Anguilla & Vicinity Anguilla Probable Storm Effects Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 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 5.1% at 17.8 degrees North, and stretched 5.4% at 18.4 degrees North. All model results were calculated using great-circle distances based on the WGS84 datum. Anguilla Ross Wagenseil for CDMP January 2000 Island Harbour Points of Interest: 1 Anguilla 1. Island Harbour is protected by a complicated system of reefs to the north. 2 Little Harbour 2. Little Harbour is near a gap in the fringing reefs on the south shore. St. Martin 3 3. Phillipsburg: Main town and harbour. Phillipsburg N St. Maartin Note: Waves and surges for Points of Interest are reported from the nearest cell offshore. St. Bart. MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 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. Wind Wave Surge 10yr 25yr 50yr 100yr SELECT

1 2 3 4 5 Winds Wind Speeds 10-Year Return Time Anguilla & vicinity N Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 10-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 32 m/s 2. Little Harbour: 31 m/s 3 3. Phillipsburg: 31 m/s N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Wind Speeds 1 2 3 4 5 knots mph kph m/s Storm Category 25 50 75 100 125 150 200 250 10 20 30 40 60 70 Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

Waves Wave Heights 1 2 3 4 5 6 7 10 15 20 25 10-Year Return Time Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 10-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 3.9 m high, immediately to the north 2. Little Harbour: 3.4 to 3.9 m high, immediately to the south and east 3 3. Phillipsburg: 3.9 m N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Wave Heights Meters Feet 1 2 3 4 5 6 7 10 15 20 25 Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

Surges Surge Heights 1 2 3 4 5 6 10 15 20 10-Year Return Time Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 10-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 0.3 m high, immediately offshore to the north 2. Little Harbour: 0.3 m high, offshore to the south and east 3 3. Phillipsburg: 0.2 m N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Surge Heights 1 2 3 4 5 6 10 15 20 Meters Feet Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

1 2 3 4 5 Winds Wind Speeds 25-Year Return Time Anguilla & vicinity N Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 25-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 41 m/s 2. Little Harbour: 40 m/s 3 3. Phillipsburg: 40 m/s N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Wind Speeds 1 2 3 4 5 knots mph kph m/s Storm Category 25 50 75 100 125 150 200 250 10 20 30 40 60 70 Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

Waves Wave Heights 1 2 3 4 5 6 7 10 15 20 25 25-Year Return Time Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 25-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 5.1 m high, immediately offshore to the north 2. Little Harbour: 3.6 m to the south, 3.7 m to the east, and 5.0 m immediately offshore to the southeast. 3 3. Phillipsburg: 4.9 m N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Wave Heights Meters Feet 1 2 3 4 5 6 7 10 15 20 25 Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

Surges Surge Heights 1 2 3 4 5 6 10 15 20 25-Year Return Time Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 25-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 0.6 m immediately offshore to the north 2. Little Harbour: 0.6 m to 0.7 m immediately offshore 3 3. Phillipsburg: 0.5 m N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Surge Heights 1 2 3 4 5 6 10 15 20 Meters Feet Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

1 2 3 4 5 Winds Wind Speeds 50-Year Return Time Anguilla & vicinity N Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 50-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 47 m/s 2. Little Harbour: 47 m/s 3 3. Phillipsburg: 46 m/s N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Wind Speeds 1 2 3 4 5 knots mph kph m/s Storm Category 25 50 75 100 125 150 200 250 10 20 30 40 60 70 Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

Waves Wave Heights 1 2 3 4 5 6 7 10 15 20 25 50-Year Return Time Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 50-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 5.9 m high offshore 2. Little Harbour: 3.8 m high near shore, 5.4 m high a little farther out 3 3. Phillipsburg: 5.1 m N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Wave Heights Meters Feet 1 2 3 4 5 6 7 10 15 20 25 Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

Surges Surge Heights 1 2 3 4 5 6 10 15 20 50-Year Return Time Ross Wagenseil for CDMP March 2000K CDMP 17.8 N 63.4 W 18.4 N 62.6 W 50-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 0.9 m high immediately offshore 2. Little Harbour: 0.9 m high, immediately offshore 3 3. Phillipsburg: 0.8 m N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Surge Heights 1 2 3 4 5 6 10 15 20 Meters Feet Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

1 2 3 4 5 Winds Wind Speeds 100-Year Return Time Anguilla & vicinity N Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 100-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 53 m/s 2. Little Harbour: 53 m/s 3 3. Phillipsburg: 53 m/s N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Wind Speeds 1 2 3 4 5 knots mph kph m/s Storm Category 25 50 75 100 125 150 200 250 10 20 30 40 60 70 Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

Waves Wave Heights 1 2 3 4 5 6 7 10 15 20 25 100-Year Return Time Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 100-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 6.8 m high offshore 2. Little Harbour: 4.1 m at the shore, 5.6 m high a little farther out 3 3. Phillipsburg: 5.3 m N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Wave Heights Meters Feet 1 2 3 4 5 6 7 10 15 20 25 Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max

Surges Surge Heights 1 2 3 4 5 6 10 15 20 100-Year Return Time Ross Wagenseil for CDMP March 2000 CDMP 17.8 N 63.4 W 18.4 N 62.6 W 100-Year Return Time Anguilla & vicinity 1 2 1. Island Harbour: 1.2 m high at the shore 2. Little Harbour: 1.3 m high at the shore 3 3. Phillipsburg: 1.0 m N MILES 10 20 30 KILOMETERS ARC-MINUTES 5 15 Surge Heights 1 2 3 4 5 6 10 15 20 Meters Feet Wind Wave Surge 10yr 25yr 50yr 100yr SELECT Min Max