Overall Green alert Tropical Cyclone for SEROJA-21
in Australia, Indonesia

Event summary

Tropical Cyclone SEROJA-21 can have a low humanitarian impact based on the maximum sustained wind speed, exposed population and vulnerability.

GDACS ID TC 1000775
Name SEROJA-21
From - To 04 Apr - 11 Apr
Exposed countries Australia, Indonesia
Exposed population 3 thousand in Category 1 or higher
Maximum wind speed 120 km/h Category 1
Maximum storm surge 1.9 m (11 Apr 11:00 UTC)
Vulnerability Low (Australia)

GDACS Score

For more info on GDACS alert score click here.
Wind Storm surge Rainfall GDACS score
GDACS 120 km/h 1.9 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF 176 km/h 2.1 m 787 mm 0.5
GFS 133 km/h 2.8 m 619 mm 0.5
ECMWF 133 km/h 1.9 m 656 mm 0.5
Beta Version - All weather systems in the area: maximum expected impact (wind, storm surge, rainfall)
Maximum expected impact (wind, storm surge and rainfall) using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
Australia - Tropical Cyclone SEROJA update (ECHO 09 Apr 2021)Fri, 09 Apr 2021 15:34

  • Tropical Cyclone SEROJA is approaching the West Coast of Western Australia, its centre approximately 500 km north-west of North West Cape (north-west of Western Australia) on 9 April at 0:00 UTC, with maximum sustained winds 85 km/h. 
  • SEROJA is expected to make landfall on 11 April close to Kalbarri Town (central West Coast of Western Australia), with maximum sustained winds up to 155 km/h. Residents between Perth and Coral Bay are on high alert.
  • Strong winds, heavy rain and storm surge are forecast for the West Coast of Western Australia, between Lancelin and Coral Bay for the next 24 hours.
  • A severe weather warning is in place for strong winds in North West Cape owing to another Tropical Cyclone ODETTE, located about 1,100 km north-west of North West Cape. 
Timor-Leste, Indonesia, Australia - Tropical Cyclone SEROJA update (ECHO 08 Apr 2021)Thu, 08 Apr 2021 15:27

  • Tropical Cyclone SEROJA continues moving south-west over the Indian Ocean, and on 8 April at 0.00 UTC, its centre was located approximately 580 km north-west of Karratha City (coastal Pilbara Region, Western Australia), with maximum sustained winds of 102 km/h.
  • Meanwhile, the impact across eastern Indonesia and Timor-Leste has increased after the passage of SEROJA. National authorities in Indonesia report 138 fatalities, 61 missing individuals, and up to 1,114 destroyed or damaged houses across East Nusa Tenggara Province. In Timor-Leste, heavy rainfall that started affecting the country since the end of March, resulted in flash floods and landslides. According to UN OCHA, at least 42 people died and up to 9,779 people have been temporarily displaced in Dili capital city.
  • The International Disaster Charter and Copernicus Emergency Management Service have been activated to support the damage assessment across Timor-Leste.
  • SEROJA is forecast to strengthen as it moves south and could make landfall over Peron Peninsula (central Western Australia) on 11 April, with maximum sustained winds up to 205 km/h.
  • From 10 April, heavy rainfall, strong winds and storm surge have been forecast for the West Coast of Western Australia, between Perth and Coral Bay.
Timor-Leste, Indonesia, Australia - Tropical Cyclone SEROJA update (ECHO 07 Apr 2021)Wed, 07 Apr 2021 15:18

  • Tropical Cyclone SEROJA continued south-west, south of eastern Indonesia and Timor-Leste. On 7 April at 0.00 UTC it was located approximately 670 km north-west of Brome Town (northern Western Australia), with maximum sustained winds of 83 km/h.
  • According to national authorities, 128 died in East Nusa Tenggara Province (Indonesia) and 27 in Timor-Leste following its passage. More than 70 people are missing in Indonesia and over 15,400 displaced in both countries.
  • SEROJA is forecast to continue south-west, strengthening before turning south-east and making landfall on 11 April over the central west coast of Western Australia, with maximum sustained winds up to 175 km/h.
  • Very heavy rain, strong winds and storm surge are forecast over the central and southern coast of Western Australia on 10-12 April.
  • The European Commission's Copernicus emergency satelite mapping service was activated on 4 April to support the damage assessment in Timor-Leste. 2 maps have been produced so far.
Timor-Leste, Indonesia, Australia - Tropical Cyclone SEROJA (ECHO 06 Apr 2021)Tue, 06 Apr 2021 15:15

  • Tropical Cyclone SEROJA formed over the Savu Sea (eastern Indonesia, bordering Timor-Leste) on 4 April, moving south-west towards the Western Australia coast. On 6 April at 0.00 UTC its centre was approx. 130 km south of Sumba Island (East Nusa Tenggara) and 730 km nort-west of Derby Town (Western Australia), with maximum sustained winds of 102 km/h.
  • Following its passage, the Indonesian National Board for Disaster Management reports 128 fatalities, 72 people missing and 8,424 people displaced in East Nusa Tenggara. The Government of Timor-Leste reports 27 fatalities and 7,000 displaced in Dili.
  • SEROJA is forecast to strengthen as it moves south-west, with winds up to 195 km/h possible on 10 April.
  • Very heavy rain, strong winds and storm surge are forecast over East Nusa Tenggara Province on 6-7 April, and the central coast of Western Australia on 10-11 April. Moderate rain is forecast over Timor-Leste on 6 April.
  • The European Commission's Copernicus emergency satelite mapping service was activated on 4 April to support damage assessments around Dili.
Detailed event map. European Union, 2021. 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)

Latest media headlines

Articles: 223 | About casualties: 43 | Last hour: 0

Java quake kills seven IndonesiansSun, 11 Apr 2021 05:59:00 +0200.

A damaged house affected by an earthquake of magnitude 5.9 struck in the ocean 91 km (57 miles) south-southeast of Blitar, is pictured in Malang, East Java province, Indonesia April 10, 2021, in this photo taken by Antara Foto/via Reuters.
...(more)
Le bilan du cyclone tropical Seroja en Indonésie est passé à 174 mortsSun, 11 Apr 2021 04:11:00 +0200.

(Xinhua/Bayu Novanta) JAKARTA, 10 avril (Xinhua) -- Selon l'Agence nationale de gestion des catastrophes, le bilan du cyclone tropical Seroja dans la province indonésienne de Nusa Tenggara oriental (centre) est passé à 174 morts samedi. "Le
...(more)
Indonesia's Java hit by magnitude 5.9 quake, at least 7 killedSun, 11 Apr 2021 02:38:00 +0200.

A damaged house affected by an earthquake of magnitude 5.9 struck in the ocean 91 km (57 miles) south-southeast of Blitar, is pictured in Malang, East Java province, Indonesia April 10, 2021, in this photo taken by Antara Foto/via Reuters.
...(more)
5.9-magnitude earthquake kills seven in IndonesiaSun, 11 Apr 2021 00:44:00 +0200.

Seven people were killed, two severely injured, and hundreds of buildings were damaged in several cities as an earthquake measuring 5.9 on the Richter scale struck off Indonesia’s Java island on Saturday, the country’s disaster mitigation a
...(more)

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), (1), WMO (1), INFORM (2),