Overall Green alert Tropical Cyclone for WASI-20
in Samoa, Niue

Impact

Tropical Cyclone WASI-20 can have a low humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source GDACS (JTWC)
Exposed countries Samoa, Niue
Exposed population No people in Category 1 or higher
Maximum wind speed 102 km/h
Maximum storm surge 0.2 m (23 Feb 20:00 UTC)
Vulnerability Medium (Samoa)

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 46 km/h n.a. n.a. 0.5
GDACS Overall 102 km/h 0.2 m n.a. 0.5

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

Wind

46 km/h Current

Up to 110000 people in Tropical storm (see SSHS)

Impact Timeline

Alert Date (UTC) Max Winds (km/h) Population in
Tropical Storm
Population in
Cat. 1 or higher
Countries
Green 1 21 Feb 2020 12:00 83 200 thousand No people Samoa
Green 2 21 Feb 2020 18:00 74 10 thousand No people Samoa
Green 3 22 Feb 2020 00:00 102 200 thousand No people Samoa, Niue
Green 4 22 Feb 2020 06:00 120 190 thousand No people Samoa, Niue
Green 5 22 Feb 2020 12:00 111 120 thousand No people Samoa, Niue
Green 6 22 Feb 2020 18:00 93 120 thousand No people Samoa, Niue
Green 7 23 Feb 2020 00:00 83 120 thousand No people Samoa, Niue
Green 8 23 Feb 2020 06:00 74 120 thousand No people Niue, Samoa
Green 9 23 Feb 2020 12:00 46 120 thousand No people Samoa

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 21 Feb 2020 12:00 Tropical depression 56 no people no people -12.7, -175.2
GREEN
2 21 Feb 2020 18:00 Tropical depression 56 13000 people no people -13.2, -174.3 Samoa
GREEN
3 22 Feb 2020 00:00 Tropical storm 83 190000 people no people -13.4, -173.3 Samoa
GREEN
4 22 Feb 2020 06:00 Tropical storm 102 180000 people no people -14, -172.7 Samoa
GREEN
5 22 Feb 2020 12:00 Tropical storm 83 58000 people no people -14.5, -172.2 Samoa
GREEN
6 22 Feb 2020 18:00 Tropical storm 83 no people no people -15.1, -172
GREEN
7 23 Feb 2020 00:00 Tropical storm 74 no people no people -16.2, -171.4
GREEN
8 23 Feb 2020 06:00 Tropical storm 74 1100 people no people -17, -171 Niue
GREEN
9 23 Feb 2020 12:00 Tropical depression 46 no people no people -17.2, -171
GREEN
9 24 Feb 2020 00:00 Tropical depression 37 no people no people -18.8, -170.5 Niue
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.



Exposed population

Countries

Country
Samoa

Provinces

Region Province Country Population
Samoa Samoa 150000 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)
Lalomalava LAV unknown 0
Faleolo APW 18 Civ. Paved Yes 8800
Maota MXS unknown 0

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

0.2 m

The maximum Storm surge height is  0.2m in Alofi, Niue. This height is estimated for 23 Feb 2020 20:00 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 (20 locations). Calculation based on advisory number 8 of 23 Feb 2020 06:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert Date (UTC) Name Country Storm surge height (m)
23 Feb 2020 20:00 Alofi Niue  0.2
23 Feb 2020 20:00 Avatele Niue  0.2
22 Feb 2020 02:00 Falealupo Samoa  0.1
22 Feb 2020 04:00 Falelima Samoa  0.1
22 Feb 2020 04:00 Leagiaga Samoa  0.1
22 Feb 2020 07:00 Gautavai Samoa  0.1
22 Feb 2020 07:00 Satupaitea Samoa  0.1
22 Feb 2020 08:00 Salelologa Samoa  0.1
23 Feb 2020 20:00 Mutalau Niue  0.1
23 Feb 2020 20:00 Lakepa Niue  0.1
23 Feb 2020 20:00 Hakupu Niue  0.1
22 Feb 2020 09:00 Samatau Samoa  0.1
22 Feb 2020 09:00 Fuailalo Samoa  0.1
22 Feb 2020 05:00 Salailua Samoa  0.1
22 Feb 2020 10:00 Faleaseela Samoa  0.1
22 Feb 2020 10:00 Matautu Samoa  0.1
23 Feb 2020 20:00 Liku Niue  0.1
22 Feb 2020 05:00 Fagamalo Samoa  0.1
22 Feb 2020 01:00 Sasina Samoa  0.1
22 Feb 2020 07:00 Tuasivi Samoa  0.1