Surf Forecast for Roca Cuadrada
type: Dataset
description: 10-day surf forecast with Strike Scores for Roca Cuadrada, Matanzas, Chile
about: Roca Cuadrada
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -33.96
    longitude: -71.88
  description: Roca Cuadrada ("Square Rock") is a big wave left reef near Matanzas that comes alive on massive SW swells. Named for a distinctive square-shaped rock, the wave can produce 30-foot faces for tow-in chargers.
summary:
  best day:
    date: 2026-08-10
    score: 30
    category: Poor
    explanation: Best day in the forecast: 2026-08-10 with a score of 30/100 (Poor)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 17/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-04
  day index: 0
  strike score:
    final score: 7
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 8
        out of: 25
        explanation: Poor alignment: Swell from 259° is 34° off optimal 225°, barely within workable range 200°-250°.
      swell size:
        score: 2
        out of: 25
        explanation: Too small: 2.8m is below minimum 4.5m. Waves will be weak/mushy.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 13s is below minimum 16s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 7
        out of: 25
        explanation: Onshore/cross-shore: 12 km/h from 206° (SSW). Destroying wave quality. Offshore range: 70°-110°.
    adjustments:
      wind history:
        adjustment: 0
        groomed: false
        morning sickness: false
        explanation: No significant wind history adjustment.
      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 Roca Cuadrada. Either swell direction (259°), size (2.8m), or wind (12 km/h from 206°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 2.8
      height ft: 9.2
      direction degrees: 259
      direction cardinal: W
      period s: 13
      explanation: 2.8m (9.2ft) swell from 259° (W) at 13s period
    wind:
      speed kmh: 12
      speed mph: 7.5
      direction degrees: 206
      direction cardinal: SSW
      explanation: 12 km/h (7 mph) from 206° (SSW)
    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: 24
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 12
        out of: 25
        explanation: Moderate alignment: Swell from 248° is 23° off optimal 225°, workable but not ideal.
      swell size:
        score: 2
        out of: 25
        explanation: Too small: 2.4m is below minimum 4.5m. Waves will be weak/mushy.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 13s is below minimum 16s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 14
        out of: 25
        explanation: Onshore/cross-shore: 8 km/h from 349° (N). Destroying wave quality. Offshore range: 70°-110°.
    adjustments:
      wind history:
        adjustment: 0
        groomed: false
        morning sickness: false
        explanation: No significant wind history adjustment.
      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 Roca Cuadrada. Either swell direction (248°), size (2.4m), or wind (8 km/h from 349°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 2.4
      height ft: 7.9
      direction degrees: 248
      direction cardinal: WSW
      period s: 13
      explanation: 2.4m (7.9ft) swell from 248° (WSW) at 13s period
    wind:
      speed kmh: 8
      speed mph: 5.0
      direction degrees: 349
      direction cardinal: N
      explanation: 8 km/h (5 mph) from 349° (N)
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: 12
        out of: 25
        explanation: Moderate alignment: Swell from 247° is 22° off optimal 225°, workable but not ideal.
      swell size:
        score: 2
        out of: 25
        explanation: Too small: 3.0m is below minimum 4.5m. Waves will be weak/mushy.
      swell period:
        score: 1
        out of: 25
        explanation: Short period: 11s is below minimum 16s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 9
        out of: 25
        explanation: Onshore/cross-shore: 12 km/h from 179° (S). Destroying wave quality. Offshore range: 70°-110°.
    adjustments:
      wind history:
        adjustment: 0
        groomed: false
        morning sickness: false
        explanation: No significant wind history adjustment.
      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 Roca Cuadrada. Either swell direction (247°), size (3.0m), or wind (12 km/h from 179°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 3
      height ft: 9.8
      direction degrees: 247
      direction cardinal: WSW
      period s: 11
      explanation: 3.0m (9.8ft) swell from 247° (WSW) at 11s period
    wind:
      speed kmh: 12
      speed mph: 7.5
      direction degrees: 179
      direction cardinal: S
      explanation: 12 km/h (7 mph) from 179° (S)
    windswell:
      height m: 0.5
      period s: 3
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-07
  day index: 3
  strike score:
    final score: 11
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 14
        out of: 25
        explanation: Moderate alignment: Swell from 243° is 18° off optimal 225°, workable but not ideal.
      swell size:
        score: 1
        out of: 25
        explanation: Too small: 1.8m is below minimum 4.5m. Waves will be weak/mushy.
    summary: Poor conditions at Roca Cuadrada. Either swell direction (243°), size (1.8m), or wind (13 km/h from 232°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T00:33:38.764Z
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: 2
out of: 25
explanation: Short period: 13s is below minimum 16s. Windswell-dominated (choppy, weak waves).

score: 4
out of: 25
explanation: Onshore/cross-shore: 13 km/h from 232° (SW). Destroying wave quality. Offshore range: 70°-110°.

wind history:
  adjustment: 0
  groomed: false
  morning sickness: false
  explanation: No significant wind history adjustment.
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.

swell:
  height m: 1.8
  height ft: 5.9
  direction degrees: 243
  direction cardinal: WSW
  period s: 13
  explanation: 1.8m (5.9ft) swell from 243° (WSW) at 13s period
wind:
  speed kmh: 13
  speed mph: 8.1
  direction degrees: 232
  direction cardinal: SW
  explanation: 13 km/h (8 mph) from 232° (SW)
secondary swell:
  height m: 0.6
  direction degrees: 231
  direction cardinal: SW
  period s: 14

date: 2026-08-08
day index: 4
strike score:
  final score: 26
  category: Poor
  category emoji: 💤
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 19
      out of: 25
      explanation: Moderate alignment: Swell from 234° is 9° off optimal 225°, workable but not ideal.
    swell size:
      score: 5
      out of: 25
      explanation: Too small: 4.0m is below minimum 4.5m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 15s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 7
      out of: 25
      explanation: Onshore/cross-shore: 12 km/h from 193° (SSW). Destroying wave quality. Offshore range: 70°-110°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    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 Roca Cuadrada. Either swell direction (234°), size (4.0m), or wind (12 km/h from 193°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 4
    height ft: 13.1
    direction degrees: 234
    direction cardinal: SW
    period s: 15
    explanation: 4.0m (13.1ft) swell from 234° (SW) at 15s period
  wind:
    speed kmh: 12
    speed mph: 7.5
    direction degrees: 193
    direction cardinal: SSW
    explanation: 12 km/h (7 mph) from 193° (SSW)

date: 2026-08-09
day index: 5
strike score:
  final score: 13
  category: Poor
  category emoji: 💤
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 20
      out of: 25
      explanation: Good alignment: Swell from 231° is 6° off optimal 225°, still within prime range.
    swell size:
      score: 3
      out of: 25
      explanation: Too small: 3.6m is below minimum 4.5m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 14s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 15 km/h from 190° (S). Destroying wave quality. Offshore range: 70°-110°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    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 Roca Cuadrada. Either swell direction (231°), size (3.6m), or wind (15 km/h from 190°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 3.6
    height ft: 11.8
    direction degrees: 231
    direction cardinal: SW
    period s: 14
    explanation: 3.6m (11.8ft) swell from 231° (SW) at 14s period
  wind:
    speed kmh: 15
    speed mph: 9.3
    direction degrees: 190
    direction cardinal: S
    explanation: 15 km/h (9 mph) from 190° (S)
  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: 30
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 22
      out of: 25
      explanation: Good alignment: Swell from 229° is 4° off optimal 225°, still within prime range.
    swell size:
      score: 2
      out of: 25
      explanation: Too small: 2.3m is below minimum 4.5m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 14s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 12
      out of: 25
      explanation: Onshore/cross-shore: 9 km/h from 202° (SSW). Destroying wave quality. Offshore range: 70°-110°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    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 Roca Cuadrada. Either swell direction (229°), size (2.3m), or wind (9 km/h from 202°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.3
    height ft: 7.5
    direction degrees: 229
    direction cardinal: SW
    period s: 14
    explanation: 2.3m (7.5ft) swell from 229° (SW) at 14s period
  wind:
    speed kmh: 9
    speed mph: 5.6
    direction degrees: 202
    direction cardinal: SSW
    explanation: 9 km/h (6 mph) from 202° (SSW)

date: 2026-08-11
day index: 7
strike score:
  final score: 15
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 23
      out of: 25
      explanation: Good alignment: Swell from 227° is 2° off optimal 225°, still within prime range.
    swell size:
      score: 1
      out of: 25
      explanation: Too small: 1.3m is below minimum 4.5m. Waves will be weak/mushy.
    swell period:
      score: 2
      out of: 25
      explanation: Short period: 13s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 11
      out of: 25
      explanation: Onshore/cross-shore: 10 km/h from 190° (S). Destroying wave quality. Offshore range: 70°-110°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    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 Roca Cuadrada. Either swell direction (227°), size (1.3m), or wind (10 km/h from 190°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.3
    height ft: 4.3
    direction degrees: 227
    direction cardinal: SW
    period s: 13
    explanation: 1.3m (4.3ft) swell from 227° (SW) at 13s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 190
    direction cardinal: S
    explanation: 10 km/h (6 mph) from 190° (S)

date: 2026-08-12
day index: 8
strike score:
  final score: 13
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 7
      out of: 25
      explanation: Poor alignment: Swell from 262° is 37° off optimal 225°, barely within workable range 200°-250°.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 1.0m is below minimum 4.5m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 15s is below minimum 16s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 11
      out of: 25
      explanation: Onshore/cross-shore: 9 km/h from 212° (SSW). Destroying wave quality. Offshore range: 70°-110°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    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 Roca Cuadrada. Either swell direction (262°), size (1.0m), or wind (9 km/h from 212°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 262
    direction cardinal: W
    period s: 15
    explanation: 1.0m (3.3ft) swell from 262° (W) at 15s period
  wind:
    speed kmh: 9
    speed mph: 5.6
    direction degrees: 212
    direction cardinal: SSW
    explanation: 9 km/h (6 mph) from 212° (SSW)
  secondary swell:
    height m: 0.4
    direction degrees: 221
    direction cardinal: SW
    period s: 9
  windswell:
    height m: 0.4
    period s: 2
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-13
day index: 9
strike score:
  final score: 15
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 14
      out of: 25
      explanation: Moderate alignment: Swell from 242° is 17° off optimal 225°, workable but not ideal.
    swell size:
      score: 1
      out of: 25
      explanation: Too small: 1.6m is below minimum 4.5m. Waves will be weak/mushy.
    swell period:
      score: 6
      out of: 25
      explanation: Moderate period: 16s meets minimum 16s but below ideal 20s. Some groundswell energy present.
    wind:
      score: 13
      out of: 25
      explanation: Onshore/cross-shore: 10 km/h from 40° (NE). Destroying wave quality. Offshore range: 70°-110°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    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 Roca Cuadrada. Either swell direction (242°), size (1.6m), or wind (10 km/h from 40°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.6
    height ft: 5.2
    direction degrees: 242
    direction cardinal: WSW
    period s: 16
    explanation: 1.6m (5.2ft) swell from 242° (WSW) at 16s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 40
    direction cardinal: NE
    explanation: 10 km/h (6 mph) from 40° (NE)

Strike Mission
type: Organization