 194 80 thousand Tonga
25 15 Feb 2018 00:00 Category 3 194 80 thousand Tonga
26 15 Feb 2018 06:00 Category 3 194 80 thousand Tonga
27 15 Feb 2018 12:00 Category 3 185 80 thousand Tonga
28 15 Feb 2018 18:00 Category 3 185 80 thousand Tonga
29 16 Feb 2018 00:00 Category 2 176 80 thousand Tonga
30 16 Feb 2018 06:00 Category 2 167 80 thousand Tonga
31 16 Feb 2018 12:00 Category 1 148 80 thousand Tonga
32 16 Feb 2018 18:00 Category 1 139 80 thousand Tonga
33 17 Feb 2018 00:00 Category 1 130 80 thousand Tonga
34 17 Feb 2018 06:00 Category 1 120 80 thousand Tonga
35 17 Feb 2018 12:00 Tropical storm 111 80 thousand Tonga
36 17 Feb 2018 18:00 Tropical storm 111 80 thousand Tonga
37 18 Feb 2018 00:00 Tropical storm 102 80 thousand Tonga
38 18 Feb 2018 06:00 Tropical storm 93 80 thousand Tonga
39 18 Feb 2018 12:00 Tropical storm 93 80 thousand Tonga
40 18 Feb 2018 18:00 Tropical storm 93 80 thousand Tonga

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.