CDMP Storm Hazard Atlas: Tobago

1
Tobago Probable Storm Effects
The projection of the illustrations is Plate
Carrée, a square grid of latitude and longitude.
Resolution is 30 arc-seconds. North-South
distances are true to scale. East-West distances
are stretched 1.8 at 10.9 degrees North, and
stretched 2.1 at 11.55 degrees North. All model
results were calculated using great-circle
distances based on the WGS84 datum.
Points of Interest
1. Scarborough Main town and harbour.
2. Roxborough Small town.
2
Tobago
Note Waves and surges for Points of Interest
are reported from the nearest cell offshore.
Roxborough
1
Scarborough
N

• This set of maps is part of Section 2 of the
  Atlas of Probable Storm Effects in the Caribbean
  Sea, which was sponsored by the Caribbean
  Disaster Mitigation Project (CDMP), a joint
  effort of the Organization of American States
  (OAS) and the US Agency for International
  Development (USAID). These maps are a result of
  new techniques for modeling storms and
  estimating the probabilities of storms, developed
  in part under the patronage of CDMP. Refer to
  the Atlas for explanatory materials.
• WINDS represent sustained 1-minute winds at 10 m
  above the surface, and include both surface
  friction and topographic effects at a resolution
  of 30 arc-seconds. Friction factors derive from
  a Level I land-cover classification, with water,
  forest and open land predominating. If using
  wind damage models or building codes which
  internally include surface friction or
  topographic corrections, the nearest open-water
  wind speed from one of these maps may be used as
  input. Careful judgement is advised in reading
  and applying the values.
• SURGES include astronomical tide and setups from
  pressure, wind and wave, but not wave runup.
  Surges over land are shown as elevation above sea
  level, not water depth.
• WAVES are the heights of wave crests above the
  storm surge level in open water. Shoreline
  effects do not appear at this resolution.

2
Winds
10-Year Return Time
Tobago
1. Scarborough 17 m/s
2. Roxborough 18 m/s
2
1
N
3
Waves
10-Year Return Time
Tobago
1. Scarborough 2.2 m
2. Roxborough 2.2 m
2
1
N
4
Surges
10-Year Return Time
Tobago
1. Scarborough 0.1 m
2. Roxborough 0.0 m
2
1
N
5
Winds
25-Year Return Time
Tobago
1. Scarborough 22 m/s
2. Roxborough 23 m/s
2
1
N
6
Waves
25-Year Return Time
Tobago
1. Scarborough 2.8 m
2. Roxborough 2.9 m
2
1
N
7
Surges
25-Year Return Time
Tobago
1. Scarborough 0.2 m
2. Roxborough 0.1 m
2
1
N
8
Winds
50-Year Return Time
Tobago
1. Scarborough 27 m/s
2. Roxborough 27 m/s
2
1
N
9
Waves
50-Year Return Time
Tobago
1. Scarborough 3.4 m
2. Roxborough 3.4 m
2
1
N
10
Surges
50-Year Return Time
Tobago
1. Scarborough 0.3 m
2. Roxborough 0.2 m
2
1
N
11
Winds
100-Year Return Time
Tobago
1. Scarborough 31 m/s
2. Roxborough 32 m/s
2
1
N
12
Waves
100-Year Return Time
Tobago
1. Scarborough 3.9 m
2. Roxborough 4.0 m
2
1
N
13
Surges
100-Year Return Time
Tobago
1. Scarborough 0.5 m
2. Roxborough 0.2 m
2
1
N