Overall Green alert Tropical Cyclone for FLORENCE-18
in United States
30 Aug 2018 15 UTC
click on to select bulletin time
Impact Single TC
Impact all weather systems in the area


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

Meteorological source GDACS (NOAA)
Exposed countries United States
Exposed population 1.5 million in Category 1 or higher
Maximum wind speed 241 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
GDACS Current 120 km/h 0.0 m n.a. 0.5
GDACS Overall 241 km/h 0.0 m n.a. 0.5

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

Impact Timeline

Alert Date (UTC) Max Winds (km/h) Population in
Tropical Storm
Population in
Cat. 1 or higher
Green 1 30 Aug 2018 15:00 120 50 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 30 Aug 2018 15:00 Tropical depression 46 no people no people 12.9, -18.4
1 31 Aug 2018 00:00 Tropical depression 56 no people no people 13.2, -20.1
1 31 Aug 2018 12:00 Tropical storm 65 no people no people 13.5, -22
1 01 Sep 2018 00:00 Tropical storm 83 47000 people no people 14, -24 Cape Verde
1 01 Sep 2018 12:00 Tropical storm 102 no people no people 15, -27
1 02 Sep 2018 12:00 Category 1 120 no people no people 16.5, -33
1 03 Sep 2018 12:00 Category 1 120 no people no people 18.5, -38
1 04 Sep 2018 12:00 Category 1 120 no people no people 20, -42
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 1 of 30 Aug 2018 15:00:00 UTC. (Simulation using 6 minute resolution)

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