Overall Green alert Tropical Cyclone for ASTANI-20
in China, Philippines, Viet Nam, Cambodia, Laos,

Event summary

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

GDACS ID TC 1000737
Name ASTANI-20
From - To 29 Oct - 07 Nov
Exposed countries China, Philippines, Viet Nam, Cambodia, Laos,
Exposed population No people in Category 1 or higher
Maximum wind speed 102 km/h Tropical storm
Maximum storm surge 0.6 m (07 Nov 04:00 UTC)
Vulnerability Medium (China)

GDACS Score

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Wind Storm surge Rainfall GDACS score
GDACS JTWC 46 km/h 0.6 m n.a. 0.5
Single TC: maximum expected impact (wind, storm surge, rainfall)
HWRF n.a n.a. n.a. n.a.
GFS 364 km/h 1.6 m 609 mm 2.5
ECMWF 187 km/h 2 m 717 mm 2.5
Maximum expected impact (wind, storm surge and rainfall) using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
Philippines - Tropical Storm ASTANI (ECHO 03 Nov 2020)Tue, 03 Nov 2020 11:13

  • The new Tropical Storm ASTANI (locally known as SIONY) is moving west over the Philippine Sea and on 3 November, its center was located approximately 570 km east of Balintang Islands (Luzon Strait), with maximum sustained wind of 65 km/h. 
  • ASTANI is forecast to strengthen as it moves west over the Philippine Sea. It could reach the Balintang, Batanes, and Babuyan Islands in the Luzon Strait on 5 November, as a Tropical Storm. National authorities in the Philippines started preparedness measures ahead of Tropical Storm ASTANI.
  • Moderate to heavy rain is forecast over Batanes and northern Luzon Provinces 3-4 November.
Philippines - Tropical Storm ASTANI Wed, 04 Nov 2020 11:03

  • Tropical Storm ASTANI (named SIONY in the Philippines) is moving west over the Philippine Sea towards Luzon Strait. On 4 November at 00.00 UTC, its centre was located approximately 800 km north-east of Santa Ana Municipality (Cagayan Province, northern Philippines), with maximum sustained wind of 65 km/h.
  • ASTANI is forecast to continue moving west and to approach Batanes, Babuyan Islands and northern Luzon on 5-6 November, strengthening with maximum sustained winds of 100-110 km/h. It will cross the northern Philippines, 650 km of GONI's track that made landfall over southern Luzon on 31 October.
  • National Authorities issued a red alert status for Batanes Islands and Cagayan Province.
  • For the next 24 hours, heavy rain, strong winds and storm surge are forecast over northern Luzon (particularly the Provinces of Cagayan and Ilocos Norte), Batanes and Babuyan Islands.
  • According to PAGASA, a tropical storm signal 1 warning is in effect for Cagayan Valley Region.
Philippines, Taiwan - Tropical Cyclone ASTANI update (ECHO 05 Nov 2020)Thu, 05 Nov 2020 11:09

  • Tropical Cyclone ASTANI (named Siony in the Philippines) continued  over the western Philippine Sea toward the Luzon Strait on 4 November, as a Tropical Storm.
  • On 5 November, its center was located approximately 500 km east of Itbayat Island (Batanes Islands, the northernmost part of the Philippines), and approximately 620 km south-east of southern coast of Taiwan, with maximum sustained winds of 102 km/h.
  • ASTANI is forecast to continue westward over the Philippine Sea and it is expected to reach the Batanes Islands in the very early morning (UTC) of 6 November, as a Typhoon. After that, it is expected to continue over the northern South China Sea on 6-7 November, remaining a Typhoon.
  • On 6-8 November, heavy rainfall, strong wind and storm surge are forecast over Babuyan, Batanes Islands, and the Cagayan Province (northern Luzon). PAGASA has issued a Tropical Cyclone Wind Signal no. 1 over the area.
  • Heavy rainfall is forecast also over southern Taiwan for the same period.
Philippines, Taiwan - Tropical Storm ASTANI update Fri, 06 Nov 2020 11:04

  • Tropical Storm ASTANI (Siony in the Philippines) is crossing the Batanes Islands (northern Philippines). On 6 November at 0.00 UTC, its centre was located over southern Itbayat Island (Batanes Islands), with maximum sustained winds of 83 km/h.
  • ASTANI is forecast to move west-northwestward and pass off the southern coast of Taiwan within 12 hours. Afterwards, it will turn southwestward over the north-eastern South China Sea on 7 November.
  • On 6-7 November, heavy rainfall, strong wind and storm surge are forecast over Babuyan, Batanes Islands, northern Luzon, eastern and southern Taiwan.
  • PAGASA has issued a Tropical Cyclone Wind Signal no. 2 over Cagayan Valley Region (northern Luzon).
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)

Latest media headlines

Articles: 3 | About casualties: 0 | Last hour: 0

Philippines, Taiwan - Tropical Cyclone ASTANI update (GDACS, JTWC, PAG ... Thu, 05 Nov 2020 14:31:00 +0100.

Tropical Cyclone ASTANI (named Siony in the Philippines) continued over the western Philippine Sea toward the Luzon Strait on 4 November, as a Tropical Storm. On 5 November, its center was located approximately 500 km east of Itbayat Island
...(more)
Typhoon ‘Rolly’ to be closest to Central Luzon, Metro Manila on Sunday ... Sat, 31 Oct 2020 05:13:00 +0100.

MANILA, Philippines — The latest forecast track of Typhoon “Rolly” shows that it would move over Central Luzon — close to Metro Manila — between Sunday night and Monday morning, state meteorologists said. According to the weather report fro
...(more)
Even before ‘Rolly’ hits PH landmass, Pagasa already monitoring next s ... Fri, 30 Oct 2020 05:17:00 +0100.

According to Pagasa’s severe weather bulletin on Thursday night, the tropical depression east of Mindanao has already intensified into a tropical storm, and was given the international name “Astani”. Once it enters PAR, it would be given th
...(more)

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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),