Overall Red alert Tropical Cyclone for MARIA-18
in China, Japan


Tropical Cyclone MARIA-18 can have a high humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source GDACS (JTWC)
Glide number: TC-2018-000110-CHN
Exposed countries China, Japan
Exposed population 25.4 million in Category 1 or higher
Maximum wind speed 250 km/h
Maximum storm surge
Vulnerability Medium (China)


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
GDACS Current 194 km/h 0.0 m n.a. 0.5
GDACS Overall 250 km/h 0.0 m n.a. 0.5

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


194 km/h Current

Up to no people in Category 1 strength or higher (see SSHS)

Impact Timeline

Alert Date (UTC) Max Winds (km/h) Population in
Tropical Storm
Population in
Cat. 1 or higher
Green 1 02 Jul 2018 18:00 176 160 thousand No people Guam
Green 2 03 Jul 2018 00:00 194 160 thousand No people Guam

Bulletin Timeline

Alert Date (UTC) Category Max winds
Population in
Tropical Storm
Population in
Cat.1 or higher
Location (lat, lon) Countries
1 02 Jul 2018 18:00 Tropical depression 46 no people no people 9.9, 146
2 03 Jul 2018 00:00 Tropical depression 46 no people no people 10.4, 145.8
2 03 Jul 2018 12:00 Tropical depression 56 17000 people no people 11.2, 145.4 Guam
2 04 Jul 2018 00:00 Tropical storm 74 160000 people no people 12, 144.6 Guam
2 04 Jul 2018 12:00 Tropical storm 102 160000 people no people 12.9, 143.7 Guam
2 05 Jul 2018 00:00 Category 1 120 150000 people no people 14, 142.6 Guam
2 06 Jul 2018 00:00 Category 2 157 no people no people 16, 141.2
2 07 Jul 2018 00:00 Category 2 176 no people no people 18.9, 140.3
2 08 Jul 2018 00:00 Category 3 194 no people no people 22.1, 137.8
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.

Exposed population

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.


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.



No locations affected by storm surge > 10 cm

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.

Locations affected by Storm surge (0 locations). Calculation based on advisory number 2 of 03 Jul 2018 00:00:00 UTC. (Simulation using 2 minute resolution)

Alert Date (UTC) Name Country Storm surge height (m)