Overall Green alert Tropical Cyclone for HELENE-18
in Portugal, Ireland, United Kingdom


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

Meteorological source GDACS (NOAA)
Exposed countries Portugal, Ireland, United Kingdom
Exposed population No people in Category 1 or higher
Maximum wind speed 185 km/h
Maximum storm surge
Vulnerability Low (Portugal)


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 111 km/h n.a. n.a. 0.5
GDACS Overall 185 km/h 0.0 m n.a. 0.5

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


111 km/h Current

Up to 190000 people in Tropical storm (see SSHS)

Impact Timeline

Alert Date (UTC) Max Winds (km/h) Population in
Tropical Storm
Population in
Cat. 1 or higher
Green 1 07 Sep 2018 15:00 111 200 thousand No people Cape Verde

Bulletin Timeline

Alert Date (UTC) Category Max winds
Population in
Tropical Storm
Population in
Cat.1 or higher
Location (lat, lon) Countries
1 07 Sep 2018 15:00 Tropical depression 56 no people no people 13.1, -17.8
1 08 Sep 2018 00:00 Tropical storm 65 no people no people 13.3, -18.6
1 08 Sep 2018 12:00 Tropical storm 74 no people no people 13.8, -20.3
1 09 Sep 2018 00:00 Tropical storm 83 190000 people no people 14.2, -22.6 Cape Verde
1 09 Sep 2018 12:00 Tropical storm 93 6500 people no people 14.6, -25.4
1 10 Sep 2018 12:00 Tropical storm 102 no people no people 16, -32
1 11 Sep 2018 12:00 Tropical storm 111 no people no people 18, -37
1 12 Sep 2018 12:00 Tropical storm 102 no people no people 20, -41
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.

Exposed population


Cape Verde


Region Province Country Population
Cape Verde Cape Verde 440000 people

Populated places

Name Region Province Country City class Population
Praia Cape Verde Capital 110000 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)
Francisco Mendes RAI 70 Civ. Paved Yes 4200
Mosteiros MTI unknown 0
Sao Filipe SFL 160 Civ. Paved No 3900


Name LOCODE Country
Praia CVRAI Cape Verde
San Filipe Cape Verde
Brava Island Cape Verde


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 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 1 of 07 Sep 2018 15:00:00 UTC. (Simulation using 0.5 minute resolution)

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