Overall Green alert Tropical Cyclone for JOHN-18
in Mexico
Impact Single TC
Impact all weather systems in the area


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

Meteorological source GDACS
Exposed countries Mexico
Exposed population Few people in Category 1 or higher
Maximum wind speed 204 km/h
Maximum storm surge
Vulnerability Medium (Mexico)


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 176 km/h 0.0 m n.a. 0.5
GDACS Overall 204 km/h 0.0 m n.a. 0.5

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


176 km/h Current Max.

Up to <1000 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
Green 1 05 Aug 2018 21:00 167 Few people Few people Mexico
Green 2 06 Aug 2018 03:00 176 Few people Few people Mexico

Bulletin Timeline

Alert Date (UTC) Category Max winds
Population in
Tropical Storm
Population in
Cat.1 or higher
Location (lat, lon) Countries
1 05 Aug 2018 21:00 Tropical depression 56 no people no people 14.6, -105.8
2 06 Aug 2018 03:00 Tropical storm 65 no people no people 14.9, -106.2
2 06 Aug 2018 12:00 Tropical storm 83 no people no people 15.6, -107
2 07 Aug 2018 00:00 Tropical storm 111 no people no people 16.3, -107.9
2 07 Aug 2018 12:00 Category 1 139 <1000 people no people 17.3, -108.9 Mexico
2 08 Aug 2018 00:00 Category 2 167 <1000 people <1000 people 18.5, -110.3 Mexico
2 09 Aug 2018 00:00 Category 2 176 no people no people 21.5, -113.5
2 10 Aug 2018 00:00 Category 1 120 no people no people 24, -118
2 11 Aug 2018 00:00 Tropical storm 74 no people no people 26, -122
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.

Exposed population - AoIs

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




Region Province Country Population
Baja California Sur Mexico 340000 people

Critical infrastructure

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


Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft)
Isla Socorro 100 0


Name LOCODE Country
Socorro Island Mexico


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.



0 m

The maximum Storm surge height is  0.1m in Agua del Coyote, Mexico. This height is estimated for 09 Aug 2018 16:00 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 (1 locations). Calculation based on advisory number 19 of 10 Aug 2018 09:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert Date (UTC) Name Country Storm surge height (m)
09 Aug 2018 16:00 Agua del Coyote Mexico  0.1