Overall Green alert Tropical Cyclone for ISAAC-18
in Montserrat, Guadeloupe, Antigua and Barbuda, Dominica, Martinique, Saint Vincent and the Grenadines, Saint Lucia, Barbados

Impact

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

Meteorological source GDACS (NOAA)
Exposed countries Montserrat, Guadeloupe, Antigua and Barbuda, Dominica, Martinique, Saint Vincent and the Grenadines, Saint Lucia, Barbados
Exposed population No people in Category 1 or higher
Maximum wind speed 157 km/h
Maximum storm surge 0.2 m (13 Sep 17:00 UTC)
Vulnerability High (Montserrat)

GDACS Score

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 65 km/h n.a. n.a. 0.5
GDACS Overall 157 km/h 0.2 m n.a. 0.5

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

Wind

65 km/h Current

Up to 1.5 million 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
Countries
Green 1 07 Sep 2018 21:00 139 No people No people
Green 2 08 Sep 2018 03:00 157 No people No people
Green 3 08 Sep 2018 09:00 148 No people No people
Green 4 08 Sep 2018 15:00 148 520 thousand No people Barbados, Martinique, Saint Lucia
Green 5 08 Sep 2018 21:00 139 600 thousand 120 thousand Martinique
Green 6 09 Sep 2018 03:00 157 740 thousand 200 thousand Martinique
Green 7 09 Sep 2018 09:00 157 660 thousand 40 thousand Martinique, Dominica
Green 8 09 Sep 2018 15:00 157 650 thousand 390 thousand Martinique
Green 9 09 Sep 2018 21:00 157 980 thousand 70 thousand Dominica
Green 10 10 Sep 2018 03:00 157 890 thousand 70 thousand Dominica
Green 11 10 Sep 2018 09:00 148 890 thousand 70 thousand Dominica
Green 12 10 Sep 2018 15:00 139 890 thousand 70 thousand Dominica
Green 13 10 Sep 2018 21:00 139 930 thousand 70 thousand Dominica
Green 14 11 Sep 2018 03:00 120 980 thousand 60 thousand Dominica
Green 15 11 Sep 2018 09:00 120 920 thousand No people Martinique, Saint Lucia, Guadeloupe, Dominica, Montserrat
Green 16 11 Sep 2018 15:00 120 1 million No people Martinique, Saint Lucia, Guadeloupe, Dominica
Green 17 11 Sep 2018 21:00 111 1 million No people Martinique, Saint Lucia, Guadeloupe, Dominica
Green 18 12 Sep 2018 03:00 102 820 thousand No people Martinique, Saint Lucia, Dominica, Guadeloupe
Green 19 12 Sep 2018 09:00 93 1 million No people Martinique, Saint Lucia, Dominica, Guadeloupe
Green 20 12 Sep 2018 15:00 93 1000 thousand No people Martinique, Saint Lucia, Guadeloupe, Dominica
Green 21 12 Sep 2018 21:00 93 1.2 million No people Martinique, Guadeloupe, Dominica, Antigua and Barbuda, Montserrat, Jamaica
Green 22 13 Sep 2018 03:00 83 1.2 million No people Barbados, Martinique, Saint Lucia, Guadeloupe, Dominica, Antigua and Barbuda, Montserrat
Green 23 13 Sep 2018 09:00 74 1.5 million No people Martinique, Dominica, Guadeloupe, Saint Lucia, Barbados, Saint Vincent and the Grenadines, Antigua and Barbuda, Montserrat, Saint Kitts and Nevis
Green 24 13 Sep 2018 15:00 74 1.5 million No people Dominica, Martinique, Guadeloupe, Saint Lucia, Saint Vincent and the Grenadines, Montserrat, Antigua and Barbuda, Barbados
Green 25 13 Sep 2018 21:00 65 1.5 million No people Dominica, Guadeloupe, Martinique, Montserrat, Saint Lucia, Saint Vincent and the Grenadines, Antigua and Barbuda, Barbados
Green 26 14 Sep 2018 03:00 65 1.5 million No people Montserrat, Guadeloupe, Dominica, Martinique, Antigua and Barbuda, Saint Lucia, Saint Vincent and the Grenadines, Barbados
Green 27 14 Sep 2018 09:00 56 1.5 million No people Montserrat, Guadeloupe, Dominica, Antigua and Barbuda, Martinique, Saint Lucia, Saint Vincent and the Grenadines, Barbados
Green 28 14 Sep 2018 15:00 56 1.5 million No people Montserrat, Guadeloupe, Antigua and Barbuda, Dominica, Martinique, Saint Vincent and the Grenadines, Saint Lucia, Barbados
Green 29 14 Sep 2018 21:00 65 1.5 million No people Montserrat, Guadeloupe, Antigua and Barbuda, Dominica, Martinique, Saint Vincent and the Grenadines, Saint Lucia, Barbados
Green 30 15 Sep 2018 03:00 65 1.5 million No people Montserrat, Guadeloupe, Antigua and Barbuda, Dominica, Martinique, Saint Vincent and the Grenadines, Saint Lucia, Barbados

Bulletin Timeline

Alert Date (UTC) Category Max winds
(km/h)
Population in
Tropical Storm
Population in
Cat.1 or higher
Location (lat, lon) Countries
GREEN
1 07 Sep 2018 21:00 Tropical depression 56 no people no people 13.6, -34.9
GREEN
2 08 Sep 2018 03:00 Tropical depression 56 no people no people 13.9, -34.9
GREEN
3 08 Sep 2018 09:00 Tropical depression 56 no people no people 14.3, -35.4
GREEN
4 08 Sep 2018 15:00 Tropical depression 56 no people no people 14.6, -36
GREEN
5 08 Sep 2018 21:00 Tropical storm 65 no people no people 14.5, -36.6
GREEN
6 09 Sep 2018 03:00 Tropical storm 83 no people no people 14.4, -37.5
GREEN
7 09 Sep 2018 09:00 Tropical storm 83 no people no people 14.5, -38.1
GREEN
8 09 Sep 2018 15:00 Tropical storm 102 no people no people 14.3, -39.1
GREEN
9 09 Sep 2018 21:00 Tropical storm 111 no people no people 14.5, -40.3
GREEN
10 10 Sep 2018 03:00 Category 1 120 no people no people 14.5, -41.6
GREEN
11 10 Sep 2018 09:00 Category 1 120 no people no people 14.7, -42.7
GREEN
12 10 Sep 2018 15:00 Category 1 120 no people no people 14.7, -43.9
GREEN
13 10 Sep 2018 21:00 Category 1 120 no people no people 14.4, -45
GREEN
14 11 Sep 2018 03:00 Tropical storm 111 no people no people 14.5, -46.9
GREEN
15 11 Sep 2018 09:00 Tropical storm 111 no people no people 14.6, -48.1
GREEN
16 11 Sep 2018 15:00 Tropical storm 111 no people no people 14.6, -49.7
GREEN
17 11 Sep 2018 21:00 Tropical storm 111 no people no people 14.6, -51.3
GREEN
18 12 Sep 2018 03:00 Tropical storm 102 no people no people 14.5, -52.3
GREEN
19 12 Sep 2018 09:00 Tropical storm 93 no people no people 14.5, -53.5
GREEN
20 12 Sep 2018 15:00 Tropical storm 93 no people no people 15, -54.7
GREEN
21 12 Sep 2018 21:00 Tropical storm 93 <1000 people no people 15.4, -56.6
GREEN
22 13 Sep 2018 03:00 Tropical storm 83 1.1 million people no people 15.3, -58 Antigua and Barbuda
GREEN
23 13 Sep 2018 09:00 Tropical storm 74 1.4 million people no people 15.4, -59.7 Montserrat
GREEN
24 13 Sep 2018 15:00 Tropical storm 74 1.2 million people no people 14.9, -61.8 Montserrat
GREEN
25 13 Sep 2018 21:00 Tropical storm 65 no people no people 14.9, -63.2
GREEN
26 14 Sep 2018 03:00 Tropical storm 65 no people no people 14.9, -64.4
GREEN
27 14 Sep 2018 09:00 Tropical depression 56 no people no people 15, -65.5
GREEN
28 14 Sep 2018 15:00 Tropical depression 56 no people no people 14.9, -67.3
GREEN
29 14 Sep 2018 21:00 Tropical storm 65 no people no people 15.3, -68.2
GREEN
30 15 Sep 2018 03:00 Tropical storm 65 no people no people 15.4, -69.5
GREEN
30 15 Sep 2018 12:00 Tropical storm 65 no people no people 15.5, -71.3
GREEN
30 16 Sep 2018 00:00 Tropical storm 65 no people no people 15.7, -73.3
GREEN
30 16 Sep 2018 12:00 Tropical storm 65 no people no people 16.2, -75.3
GREEN
30 17 Sep 2018 00:00 Tropical depression 56 no people no people 16.7, -77.4
GREEN
30 18 Sep 2018 00:00 Tropical depression 56 no people no people 18.7, -81.4 Cayman Islands
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.



Exposed population

Countries

Country
Montserrat
Guadeloupe
Antigua & Barbuda
Dominica
Martinique
St. Vincent & the Grenadines
St. Lucia
Barbados

Provinces

Region Province Country Population
Montserrat Montserrat -
Guadeloupe Guadeloupe 410000 people
Antigua & Barbuda Antigua and Barbuda 65000 people
Dominica Dominica 70000 people
Martinique Martinique 370000 people
St. Vincent & the Grenadines Saint Vincent and the Grenadines 110000 people
St. Lucia Saint Lucia 140000 people
Barbados Barbados 260000 people

Populated places

Name Region Province Country City class Population
Plymouth Saint Anthony Montserrat Capital no people
Basse-Terre Guadeloupe Capital 11000 people
Saint-Claude Guadeloupe City 10000 people
Saint John's Antigua and Barbuda Capital 21000 people
Capesterre Guadeloupe City -
Pointe-à-Pitre Guadeloupe City -
Roseau Saint George Dominica Capital 16000 people
Moule Guadeloupe City -
Fort-de-France Martinique Capital 88000 people
Kingstown Saint George St. Vincent and the Grenadines Capital 17000 people
Castries Castries St. Lucia Capital 12000 people
Bridgetown Saint Michael Barbados Capital 96000 people

Critical infrastructure

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

Airports

Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft)
Montserrat Blackburne MNI unknown 0
W H Bramble (Abandoned) 12 0
Basse-Terre Baillif BBR unknown 0
Terre-de-Bas HTB unknown 0
V C Bird International ANU 19 Civ. Paved Yes 9000
Terre de Haut LSS unknown 0
Le Raizet PTP 11 Civ. Paved Yes 11400
Canefield 4 Civ. Paved No 2500
Dominica Cane DCF unknown 0
Melville Hall DOM 24 Civ. Paved Yes 4800
Marie Galante GBJ 5 Civ. Paved Yes 4000
St. Francois SFC unknown 0
La Desirade Les Galets DSD unknown 0
Le Lamentin FDF 5 Civ. Paved Yes 10800
Union Island UNI unknown 0
J F Mitchell 4 Civ. Paved No 3600
E T Joshua SVD 20 Civ. Paved Yes 4600
Vigie SLU 6 Civ. Paved Yes 6200
Canouan 5 Civ. Paved No 3600
Hewanorra International UVF 3 Civ. Paved Yes 9000
Grantley Adams International BGI 52 Civ. Paved Yes 11000

Ports

Name LOCODE Country
Plymouth Montserrat
Basse Terre GPBBR Guadeloupe
Saint Johns AGSJO Antigua and Barbuda
Parham Harbour Antigua and Barbuda
Bourg Des Saintes Guadeloupe
Pointe-a-Pitre GPPTP Guadeloupe
Port Louis Guadeloupe
Portsmouth DMPOR Dominica
Roseau DMRSU Dominica
Grand Bourg Guadeloupe
Saint Louis Guadeloupe
Saint Pierre Martinique
Fort de France MQFDF Martinique
La Trinite Martinique
Le Robert Martinique
Kingstown VCKTN Saint Vincent and the Grenadines
Cul de Sac Bay LCCDS Saint Lucia
Castries LCSLU Saint Lucia
Admiralty Bay Saint Vincent and the Grenadines
Le Marin Martinique
Vieux Fort Saint Lucia
Speightstown Barbados
Bridgetown BBBGI Barbados

Dams

Reservoir Dam Name River Year
Saint Pierre la Manzo Manche 1978

Rainfall

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.

...

StormSurge

0.2 m

The maximum Storm surge height is  0.2m in Le Bourg, Guadeloupe. This height is estimated for 13 Sep 2018 17:00 UTC .

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 (18 locations). Calculation based on advisory number 21 of 12 Sep 2018 21:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert Date (UTC) Name Country Storm surge height (m)
13 Sep 2018 17:00 Le Bourg Guadeloupe  0.2
13 Sep 2018 16:00 Baie-Mahault Guadeloupe  0.2
13 Sep 2018 16:00 Grand-Bourg Guadeloupe  0.1
13 Sep 2018 15:00 Castle Bruce Dominica  0.1
13 Sep 2018 17:00 Sainte-Anne Guadeloupe  0.1
13 Sep 2018 17:00 Capesterre Guadeloupe  0.1
13 Sep 2018 15:00 Pointe-a-Pitre Guadeloupe  0.1
13 Sep 2018 18:00 Basse-Terre Guadeloupe  0.1
16 Sep 2018 21:00 Brazalitta Jamaica  0.1
16 Sep 2018 21:00 Mahoe Gardens Jamaica  0.1
13 Sep 2018 16:00 Saint-Louis Guadeloupe  0.1
13 Sep 2018 15:00 Capesterre Guadeloupe  0.1
13 Sep 2018 17:00 Portsmouth Dominica  0.1
13 Sep 2018 16:00 Baroui Dominica  0.1
13 Sep 2018 18:00 Saint-Claude Guadeloupe  0.1
13 Sep 2018 19:00 Bouillante Guadeloupe  0.1
13 Sep 2018 16:00 Marigot Dominica  0.1
13 Sep 2018 15:00 La Plaine Dominica  0.1