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 0.7 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

Wind

241 km/h Current Max.

Up to 55000 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
Orange 6 07 Sep 2021 12:00 241 32.3 million 50 thousand 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
6 07 Sep 2021 12:00 Category 1 130 no people no people 16.3, 134.6
GREEN
6 08 Sep 2021 00:00 Category 2 167 no people no people 16.4, 132.7
GREEN
6 08 Sep 2021 12:00 Category 3 194 no people no people 16.7, 130.9
GREEN
6 09 Sep 2021 00:00 Category 4 213 no people no people 17.1, 129.1
GREEN
6 09 Sep 2021 12:00 Category 4 231 49000 people no people 17.9, 126.9
ORANGE
6 10 Sep 2021 12:00 Category 4 241 6.5 million people 44000 people 20, 122.9
ORANGE
6 11 Sep 2021 12:00 Category 4 213 32.3 million people 39000 people 21.7, 120.6
GREEN
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.
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 -
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

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

0.7 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