Overall Red alert Tropical Cyclone for CHANTHU-21
in China, Philippines
09 Sep 2021 12 UTC
click on to select bulletin time
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 HWRF
Exposed countries China, Taiwan, Japan, Philippines
Exposed population 20 thousand in Category 1 or higher
Maximum wind speed 230 km/h
Maximum storm surge 0.4 m (09 Sep 12:00 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
HWRF Current 230 km/h 0.4 m 233 mm 0.5
HWRF Overall 274 km/h 1.9 m 2082 mm 1.5

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

TOP

Wind

274 km/h

Up to 20 thousand in Category 1 strength or higher (see SSHS)



Wind exposed population - AoIs

Estimations based on the bulletin of 09 Sep 2021 12:00 UTC
CategoryCountryPopulation 
CAT. 4Taiwan, Philippines3,419
+
Taiwan1,835 
Philippines1,584 
CAT. 3Taiwan, Philippines2,271
+
Taiwan527 
Philippines1,743 
CAT. 2Taiwan, Philippines4,300
+
Taiwan1,714 
Philippines2,586 
CAT. 1Philippines10,824 
Tropical StormChina, Taiwan, Japan, Philippines10,569,864
+
China94,106 
Taiwan10,242,769 
Japan52,240 
Philippines180,748 

See TC classification SSHS


Wind Impact Timeline

people affected <=10000
10000< people affected <=100000
people affected >100000


Alert N° Date (UTC) Max Winds (km/h) Pop in Cat. 1 or higher TS Cat. 1 Cat. 2 Cat. 3 Cat. 4 Cat. 5 Countries
GREEN 1 06 Sep 2021 06:00 58 - - - - - - -
GREEN 2 06 Sep 2021 12:00 0 - - - - - - -
GREEN 3 06 Sep 2021 18:00 72 - - - - - - -
GREEN 4 07 Sep 2021 00:00 104 - - - - - - -
GREEN 5 07 Sep 2021 06:00 194 - - - - - - -
GREEN 6 07 Sep 2021 12:00 162 - - - - - - -
GREEN 7 07 Sep 2021 18:00 259 - - - - - - -
GREEN 8 08 Sep 2021 00:00 266 - - - - - - -
GREEN 9 08 Sep 2021 06:00 270 - - - - - - -
GREEN 10 08 Sep 2021 12:00 252 - - - - - - -
GREEN 11 08 Sep 2021 18:00 256 - - - - - - -
GREEN 12 09 Sep 2021 00:00 266 - - - - - - -
GREEN 13 09 Sep 2021 06:00 234 - - - - - - -
GREEN 14 09 Sep 2021 12:00 238 20 thousand
- China, Taiwan, Japan, Philippines
Download:





Impact estimation for the next 72h
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Rainfall





Rain exposed population - AoIs

Estimations based on the bulletin of 09 Sep 2021 12:00 UTC
LevelCountryPopulation 
750-1000 mmTaiwan35 
500-750 mmTaiwan87,442 
250-500 mmTaiwan, Philippines692,407
+
Taiwan420,682 
Philippines271,724 
100-250 mmChina, Taiwan, Philippines4,928,794
+
China109,569 
Taiwan3,785,764 
Philippines1,033,460 
50-100 mmChina, Taiwan, Japan, Philippines19,850,044
+
China1,060,289 
Taiwan11,390,753 
Japan3,685 
Philippines7,395,316 

Rain Impact Timeline

people affected <=10000
10000< people affected <=100000
people affected >100000


Alert N° Date (UTC) Max Rainfall (mm) Pop >100mm or higher 50-100 100-250 250-500 500-750 750-1000 >1000 Countries
Blue 1 06 Sep 2021 06:00 152 - - - - - - -
Blue 2 06 Sep 2021 12:00 0 - - - - - - -
Blue 3 06 Sep 2021 18:00 276 - - - - - - -
Blue 4 07 Sep 2021 00:00 128 - - - - - - -
Blue 5 07 Sep 2021 06:00 210 - - - - - - -
Blue 6 07 Sep 2021 12:00 148 - - - - - - -
Blue 7 07 Sep 2021 18:00 268 - - - - - - -
Blue 8 08 Sep 2021 00:00 386 - - - - - - -
Blue 9 08 Sep 2021 06:00 405 - - - - - - -
Blue 10 08 Sep 2021 12:00 319 - - - - - - -
Blue 11 08 Sep 2021 18:00 250 - - - - - - -
Blue 12 09 Sep 2021 00:00 353 - - - - - - -
Blue 13 09 Sep 2021 06:00 306 - - - - - - -
Blue 14 09 Sep 2021 12:00 1210 5.7 million
- China, Taiwan, Japan, Philippines




Impact estimation for the next 72h
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StormSurge

The calculations have been performed using NAMIDANCE computer code, from Middle East Technical University.
reference: Zaytsev, Andrey; Kurkin, Andrey; Pelinovsky, Efim; Yalciner, Ahmet C. - NUMERICAL TSUNAMI MODEL NAMI-DANCE. - Science of Tsunami Hazards . Nov2019, Vol. 38 Issue 4, p151-168. 18p.
Doaj

0.4 m

The JRC has developed an experimental global storm surge model, which is run after each advisory issued by the regional tropical cyclone centres. 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.

Storm Surge Exposed population - AoIs


Storm Surge Exposed locations

Calculation based on the bulletin of 09 Sep 2021 12:00 UTC