Overall Red Tropical Cyclone alert for CHANTHU-21 in China, Philippines from 06 Sep 2021 06:00 UTC to 07 Sep 2021 12:00 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

Overall Red alert Tropical Cyclone for CHANTHU-21

in China, Philippines

07 Sep 2021 12 UTC

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Meteorological source:

GDACS JTWC

Impact Single TC

Impact based on all weather systems in the area

Impact

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

Meteorological source	GDACS
Glide number:	TC-2021-000140-PHL
Exposed countries	China, Philippines
Exposed population	5 million in Category 1 or higher
Maximum wind speed	287 km/h
Maximum storm surge	0.7 m (10 Sep 20:00 UTC)
Vulnerability	Medium (China)

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
Current	241 km/h	0.7 m	n.a.	1.5
Overall	287 km/h	0.7 m	n.a.	1.5
Maximum winds, storm surge, rainfall (Current: over the next 72 h, Overall: entire TC track) based on GDACS impact

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Wind

241 km/h Current Max.

Up to 55000 people in Category 1 strength or higher (see SSHS)

Impact Timeline

N°	Date (UTC)	Max Winds (km/h)	Population in Tropical Storm or higher	Population in Cat 1. or higher	Countries
1	06 Sep 2021 06:00	176	1.2 million	No people	Japan, China
2	06 Sep 2021 12:00	176	670 thousand	No people	Japan, China
3	06 Sep 2021 18:00	194	8.7 million	1.7 million	China
4	07 Sep 2021 00:00	194	12.2 million	3.5 million	China
5	07 Sep 2021 06:00	213	27.9 million	5.9 million	China
6	07 Sep 2021 12:00	241	32.3 million	50 thousand	China

Bulletin Timeline

N°	Date (UTC)	Category (SSHS)	Max winds (km/h)	Population in Cat.1 or higher	Population in Tropical Storm or higher	Location (lat, lon)
1	06 Sep 2021 06:00	Tropical depression	46	no people	no people	14, 138.3
2	06 Sep 2021 12:00	Tropical depression	56	no people	no people	14.7, 138.1
3	06 Sep 2021 18:00	Tropical storm	83	no people	no people	15.3, 137.4
4	07 Sep 2021 00:00	Tropical storm	93	no people	no people	15.6, 136.6
5	07 Sep 2021 06:00	Category 1	120	no people	no people	16.1, 135.7
6	07 Sep 2021 12:00	Category 1	130	no people	no people	16.3, 134.6
6	08 Sep 2021 00:00	Category 2	167	no people	no people	16.4, 132.7
6	08 Sep 2021 12:00	Category 3	194	no people	no people	16.7, 130.9
6	09 Sep 2021 00:00	Category 4	213	no people	no people	17.1, 129.1
6	09 Sep 2021 12:00	Category 4	231	no people	49000 people	17.9, 126.9
6	10 Sep 2021 12:00	Category 4	241	44000 people	6.5 million people	20, 122.9
6	11 Sep 2021 12:00	Category 4	213	39000 people	32.3 million people	21.7, 120.6
6	12 Sep 2021 12:00	Category 2	167	no people	no people	23.3, 118.4

Actual track of the current bulletin

The alert for forecast greater than 3 days is limited to Orange level.

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Exposed population - AoIs

Exposed population in the potential affected countries, provinces and populated places

Countries

Country
China

Provinces

Region Province	Country
Taiwan	China

Populated places

Name	Region Province	Country	City class	Population
O-luan-pi	P'ing-tung	Taiwan	City	-
Maobitou	P'ing-tung	Taiwan	City	-
Heng-chjun	P'ing-tung	Taiwan	City	-

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)
Basco	BSO	56	Civ.	Paved	No	4100

Ports

Name	LOCODE	Country
Basco		Philippines

Nuclear plants

Name	Country	Reactors
MAANSHAN	TAIWAN	2

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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.

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StormSurge

0.7 m

The maximum Storm surge height is 0.7m in Ivana, Philippines. This height is estimated for 10 Sep 2021 20:00 UTC .

The JRC has developed an experimental global storm surge model. 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 (22 locations). Calculation based on advisory number 6 of 07 Sep 2021 12:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert	Date (UTC)	Name	Country	Storm surge height (m)
	10 Sep 2021 20:00	Ivana	Philippines	0.7
	10 Sep 2021 20:00	Mahatao	Philippines	0.7
	10 Sep 2021 20:00	Itbud	Philippines	0.7
	10 Sep 2021 20:00	Basco	Philippines	0.7
	10 Sep 2021 21:00	Raile	Philippines	0.7
	10 Sep 2021 21:00	Itbayat	Philippines	0.7
	10 Sep 2021 21:00	Santa Lucia	Philippines	0.7
	10 Sep 2021 20:00	Nakanmuan	Philippines	0.5
	10 Sep 2021 20:00	Sabtang	Philippines	0.5
	10 Sep 2021 20:00	Chavayan	Philippines	0.5
	11 Sep 2021 12:00	Maobitou	Taiwan	0.2
	11 Sep 2021 12:00	Ta-kuang	Taiwan	0.2
	11 Sep 2021 12:00	Kenting	Taiwan	0.2
	11 Sep 2021 12:00	Heng-chjun	Taiwan	0.2
	11 Sep 2021 12:00	O-luan-pi	Taiwan	0.2
	11 Sep 2021 12:00	Hsu-hai	Taiwan	0.1
	11 Sep 2021 12:00	Chiang tzu	Taiwan	0.1
	11 Sep 2021 12:00	Feng-chiang	Taiwan	0.1
	11 Sep 2021 12:00	Kuo-ch'i	Taiwan	0.1
	11 Sep 2021 12:00	She-liao	Taiwan	0.1
	11 Sep 2021 12:00	Che-cheng	Taiwan	0.1
	11 Sep 2021 12:00	Fang-shan	Taiwan	0.1

Disclaimer
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.
The designations employed and the presentation of material on the map do not imply the expression of any opinion whatsoever on the part of the European Union concerning the legal status of any country, territory or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.