Overall Green alert Tropical Cyclone for TWENTYONE-20
in Australia
click on to select bulletin time
GDACS
Impact Single TC
Impact all weather systems in the area
.

Impact

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

Meteorological source GDACS (JTWC)
Exposed countries Australia
Exposed population No people in Category 1 or higher
Maximum wind speed 65 km/h
Maximum storm surge 0.6 m (11 Mar 17:00 UTC)
Vulnerability Low (Australia)

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 65 km/h 0.6 m n.a. 0.5
GDACS Overall 65 km/h 0.6 m n.a. 0.5

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

Wind

65 km/h Current

Up to 1300 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 11 Mar 2020 06:00 65 5 thousand No people Australia
Green 2 11 Mar 2020 12:00 65 6 thousand No people Australia
Green 3 11 Mar 2020 18:00 65 1 thousand No people Australia

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 11 Mar 2020 06:00 Tropical storm 65 no people no people -16.4, 116.9
GREEN
2 11 Mar 2020 12:00 Tropical storm 65 no people no people -17.6, 116.6
GREEN
3 11 Mar 2020 18:00 Tropical storm 65 1300 people no people -18.4, 115.9 Australia
GREEN
3 12 Mar 2020 06:00 Tropical depression 56 no people no people -20.3, 115 Australia
GREEN
3 12 Mar 2020 18:00 Tropical depression 46 no people no people -22, 114.2 Australia
GREEN
3 13 Mar 2020 06:00 Tropical depression 46 no people no people -24, 113.6 Australia
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.



Exposed population

Countries

Country
Australia

Provinces

Region Province Country Population
Western Australia Australia 1.6 million 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)
Barrow Island BWB 8 Civ. Paved Yes 6200

Ports

Name LOCODE Country
Cossack Pioneer AUCOP Coral Sea Islands
Varanus Island AUVAR Coral Sea Islands
Barrow Island AUBWB Coral Sea Islands

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

0.6 m

The maximum Storm surge height is  0.6m in Derby, Australia. This height is estimated for 11 Mar 2020 17:00 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 (18 locations). Calculation based on advisory number 3 of 11 Mar 2020 18:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert Date (UTC) Name Country Storm surge height (m)
11 Mar 2020 17:00 Derby Australia  0.6
12 Mar 2020 02:00 Wickham Australia  0.5
12 Mar 2020 02:00 Point Samson Australia  0.5
12 Mar 2020 02:00 Cossack Australia  0.5
12 Mar 2020 07:00 Mardie Australia  0.4
12 Mar 2020 05:00 Ah Chong I Australia  0.4
12 Mar 2020 20:00 Learmonth Australia  0.4
12 Mar 2020 04:00 East Lewis I Australia  0.4
11 Mar 2020 23:00 Condon Australia  0.4
11 Mar 2020 13:00 Pender Australia  0.4
11 Mar 2020 23:00 Thangoo Australia  0.3
11 Mar 2020 22:00 Broome Australia  0.3
12 Mar 2020 18:00 Exmouth Australia  0.3
11 Mar 2020 14:00 Kollan I Australia  0.3
11 Mar 2020 22:00 Kennedys Cottage Australia  0.3
11 Mar 2020 22:00 Waterbank Australia  0.3
12 Mar 2020 17:00 Glenroy Australia  0.2
13 Mar 2020 03:00 Warroora Australia  0.1