Overall Green alert Tropical Cyclone for THREE-20
in Australia

Event summary

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

GDACS ID TC 1000750
Name THREE-20
From - To 08 Dec - 11 Dec
Exposed countries Australia
Exposed population No people in Category 1 or higher
Maximum wind speed 83 km/h Tropical storm
Maximum storm surge 0.8 m (11 Dec 06:00 UTC)
Vulnerability Low (Australia)

GDACS Score

For more info on GDACS alert score click here.
Wind Storm surge Rainfall GDACS score
GDACS JTWC 65 km/h 0.8 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF 90 km/h 0.9 m 534 mm 0.5
GFS 104 km/h 1 m 365 mm 0.5
ECMWF 76 km/h 1.4 m 442 mm 0.5
Maximum expected impact (wind, storm surge and rainfall) using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
Australia - Tropical Cyclone THREE (ECHO 09 Dec 2020)Wed, 09 Dec 2020 11:00

  • A new tropical cyclone named THREE formed over the eastern Indian Ocean - east of Christmas Island (Australia), south of Java Island - on 8 December and started moving south-east toward Western Australia. On 9 December at 0.00 UTC its centre was located offshore approximately 1,400 km north-west of the northwestern coast of Western Australia, with maximum sustained wind of 83 km/h (tropical storm).
  • THREE is forecast to continue south-east over the Ocean and it is expected to reach the eastern Pilbara, and western Kimberley regions (northwestern of Western Australia) on the evening (UTC) of 11 December, as a tropical storm.
  • Heavy rainfall is forecast over Pilbara, and Kimberley regions on 11-12 December.
Australia - Tropical cyclone THREE update (ECHO 10 Dec 2020)Thu, 10 Dec 2020 10:58

  • Tropical cyclone THREE continued south-east over the eastern Indian Ocean toward Western Australia, as a tropical storm. On 10 December, its centre was located offshore approximately 1,000 km north-west of northern coast of Pilbara Region, with maximum sustained wind of 65 km/h (tropical storm).
  • THREE is forecast to continue south-east over the Ocean and it is expected to make landfall very close to Port Hedland Town (Pilbara, near to western Kimberley Region) on the morning (UTC) of 11 December, as a tropical storm.
  • Heavy rainfall and strong wind are forecast over Pilbara, and Kimberley on 11-12 December. The Australian Bureau of Meteorology (BOM) has issued a severe weather and a flood warning over northern Pilbara and the adjacent western Kimberley.
Australia - Tropical cyclone THREE-20 (ECHO 11 Dec 2020)Fri, 11 Dec 2020 02:00

  • Tropical cyclone THREE-20 made landfall in the early morning of 11 December over coastal central Pilbara Region (Western Australia), in an area between Port Hedland and Wickham City, with maximum sustained wind up to 75 km/h.
  • On 11 December at 6.00 UTC, its centre was located 30 km east of Wodgina mining settlement (eastern Pilbara Region), with maximum sustained wind of 65 km/h. Tropical cyclone THREE-20 is forecast to weaken as it moves further inland, dissipating in the late afternoon of 11 December.
  • Severe weather warnings for strong wind and heavy rainfall have been issused for northern and central Pilbara, south-western Kimberly, and western North Interior Regions. A major flood warning due to heavy rainfall has been issued for De Grey River (Pilbara Region).
Detailed event map. European Union, 2024. Map produced by EC-JRC.
The boundaries and the names shown on this map do not imply official endorsement or acceptance by the European Union.

Updates on volcanic activity (Smithsonian)

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Estimated casualties (PAGER)

USGS estimates the number of casualties for each earthquake for the Prompt Assessment of Global Earthquakes for Response (PAGER) product.
The graph shows the current fatalities estimate.

Exposed population

Data, images, links, services and documents

For this events, GDACS has links to information from the following sources: EC-JRC (38), (2), WMO (1), INFORM (2),