Overall Green alert Tropical Cyclone for OLIVIA-18
in United States


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

Meteorological source GDACS
Exposed countries United States
Exposed population No people in Category 1 or higher
Maximum wind speed 213 km/h
Maximum storm surge
Vulnerability Low (United States)


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 176 km/h 0.0 m n.a. 0.5
Overall 213 km/h 0.0 m n.a. 0.5

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

Impact Timeline

Alert Date (UTC) Max Winds (km/h) Population in
Tropical Storm or higher
Population in
Cat 1. or higher
Green 1 01 Sep 2018 03:00 176 Few people No people

Bulletin Timeline

Alert Date (UTC) Category
Max winds
Population in
Tropical Storm
or higher
Population in
Cat.1 or higher
Location (lat, lon) Countries
1 01 Sep 2018 03:00 Tropical depression 56 no people no people 14.3, -108.4
1 01 Sep 2018 12:00 Tropical depression 56 no people no people 15, -109.5
1 02 Sep 2018 00:00 Tropical storm 74 no people no people 15.6, -110.5
1 02 Sep 2018 12:00 Tropical storm 83 no people no people 16.1, -111.5
1 03 Sep 2018 00:00 Tropical storm 111 <1000 people no people 16.6, -112.7
1 04 Sep 2018 00:00 Category 1 139 <1000 people no people 17, -115
1 05 Sep 2018 00:00 Category 2 157 no people no people 17.4, -118.3
1 06 Sep 2018 00:00 Category 2 176 no people no people 18.3, -122.6
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

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.



0 m

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 (0 locations). Calculation based on advisory number 1 of 01 Sep 2018 03:00:00 UTC. (Simulation using 6 minute resolution)

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