CDMP Storm Hazard Atlas: Virgin Islands

1
Virgin Is. (Northeast) 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 5.3 at 18.25 degrees North, and
stretched 5.7 at 18.775 degrees North. All
model results were calculated using great-circle
distances based on the WGS84 datum.
Anegada
Tortola
Virgin Gorda
2
Road Town
1
St. Thomas
St. John
Charlotte Amalie

• 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.

N
Points of Interest
Note Waves and surges for Points of Interest
are reported from the nearest cell offshore.
1. Charlotte Amalie Major port and town.
Note Several small islands appear co-joined at
this resolution.
2. Road Town Main town and harbour
2
Winds
10-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 32 m/s
2. Road Town 32 m/s
3
Waves
10-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 4.0 m
2. Road Town 4.0 m
4
Surges
10-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 0.3 m
2. Road Town 0.4 m
5
Winds
25-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 42 m/s
2. Road Town 41 m/s
6
Waves
25-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 5.2 m
2. Road Town 5.1 m
7
Surges
25-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 0.6 m
2. Road Town 0.9 m
8
Winds
50-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 48 m/s
2. Road Town 48 m/s
9
Waves
50-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 6.0 m
2. Road Town 6.0 m
10
Surges
50-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 0.9 m
2. Road Town 1.2 m
11
Winds
100-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 55 m/s
2. Road Town 54 m/s
12
Waves
100-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 6.9 m
2. Road Town 6.8 m
13
Surges
100-Year Return Time
Virgin Islands, Northeast
2
1
N
1. Charlotte Amalie 1.2 m
2. Road Town 1.5 m