CDMP Storm Hazard Atlas: Grenada

1
Grenada Probable Storm Effects
Carriacou
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 2.2 at 11.8 degrees North, and
stretched 2.4 at 12.45 degrees North. All model
results were calculated using great-circle
distances based on the WGS84 datum.
Points of Interest
Ronde Island
1. Grenville Town on low ground with barrier
reef,
2. St. Georges Main town with harbour.
3. Pt. Salines Southwest peninsula, with
airport. Wave and surge readings are for 1 cell
to the west.
1
Grenville
Grenada
2
St. Georges
Note Waves and surges for Points of Interest
are reported from the nearest cell offshore.
3
Pt. Salines
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
Grenada
1. Grenville 21 m/s
2. St. Georges 21 m/s
3. Pt. Salines 20 m/s
1
2
3
N
3
Waves
10-Year Return Time
Grenada
1. Grenville 2.6 m
2. St. Georges 2.6 m
3. Pt. Salines 2.6 m
1
2
3
N
4
Surges
10-Year Return Time
Grenada
1. Grenville 0.1 m
2. St. Georges 0.0 m
3. Pt. Salines 0.0 m
1
2
3
N
5
Winds
25-Year Return Time
Grenada
1. Grenville 28 m/s
2. St. Georges 28 m/s
3. Pt. Salines 28 m/s
1
2
3
N
6
Waves
25-Year Return Time
Grenada
1. Grenville 3.5 m
2. St. Georges 3.5 m
3. Pt. Salines 3.5 m
1
2
3
N
7
Surges
25-Year Return Time
Grenada
1. Grenville 0.2 m
2. St. Georges 0.1 m
3. Pt. Salines 0.1 m
1
2
3
N
8
Winds
50-Year Return Time
Grenada
1. Grenville 33 m/s
2. St. Georges 32 m/s
3. Pt. Salines 33 m/s
1
2
3
N
9
Waves
50-Year Return Time
Grenada
1. Grenville 4.2 m
2. St. Georges 4.1 m
3. Pt. Salines 4.1 m
1
2
3
N
10
Surges
50-Year Return Time
Grenada
1. Grenville 0.3 m
2. St. Georges 0.2 m
3. Pt. Salines 0.2 m
1
2
3
N
11
Winds
100-Year Return Time
Grenada
1. Grenville 38 m/s
2. St. Georges 37 m/s
3. Pt. Salines 37 m/s
1
2
3
N
12
Waves
100-Year Return Time
Grenada
1. Grenville 4.7 m
2. St. Georges 4.7 m
3. Pt. Salines 4.6 m
1
2
3
N
13
Surges
100-Year Return Time
Grenada
1. Grenville 0.4 m
2. St. Georges 0.3 m
3. Pt. Salines 0.3 m
1
2
3
N