Surf Forecast for Laje do Shock
type: Dataset
description: 10-day surf forecast with Strike Scores for Laje do Shock, Niterói, RJ, Brazil
about: Laje do Shock
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -22.975
    longitude: -43.025
  description: Laje do Shock is one of the most dangerous waves in Brazil, a shallow slab near Itacoatiara that breaks over just 3 feet of water. The wave only works on large SW swells and produces thick, square barrels that detonate with terrifying force. Only a handful of surfers have the skill and courage to ride this wave, as the consequences of a wipeout are severe - the shallow rock shelf has ended sessions and careers. This is strictly expert territory.
summary:
  best day:
    date: 2026-08-09
    score: 44
    category: Poor
    explanation: Best day in the forecast: 2026-08-09 with a score of 44/100 (Poor)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 19/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-04
  day index: 0
  strike score:
    final score: 13
    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 166° is 36° off optimal 202°, barely within workable range 180°-247°.
      swell size:
        score: 1
        out of: 25
        explanation: Too small: 0.9m is below minimum 2.5m. Waves will be weak/mushy.
      swell period:
        score: 4
        out of: 25
        explanation: Short period: 11s is below minimum 12s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 14
        out of: 25
        explanation: Onshore/cross-shore: 8 km/h from 104° (ESE). Destroying wave quality. Offshore range: 315°-45°.
    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 Laje do Shock. Either swell direction (166°), size (0.9m), or wind (8 km/h from 104°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.9
      height ft: 3.0
      direction degrees: 166
      direction cardinal: SSE
      period s: 11
      explanation: 0.9m (3.0ft) swell from 166° (SSE) at 11s period
    wind:
      speed kmh: 8
      speed mph: 5.0
      direction degrees: 104
      direction cardinal: ESE
      explanation: 8 km/h (5 mph) from 104° (ESE)
    secondary swell:
      height m: 0.6
      direction degrees: 150
      direction cardinal: SSE
      period s: 10
forecasts:
  date: 2026-08-05
  day index: 1
  strike score:
    final score: 15
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 13
        out of: 25
        explanation: Moderate alignment: Swell from 182° is 20° off optimal 202°, workable but not ideal.
      swell size:
        score: 1
        out of: 25
        explanation: Too small: 1.2m is below minimum 2.5m. Waves will be weak/mushy.
      swell period:
        score: 8
        out of: 25
        explanation: Moderate period: 13s meets minimum 12s but below ideal 16s. Some groundswell energy present.
      wind:
        score: 18
        out of: 25
        explanation: Onshore/cross-shore: 8 km/h from 57° (ENE). Destroying wave quality. Offshore range: 315°-45°.
    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 Laje do Shock. Either swell direction (182°), size (1.2m), or wind (8 km/h from 57°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1.2
      height ft: 3.9
      direction degrees: 182
      direction cardinal: S
      period s: 13
      explanation: 1.2m (3.9ft) swell from 182° (S) at 13s period
    wind:
      speed kmh: 8
      speed mph: 5.0
      direction degrees: 57
      direction cardinal: ENE
      explanation: 8 km/h (5 mph) from 57° (ENE)
    secondary swell:
      height m: 0.9
      direction degrees: 106
      direction cardinal: ESE
      period s: 6
forecasts:
  date: 2026-08-06
  day index: 2
  strike score:
    final score: 8
    category: Poor
    category emoji: 💤
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 0
        out of: 25
        explanation: No alignment: Swell from 101° is outside workable range 180°-247°. Wrong swell direction for this spot.
      swell size:
        score: 1
        out of: 25
        explanation: Too small: 1.0m is below minimum 2.5m. Waves will be weak/mushy.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 9s is below minimum 12s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 25
        out of: 25
        explanation: Light offshore: 7 km/h from 16° (NNE). Grooming the wave face beautifully.
    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 Laje do Shock. Either swell direction (101°), size (1.0m), or wind (7 km/h from 16°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1
      height ft: 3.3
      direction degrees: 101
      direction cardinal: E
      period s: 9
      explanation: 1.0m (3.3ft) swell from 101° (E) at 9s period
    wind:
      speed kmh: 7
      speed mph: 4.3
      direction degrees: 16
      direction cardinal: NNE
      explanation: 7 km/h (4 mph) from 16° (NNE)
    secondary swell:
      height m: 0.6
      direction degrees: 176
      direction cardinal: S
      period s: 9
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)
    summary: Poor conditions at Laje do Shock. Either swell direction (98°), size (0.9m), or wind (10 km/h from 321°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T00:35:33.682Z
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)

swell direction:
  score: 0
  out of: 25
  explanation: No alignment: Swell from 98° is outside workable range 180°-247°. Wrong swell direction for this spot.
swell size:
  score: 1
  out of: 25
  explanation: Too small: 0.9m is below minimum 2.5m. Waves will be weak/mushy.
swell period:
  score: 2
  out of: 25
  explanation: Short period: 9s is below minimum 12s. Windswell-dominated (choppy, weak waves).
wind:
  score: 17
  out of: 25
  explanation: Moderate offshore: 10 km/h from 321° (NW). Still grooming but noticeable wind.

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: 0.9
  height ft: 3.0
  direction degrees: 98
  direction cardinal: E
  period s: 9
  explanation: 0.9m (3.0ft) swell from 98° (E) at 9s period
wind:
  speed kmh: 10
  speed mph: 6.2
  direction degrees: 321
  direction cardinal: NW
  explanation: 10 km/h (6 mph) from 321° (NW)
secondary swell:
  height m: 0.5
  direction degrees: 168
  direction cardinal: SSE
  period s: 9

date: 2026-08-08
day index: 4
strike score:
  final score: 15
  category: Poor
  category emoji: 💤
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 14
      out of: 25
      explanation: Moderate alignment: Swell from 184° is 18° off optimal 202°, workable but not ideal.
    swell size:
      score: 1
      out of: 25
      explanation: Too small: 1.1m is below minimum 2.5m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 11s is below minimum 12s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 13
      out of: 25
      explanation: Onshore/cross-shore: 10 km/h from 90° (E). Destroying wave quality. Offshore range: 315°-45°.
  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 Laje do Shock. Either swell direction (184°), size (1.1m), or wind (10 km/h from 90°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.1
    height ft: 3.6
    direction degrees: 184
    direction cardinal: S
    period s: 11
    explanation: 1.1m (3.6ft) swell from 184° (S) at 11s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 90
    direction cardinal: E
    explanation: 10 km/h (6 mph) from 90° (E)
  secondary swell:
    height m: 0.5
    direction degrees: 130
    direction cardinal: SE
    period s: 8

date: 2026-08-09
day index: 5
strike score:
  final score: 44
  category: Poor
  category emoji: 💤
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 17
      out of: 25
      explanation: Moderate alignment: Swell from 191° is 11° off optimal 202°, workable but not ideal.
    swell size:
      score: 3
      out of: 25
      explanation: Too small: 1.8m is below minimum 2.5m. Waves will be weak/mushy.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 14s meets minimum 12s but below ideal 16s. Some groundswell energy present.
    wind:
      score: 15
      out of: 25
      explanation: Onshore/cross-shore: 7 km/h from 181° (S). Destroying wave quality. Offshore range: 315°-45°.
  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 Laje do Shock. Either swell direction (191°), size (1.8m), or wind (7 km/h from 181°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.8
    height ft: 5.9
    direction degrees: 191
    direction cardinal: S
    period s: 14
    explanation: 1.8m (5.9ft) swell from 191° (S) at 14s period
  wind:
    speed kmh: 7
    speed mph: 4.3
    direction degrees: 181
    direction cardinal: S
    explanation: 7 km/h (4 mph) from 181° (S)
  secondary swell:
    height m: 0.6
    direction degrees: 164
    direction cardinal: SSE
    period s: 10

date: 2026-08-10
day index: 6
strike score:
  final score: 16
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 14
      out of: 25
      explanation: Moderate alignment: Swell from 185° is 17° off optimal 202°, workable but not ideal.
    swell size:
      score: 3
      out of: 25
      explanation: Too small: 1.9m is below minimum 2.5m. Waves will be weak/mushy.
    swell period:
      score: 8
      out of: 25
      explanation: Moderate period: 13s meets minimum 12s but below ideal 16s. Some groundswell energy present.
    wind:
      score: 4
      out of: 25
      explanation: Onshore/cross-shore: 13 km/h from 192° (SSW). Destroying wave quality. Offshore range: 315°-45°.
  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 Laje do Shock. Either swell direction (185°), size (1.9m), or wind (13 km/h from 192°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.9
    height ft: 6.2
    direction degrees: 185
    direction cardinal: S
    period s: 13
    explanation: 1.9m (6.2ft) swell from 185° (S) at 13s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 192
    direction cardinal: SSW
    explanation: 13 km/h (8 mph) from 192° (SSW)
  secondary swell:
    height m: 0.5
    direction degrees: 167
    direction cardinal: SSE
    period s: 11
  windswell:
    height m: 0.5
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-11
day index: 7
strike score:
  final score: 25
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 18
      out of: 25
      explanation: Moderate alignment: Swell from 192° is 10° off optimal 202°, workable but not ideal.
    swell size:
      score: 5
      out of: 25
      explanation: Too small: 2.3m is below minimum 2.5m. Waves will be weak/mushy.
    swell period:
      score: 8
      out of: 25
      explanation: Moderate period: 13s meets minimum 12s but below ideal 16s. Some groundswell energy present.
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 13 km/h from 113° (ESE). Destroying wave quality. Offshore range: 315°-45°.
  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 Laje do Shock. Either swell direction (192°), size (2.3m), or wind (13 km/h from 113°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.3
    height ft: 7.5
    direction degrees: 192
    direction cardinal: SSW
    period s: 13
    explanation: 2.3m (7.5ft) swell from 192° (SSW) at 13s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 113
    direction cardinal: ESE
    explanation: 13 km/h (8 mph) from 113° (ESE)
  secondary swell:
    height m: 0.6
    direction degrees: 116
    direction cardinal: ESE
    period s: 5
  windswell:
    height m: 0.3
    period s: 2
    explanation: Local wind-generated waves (choppy, short-period)

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: 13
      out of: 25
      explanation: Moderate alignment: Swell from 182° is 20° off optimal 202°, workable but not ideal.
    swell size:
      score: 3
      out of: 25
      explanation: Too small: 1.9m is below minimum 2.5m. Waves will be weak/mushy.
    swell period:
      score: 6
      out of: 25
      explanation: Moderate period: 12s meets minimum 12s but below ideal 16s. Some groundswell energy present.
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 13 km/h from 99° (E). Destroying wave quality. Offshore range: 315°-45°.
  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 Laje do Shock. Either swell direction (182°), size (1.9m), or wind (13 km/h from 99°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.9
    height ft: 6.2
    direction degrees: 182
    direction cardinal: S
    period s: 12
    explanation: 1.9m (6.2ft) swell from 182° (S) at 12s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 99
    direction cardinal: E
    explanation: 13 km/h (8 mph) from 99° (E)
  secondary swell:
    height m: 1
    direction degrees: 175
    direction cardinal: S
    period s: 10
  windswell:
    height m: 0.5
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-13
day index: 9
strike score:
  final score: 40
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 15
      out of: 25
      explanation: Moderate alignment: Swell from 186° is 16° off optimal 202°, workable but not ideal.
    swell size:
      score: 8
      out of: 25
      explanation: Marginal size: 2.5m is 2.3m from ideal 4.8m.
    swell period:
      score: 6
      out of: 25
      explanation: Moderate period: 12s meets minimum 12s but below ideal 16s. Some groundswell energy present.
    wind:
      score: 20
      out of: 25
      explanation: Onshore/cross-shore: 7 km/h from 50° (NE). Destroying wave quality. Offshore range: 315°-45°.
  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 Laje do Shock. Either swell direction (186°), size (2.5m), or wind (7 km/h from 50°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.5
    height ft: 8.2
    direction degrees: 186
    direction cardinal: S
    period s: 12
    explanation: 2.5m (8.2ft) swell from 186° (S) at 12s period
  wind:
    speed kmh: 7
    speed mph: 4.3
    direction degrees: 50
    direction cardinal: NE
    explanation: 7 km/h (4 mph) from 50° (NE)
  secondary swell:
    height m: 0.9
    direction degrees: 101
    direction cardinal: E
    period s: 4
  windswell:
    height m: 0.3
    period s: 2
    explanation: Local wind-generated waves (choppy, short-period)

Strike Mission
type: Organization