Overall Red alert Tropical Cyclone for CHANTHU-21
in China, Philippines

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 0.2 m (11 Sep 03:00 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 213 km/h 0.2 m n.a. 1.5
Overall 287 km/h 0.2 m n.a. 1.5

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

Wind

213 km/h Current Max.

Up to 5.9 million people in Category 1 strength or higher (see SSHS)

Impact Timeline

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

Bulletin Timeline

Alert Date (UTC) Category
(SSHS)
Max winds
(km/h)
Population in
Tropical Storm
or higher
Population in
Cat.1 or higher
Location (lat, lon) Countries
GREEN
1 06 Sep 2021 06:00 Tropical depression 46 no people no people 14, 138.3
GREEN
2 06 Sep 2021 12:00 Tropical depression 56 no people no people 14.7, 138.1
GREEN
3 06 Sep 2021 18:00 Tropical storm 83 no people no people 15.3, 137.4
GREEN
4 07 Sep 2021 00:00 Tropical storm 93 no people no people 15.6, 136.6
GREEN
5 07 Sep 2021 06:00 Category 1 120 no people no people 16.1, 135.7
GREEN
5 07 Sep 2021 18:00 Category 1 148 no people no people 16.5, 134.1
GREEN
5 08 Sep 2021 06:00 Category 2 176 no people no people 16.7, 132.3
GREEN
5 08 Sep 2021 18:00 Category 3 194 no people no people 17.1, 130.5
GREEN
5 09 Sep 2021 06:00 Category 3 204 no people no people 17.7, 128.5
GREEN
5 10 Sep 2021 06:00 Category 4 213 3.1 million people 6900 people 19.6, 124.6
ORANGE
5 11 Sep 2021 06:00 Category 4 213 27.9 million people 5.9 million people 21.5, 121.8
GREEN
5 12 Sep 2021 06:00 Category 2 157 no people no people 23.2, 119.5
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.
Download:



Exposed population - AoIs

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

Countries

Country
China

Provinces

Region Province Country Population
Taiwan China 22.5 million people

Populated places

Name Region Province Country City class Population
O-luan-pi P'ing-tung Taiwan City -
Tai-tung T'ai-tung Taiwan City -
Maobitou P'ing-tung Taiwan City -
Ta-wu T'ai-tung Taiwan City -
Heng-chjun P'ing-tung Taiwan City -
Chao-chou P'ing-tung Taiwan City -
Tung-chiang P'ing-tung Taiwan City -
Wu-lung P'ing-tung Taiwan City -
Liu-chiu Hsu P'ing-tung Taiwan City -
Ping-tung P'ing-tung Taiwan Major city -
Feng-shan Kao-hsiung Taiwan Major city -
Chi-shan Kao-hsiung Taiwan City -
Kao-hsiung Kao-hsiung Chuen-shih Taiwan Major city -
Kang-shan Kao-hsiung Taiwan City -
Hsin-hua T'ai-nan Taiwan City -
Hai-pu Kao-hsiung Taiwan City -
Tai-nan T'ai-nan Shih Taiwan Major city -
Hsin-ying T'ai-nan Taiwan Major city -
Ma-tou T'ai-nan Taiwan City -
Chia-li T'ai-nan Taiwan City -
Hsüeh-chia T'ai-nan Taiwan City -
Po-tzu Chia-i Taiwan City -
Ma-kung P'eng-hu Taiwan Major 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)
Orchid Island KYD 10 Civ. Paved No 4500
Taitung TTT 37 Mil. Paved No 11000
Feng Nin 42 Civ. Paved Yes 7900
Hengchun HCN 13 Civ. Paved No 3500
Pingtung North 29 Mil. Paved No 8000
Pingtung South 24 Mil. Paved Yes 7800
Kaohsiung International KHH 9 Civ. Paved Yes 10300
Tso Ying 9 0
Kangshan 10 Mil. Paved No 7500
Highway Strip 331 334 11 0
Kuei Jen 30 0
Tainan TNN 19 Mil. Paved Yes 10000
Highway Strip 296 298 9 0
Makung AB MZG 31 Mil. Paved Yes 6500
P Eng Hu 21 0
Wang An 30 0
Chi Mei CMJ unknown 0

Ports

Name LOCODE Country
Lan Yu Island Taiwan
Tai Tung Taiwan
Kaohsiung TWKHH Taiwan
Tai Nan Taiwan
An Ping Chiang Taiwan
Peng Hu Taiwan

Dams

Reservoir Dam Name River Year
Tsengwen Tsengwen 1973
Wushantou Offstream Kuantien 1930

Nuclear plants

Name Country Reactors
MAANSHAN TAIWAN 2

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

0.2 m

The maximum Storm surge height is  0.2m in Raile, Philippines. This height is estimated for 11 Sep 2021 03:00 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 (8 locations). Calculation based on advisory number 5 of 07 Sep 2021 06:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert Date (UTC) Name Country Storm surge height (m)
11 Sep 2021 03:00 Raile Philippines  0.2
11 Sep 2021 03:00 Itbayat Philippines  0.2
11 Sep 2021 03:00 Santa Lucia Philippines  0.2
11 Sep 2021 06:00 Yeh-yu Taiwan  0.1
11 Sep 2021 06:00 I-la-la-la-k'ou Taiwan  0.1
11 Sep 2021 00:00 Mahatao Philippines  0.1
11 Sep 2021 00:00 Basco Philippines  0.1
11 Sep 2021 06:00 Hung-t'on Taiwan  0.1