Overall Red alert Tropical Cyclone for GITA-18
in Tonga

Impact

Tropical Cyclone GITA-18 can have a high humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source GDACS (JTWC)
Exposed countries Tonga
Exposed population 80 thousand in Category 1 or higher
Maximum wind speed 231 km/h
Maximum storm surge 1.6 m (20 Feb 12:00 UTC)
Vulnerability Medium (Tonga)

GDACS Score

GDACS alert score for Tropical Cyclones is 0.5 (GREEN Alert), 1.5 (ORANGE Alert), 2.5 (RED Alert)
For more info on GDACS alert score click here.
  Wind Storm surge Rainfall GDACS score
GDACS Current 120 km/h n.a. n.a. 0.5
GDACS Overall 231 km/h 1.6 m n.a. 2.5

Maximum winds, storm surge, rainfall (Current: over the next 72 h, Overall: entire TC track)

Wind

120 km/h Current

Up to 83000 people in Category 1 strength or higher (see SSHS)

Impact Timeline

Alert Date (UTC) Max Winds (km/h) Population in
Tropical Storm
Population in
Cat. 1 or higher
Countries
Orange 1 09 Feb 2018 00:00 120 390 thousand 80 thousand Tonga
Orange 2 09 Feb 2018 06:00 148 400 thousand 80 thousand Tonga
Orange 3 09 Feb 2018 12:00 148 930 thousand 80 thousand Tonga
Orange 4 09 Feb 2018 18:00 139 830 thousand 80 thousand Tonga
Orange 5 10 Feb 2018 00:00 139 820 thousand 80 thousand Tonga
Orange 6 10 Feb 2018 06:00 139 600 thousand 80 thousand Tonga
Orange 7 10 Feb 2018 12:00 130 670 thousand 80 thousand Tonga
Orange 8 10 Feb 2018 18:00 176 770 thousand 80 thousand Tonga
Green 9 11 Feb 2018 00:00 204 390 thousand Few people Niue, Tonga, American Samoa, Wallis and Futuna, Fiji
Red 10 11 Feb 2018 06:00 185 1.1 million 80 thousand Tonga
Red 11 11 Feb 2018 12:00 185 980 thousand 80 thousand Tonga
Red 12 11 Feb 2018 18:00 185 1.1 million 80 thousand Tonga
Red 13 12 Feb 2018 00:00 213 790 thousand 80 thousand Tonga
Red 14 12 Feb 2018 06:00 231 540 thousand 80 thousand Tonga
Red 15 12 Feb 2018 12:00 231 360 thousand 80 thousand Tonga
Green 16 12 Feb 2018 18:00 231 970 thousand 80 thousand Tonga
Green 17 13 Feb 2018 00:00 222 800 thousand 80 thousand Tonga
Green 18 13 Feb 2018 06:00 213 740 thousand 80 thousand Tonga
Green 19 13 Feb 2018 12:00 204 390 thousand 80 thousand Tonga
Green 20 13 Feb 2018 18:00 204 540 thousand 80 thousand Tonga
Green 21 14 Feb 2018 00:00 213 580 thousand 80 thousand Tonga
Green 22 14 Feb 2018 06:00 213 560 thousand 80 thousand Tonga
Green 23 14 Feb 2018 12:00 213 550 thousand 80 thousand Tonga
Green 24 14 Feb 2018 18:00 194 1.2 million 80 thousand Tonga
Green 25 15 Feb 2018 00:00 194 4 million 80 thousand Tonga
Green 26 15 Feb 2018 06:00 194 4.6 million 80 thousand Tonga
Green 27 15 Feb 2018 12:00 185 4.6 million 80 thousand Tonga
Green 28 15 Feb 2018 18:00 185 4.6 million 80 thousand Tonga
Green 29 16 Feb 2018 00:00 176 4.2 million 80 thousand Tonga
Green 30 16 Feb 2018 06:00 167 4.5 million 80 thousand Tonga
Green 31 16 Feb 2018 12:00 148 4.6 million 80 thousand Tonga
Green 32 16 Feb 2018 18:00 139 4.7 million 80 thousand Tonga
Green 33 17 Feb 2018 00:00 130 2.2 million 80 thousand Tonga
Green 34 17 Feb 2018 06:00 120 4.2 million 80 thousand Tonga

Bulletin Timeline

Alert Date (UTC) Category Max winds
(km/h)
Population in
Tropical Storm
Population in
Cat.1 or higher
Location (lat, lon) Countries
GREEN
1 09 Feb 2018 00:00 Tropical storm 74 260000 people no people -13.8, -175.5 American Samoa
GREEN
2 09 Feb 2018 06:00 Tropical storm 74 260000 people no people -14.3, -174.5 Niue
GREEN
3 09 Feb 2018 12:00 Tropical storm 83 250000 people no people -14.5, -173 Niue
GREEN
4 09 Feb 2018 18:00 Tropical storm 83 250000 people no people -15.3, -171.4 Niue
GREEN
5 10 Feb 2018 00:00 Tropical storm 93 200000 people no people -16.1, -170 Niue
GREEN
6 10 Feb 2018 06:00 Tropical storm 93 1100 people no people -17, -169 Niue
GREEN
7 10 Feb 2018 12:00 Tropical storm 102 1100 people no people -18.2, -168.5 Niue
GREEN
8 10 Feb 2018 18:00 Category 1 139 1100 people no people -18.9, -168.6 Niue
GREEN
9 11 Feb 2018 00:00 Category 2 157 1100 people no people -20.5, -168.3 Niue
GREEN
10 11 Feb 2018 06:00 Category 2 167 6200 people no people -20.9, -168.9 Niue
GREEN
11 11 Feb 2018 12:00 Category 2 167 100000 people no people -21.4, -170.2 Niue
GREEN
12 11 Feb 2018 18:00 Category 2 176 100000 people no people -21.7, -171.5 Tonga
RED
13 12 Feb 2018 00:00 Category 3 204 100000 people 82000 people -21.8, -172.6 Tonga
RED
14 12 Feb 2018 06:00 Category 4 231 90000 people 82000 people -21.8, -174.3 Tonga
RED
15 12 Feb 2018 12:00 Category 4 231 84000 people 83000 people -21.5, -175.5 Tonga
GREEN
16 12 Feb 2018 18:00 Category 4 231 100000 people <1000 people -21.3, -177.1 Fiji
GREEN
17 13 Feb 2018 00:00 Category 4 222 80000 people <1000 people -21.2, -178.4 Fiji
GREEN
18 13 Feb 2018 06:00 Category 4 213 340000 people <1000 people -21, -179.5 Fiji
GREEN
19 13 Feb 2018 12:00 Category 3 204 20000 people no people -21.1, 179.5 Fiji
GREEN
20 13 Feb 2018 18:00 Category 3 204 12000 people no people -21, 178.6 Fiji
GREEN
21 14 Feb 2018 00:00 Category 4 213 13000 people no people -21.1, 177.7 Fiji
GREEN
22 14 Feb 2018 06:00 Category 4 213 10000 people no people -21.3, 177 Fiji
GREEN
23 14 Feb 2018 12:00 Category 4 213 <1000 people no people -21.5, 176
GREEN
24 14 Feb 2018 18:00 Category 3 194 <1000 people no people -21.5, 175.3
GREEN
25 15 Feb 2018 00:00 Category 3 194 <1000 people no people -21.5, 174.2 Vanuatu
GREEN
26 15 Feb 2018 06:00 Category 3 194 <1000 people <1000 people -21.8, 173.4
GREEN
27 15 Feb 2018 12:00 Category 3 185 8800 people <1000 people -22.3, 172.2 New Caledonia
GREEN
28 15 Feb 2018 18:00 Category 3 185 170000 people <1000 people -22.6, 171.2 New Caledonia
GREEN
29 16 Feb 2018 00:00 Category 2 176 200000 people no people -22.8, 170 Vanuatu
GREEN
30 16 Feb 2018 06:00 Category 2 167 210000 people no people -23.2, 169 Vanuatu
GREEN
31 16 Feb 2018 12:00 Category 1 148 210000 people no people -23.5, 168 New Caledonia
GREEN
32 16 Feb 2018 18:00 Category 1 139 200000 people no people -23.8, 167.3 New Caledonia
GREEN
33 17 Feb 2018 00:00 Category 1 130 180000 people no people -24.5, 166.4 New Caledonia
GREEN
34 17 Feb 2018 06:00 Category 1 120 90000 people no people -24.9, 165.6 New Caledonia
GREEN
34 17 Feb 2018 18:00 Tropical storm 111 no people no people -25.9, 163.8
GREEN
34 18 Feb 2018 06:00 Tropical storm 102 no people no people -27.5, 162.5
GREEN
34 18 Feb 2018 18:00 Tropical storm 93 <1000 people no people -29.5, 162
GREEN
34 19 Feb 2018 06:00 Tropical storm 93 660000 people no people -32.4, 163.3 New Zealand
GREEN
34 20 Feb 2018 06:00 Tropical storm 93 3.6 million people no people -39.3, 169.6 New Zealand
GREEN
34 21 Feb 2018 06:00 Tropical storm 83 no people no people -43.3, 174.8
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.



Exposed population

Countries

Country
Tonga

Provinces

Region Province Country Population
Tonga Tonga 98000 people

Populated places

Name Region Province Country City class Population
Nuku'alofa Tonga Capital 24000 people

Critical infrastructure

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

Airports

Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft)
Ono-I-Lau ONU unknown 0
Fua'amotu International TBU 38 Civ. Paved Yes 8700
Eua Kaufana EUA unknown 0

Ports

Name LOCODE Country
Matthew Island New Caledonia
Hunter Island New Caledonia
Nuku'alofa TOTBU Tonga
Eua Island Tonga

Rainfall

Rainfall accumulation of the past 24h, as detected by the Global Precipitation Measurement mission of NASA. For more information, see https://www.nasa.gov/mission_pages/GPM/main/index.html.

...

StormSurge

1.6 m

The maximum Storm surge height is  1.6m in Tahunanui, New Zealand. This height is estimated for 20 Feb 2018 12:00 UTC .

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. All links, data, statistics and maps refer to the latest available calculation. If the calculation for the last advisory is not completed, the latest available calculation is shown.

Locations affected by Storm surge (338 locations). Calculation based on advisory number 44 of 19 Feb 2018 18:00:00 UTC. (Simulation using 0.5 minute resolution)

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