Surf Forecast for Half Moon Bay
type: Dataset
description: 10-day surf forecast with Strike Scores for Half Moon Bay, Antigua, Antigua & Barbuda
about: Half Moon Bay
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: 17.05
    longitude: -61.6833
  description: Half Moon Bay is Antigua's premier surf beach—a crescent-shaped bay on the southeast coast that picks up NE swells. The picturesque setting and consistent waves make it the island's go-to surf spot.
summary:
  best day:
    date: 2026-08-06
    score: 12
    category: Poor
    explanation: Best day in the forecast: 2026-08-06 with a score of 12/100 (Poor)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 4/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-04
  day index: 0
  strike score:
    final score: 0
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 2
        out of: 25
        explanation: Poor alignment: Swell from 99° is 54° off optimal 45°, barely within workable range 30°-80°.
      swell size:
        score: 12
        out of: 25
        explanation: Marginal size: 1.0m is 0.3m from ideal 1.3m.
      swell period:
        score: 6
        out of: 25
        explanation: Moderate period: 8s meets minimum 8s but below ideal 12s. Some groundswell energy present.
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 18 km/h from 73° (ENE). Destroying wave quality. Offshore range: 240°-300°.
    adjustments:
      wind history:
        adjustment: -11
        groomed: false
        morning sickness: true
        explanation: -11 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
      windswell penalty:
        adjustment: 0
        windswell degraded: false
        explanation: Groundswell-dominant conditions (clean, long-period waves).
      secondary swell bonus:
        adjustment: 0
        explanation: No secondary swell bonus.
    summary: Poor conditions at Half Moon Bay. Either swell direction (99°), size (1.0m), or wind (18 km/h from 73°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1
      height ft: 3.3
      direction degrees: 99
      direction cardinal: E
      period s: 8
      explanation: 1.0m (3.3ft) swell from 99° (E) at 8s period
    wind:
      speed kmh: 18
      speed mph: 11.2
      direction degrees: 73
      direction cardinal: ENE
      explanation: 18 km/h (11 mph) from 73° (ENE)
    windswell:
      height m: 0.3
      period s: 2
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-05
  day index: 1
  strike score:
    final score: 10
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 3
        out of: 25
        explanation: Poor alignment: Swell from 97° is 52° off optimal 45°, barely within workable range 30°-80°.
      swell size:
        score: 10
        out of: 25
        explanation: Marginal size: 0.8m is 0.5m from ideal 1.3m.
      swell period:
        score: 23
        out of: 25
        explanation: Good period: 11s is 92% of ideal 12s. Clean, powerful groundswell.
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 19 km/h from 112° (ESE). Destroying wave quality. Offshore range: 240°-300°.
    adjustments:
      wind history:
        adjustment: -4
        groomed: false
        morning sickness: false
        explanation: No significant wind history adjustment.
      windswell penalty:
        adjustment: -3
        windswell degraded: false
        explanation: Groundswell-dominant conditions (clean, long-period waves).
      secondary swell bonus:
        adjustment: 0
        explanation: No secondary swell bonus.
    summary: Poor conditions at Half Moon Bay. Either swell direction (97°), size (0.8m), or wind (19 km/h from 112°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.8
      height ft: 2.6
      direction degrees: 97
      direction cardinal: E
      period s: 11
      explanation: 0.8m (2.6ft) swell from 97° (E) at 11s period
    wind:
      speed kmh: 19
      speed mph: 11.8
      direction degrees: 112
      direction cardinal: ESE
      explanation: 19 km/h (12 mph) from 112° (ESE)
    windswell:
      height m: 0.4
      period s: 3
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-06
  day index: 2
  strike score:
    final score: 12
    category: Poor
    category emoji: 💤
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 5
        out of: 25
        explanation: Poor alignment: Swell from 92° is 47° off optimal 45°, barely within workable range 30°-80°.
      swell size:
        score: 12
        out of: 25
        explanation: Marginal size: 1.0m is 0.3m from ideal 1.3m.
      swell period:
        score: 8
        out of: 25
        explanation: Moderate period: 9s meets minimum 8s but below ideal 12s. Some groundswell energy present.
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 21 km/h from 99° (E). Destroying wave quality. Offshore range: 240°-300°.
    adjustments:
      wind history:
        adjustment: 0
        groomed: false
        morning sickness: false
        explanation: No significant wind history adjustment.
      windswell penalty:
        adjustment: -3
        windswell degraded: false
        explanation: Groundswell-dominant conditions (clean, long-period waves).
      secondary swell bonus:
        adjustment: 0
        explanation: No secondary swell bonus.
    summary: Poor conditions at Half Moon Bay. Either swell direction (92°), size (1.0m), or wind (21 km/h from 99°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1
      height ft: 3.3
      direction degrees: 92
      direction cardinal: E
      period s: 9
      explanation: 1.0m (3.3ft) swell from 92° (E) at 9s period
    wind:
      speed kmh: 21
      speed mph: 13.0
      direction degrees: 99
      direction cardinal: E
      explanation: 21 km/h (13 mph) from 99° (E)
    windswell:
      height m: 0.6
      period s: 3
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-07
  day index: 3
  strike score:
    final score: 0
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 2
        out of: 25
        explanation: Poor alignment: Swell from 99° is 54° off optimal 45°, barely within workable range 30°-80°.
    summary: Poor conditions at Half Moon Bay. Either swell direction (99°), size (1.1m), or wind (21 km/h from 86°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T03:14:16.117Z
temporal coverage: 2026-08-04/2026-08-13
data sources: Open-Meteo Marine API (swell/wave data)
data sources: Open-Meteo Weather API (wind/weather data)

score: 14
out of: 25
explanation: Marginal size: 1.1m is 0.2m from ideal 1.3m.

score: 14
out of: 25
explanation: Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.

score: 0
out of: 25
explanation: Onshore/cross-shore: 21 km/h from 86° (E). Destroying wave quality. Offshore range: 240°-300°.

wind history:
  adjustment: -10
  groomed: false
  morning sickness: true
  explanation: -10 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
windswell penalty:
  adjustment: -3
  windswell degraded: false
  explanation: Groundswell-dominant conditions (clean, long-period waves).
secondary swell bonus:
  adjustment: 0
  explanation: No secondary swell bonus.

swell:
  height m: 1.1
  height ft: 3.6
  direction degrees: 99
  direction cardinal: E
  period s: 10
  explanation: 1.1m (3.6ft) swell from 99° (E) at 10s period
wind:
  speed kmh: 21
  speed mph: 13.0
  direction degrees: 86
  direction cardinal: E
  explanation: 21 km/h (13 mph) from 86° (E)
windswell:
  height m: 0.5
  period s: 3
  explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-08
day index: 4
strike score:
  final score: 0
  category: Poor
  category emoji: 💤
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 1
      out of: 25
      explanation: Poor alignment: Swell from 102° is 57° off optimal 45°, barely within workable range 30°-80°.
    swell size:
      score: 15
      out of: 25
      explanation: Marginal size: 1.2m is 0.1m from ideal 1.3m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 24 km/h from 74° (ENE). Destroying wave quality. Offshore range: 240°-300°.
  adjustments:
    wind history:
      adjustment: -17
      groomed: false
      morning sickness: true
      explanation: -17 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
    windswell penalty:
      adjustment: -3
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Half Moon Bay. Either swell direction (102°), size (1.2m), or wind (24 km/h from 74°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.2
    height ft: 3.9
    direction degrees: 102
    direction cardinal: ESE
    period s: 10
    explanation: 1.2m (3.9ft) swell from 102° (ESE) at 10s period
  wind:
    speed kmh: 24
    speed mph: 14.9
    direction degrees: 74
    direction cardinal: ENE
    explanation: 24 km/h (15 mph) from 74° (ENE)
  windswell:
    height m: 0.7
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-09
day index: 5
strike score:
  final score: 0
  category: Poor
  category emoji: 💤
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 3
      out of: 25
      explanation: Poor alignment: Swell from 97° is 52° off optimal 45°, barely within workable range 30°-80°.
    swell size:
      score: 19
      out of: 25
      explanation: Marginal size: 1.4m is 0.1m from ideal 1.3m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 21 km/h from 90° (E). Destroying wave quality. Offshore range: 240°-300°.
  adjustments:
    wind history:
      adjustment: -21
      groomed: false
      morning sickness: true
      explanation: -21 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
    windswell penalty:
      adjustment: 0
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Half Moon Bay. Either swell direction (97°), size (1.4m), or wind (21 km/h from 90°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.4
    height ft: 4.6
    direction degrees: 97
    direction cardinal: E
    period s: 10
    explanation: 1.4m (4.6ft) swell from 97° (E) at 10s period
  wind:
    speed kmh: 21
    speed mph: 13.0
    direction degrees: 90
    direction cardinal: E
    explanation: 21 km/h (13 mph) from 90° (E)
  windswell:
    height m: 0.5
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-10
day index: 6
strike score:
  final score: 0
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 5
      out of: 25
      explanation: Poor alignment: Swell from 93° is 48° off optimal 45°, barely within workable range 30°-80°.
    swell size:
      score: 15
      out of: 25
      explanation: Marginal size: 1.2m is 0.1m from ideal 1.3m.
    swell period:
      score: 8
      out of: 25
      explanation: Moderate period: 9s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 20 km/h from 82° (E). Destroying wave quality. Offshore range: 240°-300°.
  adjustments:
    wind history:
      adjustment: -21
      groomed: false
      morning sickness: true
      explanation: -21 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
    windswell penalty:
      adjustment: 0
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Half Moon Bay. Either swell direction (93°), size (1.2m), or wind (20 km/h from 82°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.2
    height ft: 3.9
    direction degrees: 93
    direction cardinal: E
    period s: 9
    explanation: 1.2m (3.9ft) swell from 93° (E) at 9s period
  wind:
    speed kmh: 20
    speed mph: 12.4
    direction degrees: 82
    direction cardinal: E
    explanation: 20 km/h (12 mph) from 82° (E)
  windswell:
    height m: 0.4
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-11
day index: 7
strike score:
  final score: 5
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 6
      out of: 25
      explanation: Poor alignment: Swell from 89° is 44° off optimal 45°, barely within workable range 30°-80°.
    swell size:
      score: 12
      out of: 25
      explanation: Marginal size: 1.0m is 0.3m from ideal 1.3m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 18 km/h from 94° (E). Destroying wave quality. Offshore range: 240°-300°.
  adjustments:
    wind history:
      adjustment: -11
      groomed: false
      morning sickness: true
      explanation: -11 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
    windswell penalty:
      adjustment: 0
      windswell degraded: false
      explanation: Groundswell-dominant conditions (clean, long-period waves).
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Half Moon Bay. Either swell direction (89°), size (1.0m), or wind (18 km/h from 94°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 89
    direction cardinal: E
    period s: 10
    explanation: 1.0m (3.3ft) swell from 89° (E) at 10s period
  wind:
    speed kmh: 18
    speed mph: 11.2
    direction degrees: 94
    direction cardinal: E
    explanation: 18 km/h (11 mph) from 94° (E)
  windswell:
    height m: 0.4
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-12
day index: 8
strike score:
  final score: 0
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 6
      out of: 25
      explanation: Poor alignment: Swell from 87° is 42° off optimal 45°, barely within workable range 30°-80°.
    swell size:
      score: 10
      out of: 25
      explanation: Marginal size: 0.8m is 0.5m from ideal 1.3m.
    swell period:
      score: 8
      out of: 25
      explanation: Moderate period: 9s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 26 km/h from 103° (ESE). Destroying wave quality. Offshore range: 240°-300°.
  adjustments:
    wind history:
      adjustment: -4
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    windswell penalty:
      adjustment: -7
      windswell degraded: true
      explanation: -7 points: Short-period windswell is present, creating choppy, disorganized conditions.
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Half Moon Bay. Either swell direction (87°), size (0.8m), or wind (26 km/h from 103°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.8
    height ft: 2.6
    direction degrees: 87
    direction cardinal: E
    period s: 9
    explanation: 0.8m (2.6ft) swell from 87° (E) at 9s period
  wind:
    speed kmh: 26
    speed mph: 16.2
    direction degrees: 103
    direction cardinal: ESE
    explanation: 26 km/h (16 mph) from 103° (ESE)
  secondary swell:
    height m: 0.4
    direction degrees: 107
    direction cardinal: ESE
    period s: 6
  windswell:
    height m: 1
    period s: 4
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-13
day index: 9
strike score:
  final score: 9
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 0
      out of: 25
      explanation: No alignment: Swell from 105° is outside workable range 30°-80°. Wrong swell direction for this spot.
    swell size:
      score: 17
      out of: 25
      explanation: Marginal size: 1.3m is 0.0m from ideal 1.3m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 13s is at or above ideal 12s. Long-period groundswell with maximum power.
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 26 km/h from 100° (E). Destroying wave quality. Offshore range: 240°-300°.
  adjustments:
    wind history:
      adjustment: -10
      groomed: false
      morning sickness: true
      explanation: -10 points: Previous days of onshore wind left residual chop ("morning sickness"), reducing wave quality.
    windswell penalty:
      adjustment: -5
      windswell degraded: true
      explanation: -5 points: Short-period windswell is present, creating choppy, disorganized conditions.
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Half Moon Bay. Either swell direction (105°), size (1.3m), or wind (26 km/h from 100°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.3
    height ft: 4.3
    direction degrees: 105
    direction cardinal: ESE
    period s: 13
    explanation: 1.3m (4.3ft) swell from 105° (ESE) at 13s period
  wind:
    speed kmh: 26
    speed mph: 16.2
    direction degrees: 100
    direction cardinal: E
    explanation: 26 km/h (16 mph) from 100° (E)
  windswell:
    height m: 1
    period s: 4
    explanation: Local wind-generated waves (choppy, short-period)

Strike Mission
type: Organization