Surf Forecast for Waimea Bay
type: Dataset
description: 10-day surf forecast with Strike Scores for Waimea Bay, North Shore, Oahu, USA
about: Waimea Bay
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: 21.643
    longitude: -158.066
  description: Waimea Bay is the birthplace of big wave surfing—a thundering right-hander that only truly comes alive when swells exceed 15 feet. When it's on, the takeoff is a heart-stopping drop into a churning wall of whitewater. The Eddie Aikau Big Wave Invitational is held here, requiring 20ft+ consistent surf.
summary:
  best day:
    date: 2026-08-04
    score: 0
    category: Poor
    explanation: Best day in the forecast: 2026-08-04 with a score of 0/100 (Poor)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 0/100. 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: 0
        out of: 25
        explanation: No alignment: Swell from 172° is outside workable range 300°-340°. Wrong swell direction for this spot.
      swell size:
        score: 0
        out of: 25
        explanation: Too small: 0.8m is below minimum 4.6m. Waves will be weak/mushy.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 10s is below minimum 14s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 10
        out of: 25
        explanation: Onshore/cross-shore: 12 km/h from 75° (ENE). Destroying wave quality. Offshore range: 90°-160°.
    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 Waimea Bay. Either swell direction (172°), size (0.8m), or wind (12 km/h from 75°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.8
      height ft: 2.6
      direction degrees: 172
      direction cardinal: S
      period s: 10
      explanation: 0.8m (2.6ft) swell from 172° (S) at 10s period
    wind:
      speed kmh: 12
      speed mph: 7.5
      direction degrees: 75
      direction cardinal: ENE
      explanation: 12 km/h (7 mph) from 75° (ENE)
    secondary swell:
      height m: 0.4
      direction degrees: 148
      direction cardinal: SSE
      period s: 12
forecasts:
  date: 2026-08-05
  day index: 1
  strike score:
    final score: 0
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 0
        out of: 25
        explanation: No alignment: Swell from 178° is outside workable range 300°-340°. Wrong swell direction for this spot.
      swell size:
        score: 0
        out of: 25
        explanation: Too small: 0.8m is below minimum 4.6m. Waves will be weak/mushy.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 10s is below minimum 14s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 5
        out of: 25
        explanation: Onshore/cross-shore: 16 km/h from 77° (ENE). Destroying wave quality. Offshore range: 90°-160°.
    adjustments:
      wind history:
        adjustment: -4
        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 Waimea Bay. Either swell direction (178°), size (0.8m), or wind (16 km/h from 77°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.8
      height ft: 2.6
      direction degrees: 178
      direction cardinal: S
      period s: 10
      explanation: 0.8m (2.6ft) swell from 178° (S) at 10s period
    wind:
      speed kmh: 16
      speed mph: 9.9
      direction degrees: 77
      direction cardinal: ENE
      explanation: 16 km/h (10 mph) from 77° (ENE)
    windswell:
      height m: 0.3
      period s: 2
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-06
  day index: 2
  strike score:
    final score: 0
    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 182° is outside workable range 300°-340°. Wrong swell direction for this spot.
      swell size:
        score: 0
        out of: 25
        explanation: Too small: 0.7m is below minimum 4.6m. Waves will be weak/mushy.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 10s is below minimum 14s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 5
        out of: 25
        explanation: Onshore/cross-shore: 16 km/h from 75° (ENE). Destroying wave quality. Offshore range: 90°-160°.
    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 Waimea Bay. Either swell direction (182°), size (0.7m), or wind (16 km/h from 75°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.7
      height ft: 2.3
      direction degrees: 182
      direction cardinal: S
      period s: 10
      explanation: 0.7m (2.3ft) swell from 182° (S) at 10s period
    wind:
      speed kmh: 16
      speed mph: 9.9
      direction degrees: 75
      direction cardinal: ENE
      explanation: 16 km/h (10 mph) from 75° (ENE)
    secondary swell:
      height m: 0.4
      direction degrees: 325
      direction cardinal: NW
      period s: 8
    windswell:
      height m: 0.3
      period s: 2
      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)
    summary: Poor conditions at Waimea Bay. Either swell direction (188°), size (0.7m), or wind (17 km/h from 78°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T01:20:06.632Z
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 188° is outside workable range 300°-340°. Wrong swell direction for this spot.
swell size:
  score: 0
  out of: 25
  explanation: Too small: 0.7m is below minimum 4.6m. Waves will be weak/mushy.
swell period:
  score: 4
  out of: 25
  explanation: Short period: 13s is below minimum 14s. Windswell-dominated (choppy, weak waves).
wind:
  score: 5
  out of: 25
  explanation: Onshore/cross-shore: 17 km/h from 78° (ENE). Destroying wave quality. Offshore range: 90°-160°.

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.

swell:
  height m: 0.7
  height ft: 2.3
  direction degrees: 188
  direction cardinal: S
  period s: 13
  explanation: 0.7m (2.3ft) swell from 188° (S) at 13s period
wind:
  speed kmh: 17
  speed mph: 10.6
  direction degrees: 78
  direction cardinal: ENE
  explanation: 17 km/h (11 mph) from 78° (ENE)
windswell:
  height m: 0.4
  period s: 2
  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: 0
      out of: 25
      explanation: No alignment: Swell from 189° is outside workable range 300°-340°. Wrong swell direction for this spot.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 0.9m is below minimum 4.6m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 12s is below minimum 14s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 19 km/h from 77° (ENE). Destroying wave quality. Offshore range: 90°-160°.
  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 Waimea Bay. Either swell direction (189°), size (0.9m), or wind (19 km/h from 77°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.9
    height ft: 3.0
    direction degrees: 189
    direction cardinal: S
    period s: 12
    explanation: 0.9m (3.0ft) swell from 189° (S) at 12s period
  wind:
    speed kmh: 19
    speed mph: 11.8
    direction degrees: 77
    direction cardinal: ENE
    explanation: 19 km/h (12 mph) from 77° (ENE)
  secondary swell:
    height m: 0.4
    direction degrees: 44
    direction cardinal: NE
    period s: 6
  windswell:
    height m: 0.6
    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: 0
      out of: 25
      explanation: No alignment: Swell from 181° is outside workable range 300°-340°. Wrong swell direction for this spot.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 1.0m is below minimum 4.6m. Waves will be weak/mushy.
    swell period:
      score: 2
      out of: 25
      explanation: Short period: 10s is below minimum 14s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 20 km/h from 72° (ENE). Destroying wave quality. Offshore range: 90°-160°.
  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 Waimea Bay. Either swell direction (181°), size (1.0m), or wind (20 km/h from 72°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 181
    direction cardinal: S
    period s: 10
    explanation: 1.0m (3.3ft) swell from 181° (S) at 10s period
  wind:
    speed kmh: 20
    speed mph: 12.4
    direction degrees: 72
    direction cardinal: ENE
    explanation: 20 km/h (12 mph) from 72° (ENE)
  secondary swell:
    height m: 0.4
    direction degrees: 136
    direction cardinal: SE
    period s: 12
  windswell:
    height m: 0.7
    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: 0
      out of: 25
      explanation: No alignment: Swell from 161° is outside workable range 300°-340°. Wrong swell direction for this spot.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 1.0m is below minimum 4.6m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 12s is below minimum 14s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 17 km/h from 75° (ENE). Destroying wave quality. Offshore range: 90°-160°.
  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 Waimea Bay. Either swell direction (161°), size (1.0m), or wind (17 km/h from 75°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 161
    direction cardinal: SSE
    period s: 12
    explanation: 1.0m (3.3ft) swell from 161° (SSE) at 12s period
  wind:
    speed kmh: 17
    speed mph: 10.6
    direction degrees: 75
    direction cardinal: ENE
    explanation: 17 km/h (11 mph) from 75° (ENE)
  secondary swell:
    height m: 0.5
    direction degrees: 86
    direction cardinal: E
    period s: 9
  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: 0
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 0
      out of: 25
      explanation: No alignment: Swell from 190° is outside workable range 300°-340°. Wrong swell direction for this spot.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 1.0m is below minimum 4.6m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 13s is below minimum 14s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 18 km/h from 77° (ENE). Destroying wave quality. Offshore range: 90°-160°.
  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 Waimea Bay. Either swell direction (190°), size (1.0m), or wind (18 km/h from 77°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 190
    direction cardinal: S
    period s: 13
    explanation: 1.0m (3.3ft) swell from 190° (S) at 13s period
  wind:
    speed kmh: 18
    speed mph: 11.2
    direction degrees: 77
    direction cardinal: ENE
    explanation: 18 km/h (11 mph) from 77° (ENE)
  windswell:
    height m: 0.5
    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: 0
      out of: 25
      explanation: No alignment: Swell from 191° is outside workable range 300°-340°. Wrong swell direction for this spot.
    swell size:
      score: 1
      out of: 25
      explanation: Too small: 1.3m is below minimum 4.6m. Waves will be weak/mushy.
    swell period:
      score: 8
      out of: 25
      explanation: Moderate period: 15s meets minimum 14s but below ideal 18s. Some groundswell energy present.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 16 km/h from 73° (ENE). Destroying wave quality. Offshore range: 90°-160°.
  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 Waimea Bay. Either swell direction (191°), size (1.3m), or wind (16 km/h from 73°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.3
    height ft: 4.3
    direction degrees: 191
    direction cardinal: S
    period s: 15
    explanation: 1.3m (4.3ft) swell from 191° (S) at 15s period
  wind:
    speed kmh: 16
    speed mph: 9.9
    direction degrees: 73
    direction cardinal: ENE
    explanation: 16 km/h (10 mph) from 73° (ENE)
  secondary swell:
    height m: 0.6
    direction degrees: 137
    direction cardinal: SE
    period s: 11
  windswell:
    height m: 0.4
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-13
day index: 9
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: 0
      out of: 25
      explanation: No alignment: Swell from 188° is outside workable range 300°-340°. Wrong swell direction for this spot.
    swell size:
      score: 1
      out of: 25
      explanation: Too small: 1.6m is below minimum 4.6m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 13s is below minimum 14s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 19 km/h from 76° (ENE). Destroying wave quality. Offshore range: 90°-160°.
  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 Waimea Bay. Either swell direction (188°), size (1.6m), or wind (19 km/h from 76°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.6
    height ft: 5.2
    direction degrees: 188
    direction cardinal: S
    period s: 13
    explanation: 1.6m (5.2ft) swell from 188° (S) at 13s period
  wind:
    speed kmh: 19
    speed mph: 11.8
    direction degrees: 76
    direction cardinal: ENE
    explanation: 19 km/h (12 mph) from 76° (ENE)
  secondary swell:
    height m: 0.4
    direction degrees: 143
    direction cardinal: SE
    period s: 7
  windswell:
    height m: 0.4
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

Strike Mission
type: Organization