Surf Forecast for Marwick Bay
type: Dataset
description: 10-day surf forecast with Strike Scores for Marwick Bay, Orkney Islands, UK
about: Marwick Bay
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: 59.0833
    longitude: -3.35
  description: Marwick Bay is one of Orkney's most exposed surf spots--a right-hand reef on the west coast wide open to the North Atlantic.
summary:
  best day:
    date: 2026-08-11
    score: 23
    category: Poor
    explanation: Best day in the forecast: 2026-08-11 with a score of 23/100 (Poor)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 5/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-05
  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: 4
        out of: 25
        explanation: Poor alignment: Swell from 350° is 50° off optimal 300°, barely within workable range 260°-340°.
      swell size:
        score: 8
        out of: 25
        explanation: Marginal size: 1.0m is 0.8m from ideal 1.8m.
      swell period:
        score: 4
        out of: 25
        explanation: Short period: 8s is below minimum 9s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 1
        out of: 25
        explanation: Onshore/cross-shore: 25 km/h from 51° (NE). Destroying wave quality. Offshore range: 70°-140°.
    adjustments:
      wind history:
        adjustment: 0
        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 Marwick Bay. Either swell direction (350°), size (1.0m), or wind (25 km/h from 51°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1
      height ft: 3.3
      direction degrees: 350
      direction cardinal: N
      period s: 8
      peak period s: 8.1
      explanation: 1.0m (3.3ft) swell from 350° (N) at 8.1s period
    wind:
      speed kmh: 25
      speed mph: 15.5
      direction degrees: 51
      direction cardinal: NE
      explanation: 25 km/h (16 mph) from 51° (NE)
    windswell:
      height m: 1.3
      period s: 4
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-06
  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 359° is outside workable range 260°-340°. Wrong swell direction for this spot.
      swell size:
        score: 9
        out of: 25
        explanation: Marginal size: 1.1m is 0.6m from ideal 1.8m.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 7s is below minimum 9s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 24 km/h from 310° (NW). Destroying wave quality. Offshore range: 70°-140°.
    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: -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 Marwick Bay. Either swell direction (359°), size (1.1m), or wind (24 km/h from 310°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1.1
      height ft: 3.6
      direction degrees: 359
      direction cardinal: N
      period s: 7
      peak period s: 7
      explanation: 1.1m (3.6ft) swell from 359° (N) at 7s period
    wind:
      speed kmh: 24
      speed mph: 14.9
      direction degrees: 310
      direction cardinal: NW
      explanation: 24 km/h (15 mph) from 310° (NW)
    windswell:
      height m: 0.7
      period s: 3
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-07
  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: 10
        out of: 25
        explanation: Moderate alignment: Swell from 272° is 28° off optimal 300°, workable but not ideal.
      swell size:
        score: 11
        out of: 25
        explanation: Marginal size: 1.3m is 0.4m from ideal 1.8m.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 7s is below minimum 9s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 1
        out of: 25
        explanation: Onshore/cross-shore: 20 km/h from 194° (SSW). Destroying wave quality. Offshore range: 70°-140°.
    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 Marwick Bay. Either swell direction (272°), size (1.3m), or wind (20 km/h from 194°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1.3
      height ft: 4.3
      direction degrees: 272
      direction cardinal: W
      period s: 7
      peak period s: 7.3
      explanation: 1.3m (4.3ft) swell from 272° (W) at 7.3s period
    wind:
      speed kmh: 20
      speed mph: 12.4
      direction degrees: 194
      direction cardinal: SSW
      explanation: 20 km/h (12 mph) from 194° (SSW)
    windswell:
      height m: 0.8
      period s: 3
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 20
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    summary: Poor conditions at Marwick Bay. Either swell direction (265°), size (2.0m), or wind (14 km/h from 222°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T04:15:21.810Z
temporal coverage: 2026-08-05/2026-08-14
data sources: Open-Meteo Marine API (swell/wave data)
data sources: Open-Meteo Weather API (wind/weather data)

swell direction:
  score: 8
  out of: 25
  explanation: Poor alignment: Swell from 265° is 35° off optimal 300°, barely within workable range 260°-340°.
swell size:
  score: 23
  out of: 25
  explanation: Good size: 2.0m is within 15% of ideal 1.8m.
swell period:
  score: 6
  out of: 25
  explanation: Moderate period: 9s meets minimum 9s but below ideal 13s. Some groundswell energy present.
wind:
  score: 3
  out of: 25
  explanation: Onshore/cross-shore: 14 km/h from 222° (SW). Destroying wave quality. Offshore range: 70°-140°.

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.

swell:
  height m: 2
  height ft: 6.6
  direction degrees: 265
  direction cardinal: W
  period s: 9
  peak period s: 9.3
  explanation: 2.0m (6.6ft) swell from 265° (W) at 9.3s period
wind:
  speed kmh: 14
  speed mph: 8.7
  direction degrees: 222
  direction cardinal: SW
  explanation: 14 km/h (9 mph) from 222° (SW)
windswell:
  height m: 0.6
  period s: 3
  explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-09
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: 9
      out of: 25
      explanation: Poor alignment: Swell from 268° is 32° off optimal 300°, barely within workable range 260°-340°.
    swell size:
      score: 10
      out of: 25
      explanation: Marginal size: 1.2m is 0.6m from ideal 1.8m.
    swell period:
      score: 2
      out of: 25
      explanation: Short period: 7s is below minimum 9s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 28 km/h from 270° (W). Destroying wave quality. Offshore range: 70°-140°.
  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 Marwick Bay. Either swell direction (268°), size (1.2m), or wind (28 km/h from 270°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.2
    height ft: 3.9
    direction degrees: 268
    direction cardinal: W
    period s: 7
    explanation: 1.2m (3.9ft) swell from 268° (W) at 7s period
  wind:
    speed kmh: 28
    speed mph: 17.4
    direction degrees: 270
    direction cardinal: W
    explanation: 28 km/h (17 mph) from 270° (W)

date: 2026-08-10
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: 21
      out of: 25
      explanation: Good alignment: Swell from 295° is 5° off optimal 300°, still within prime range.
    swell size:
      score: 5
      out of: 25
      explanation: Too small: 0.9m is below minimum 1.0m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 8s is below minimum 9s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 15 km/h from 351° (N). Destroying wave quality. Offshore range: 70°-140°.
  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: -10
      windswell degraded: true
      explanation: -10 points: Short-period windswell is present, creating choppy, disorganized conditions.
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Marwick Bay. Either swell direction (295°), size (0.9m), or wind (15 km/h from 351°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.9
    height ft: 3.0
    direction degrees: 295
    direction cardinal: WNW
    period s: 8
    explanation: 0.9m (3.0ft) swell from 295° (WNW) at 8s period
  wind:
    speed kmh: 15
    speed mph: 9.3
    direction degrees: 351
    direction cardinal: N
    explanation: 15 km/h (9 mph) from 351° (N)
  secondary swell:
    height m: 0.4
    direction degrees: 288
    direction cardinal: WNW
    period s: 7
  windswell:
    height m: 1.9
    period s: 5
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-11
day index: 6
strike score:
  final score: 23
  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 282° is 18° off optimal 300°, workable but not ideal.
    swell size:
      score: 23
      out of: 25
      explanation: Good size: 2.0m is within 15% of ideal 1.8m.
    swell period:
      score: 2
      out of: 25
      explanation: Short period: 7s is below minimum 9s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 15 km/h from 147° (SSE). Destroying wave quality. Offshore range: 70°-140°.
  adjustments:
    wind history:
      adjustment: -7
      groomed: false
      morning sickness: true
      explanation: -7 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 Marwick Bay. Either swell direction (282°), size (2.0m), or wind (15 km/h from 147°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2
    height ft: 6.6
    direction degrees: 282
    direction cardinal: WNW
    period s: 7
    explanation: 2.0m (6.6ft) swell from 282° (WNW) at 7s period
  wind:
    speed kmh: 15
    speed mph: 9.3
    direction degrees: 147
    direction cardinal: SSE
    explanation: 15 km/h (9 mph) from 147° (SSE)
  windswell:
    height m: 0.5
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-12
day index: 7
strike score:
  final score: 2
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 14
      out of: 25
      explanation: Moderate alignment: Swell from 282° is 18° off optimal 300°, workable but not ideal.
    swell size:
      score: 3
      out of: 25
      explanation: Too small: 0.7m is below minimum 1.0m. Waves will be weak/mushy.
    swell period:
      score: 2
      out of: 25
      explanation: Short period: 7s is below minimum 9s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 14 km/h from 185° (S). Destroying wave quality. Offshore range: 70°-140°.
  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 Marwick Bay. Either swell direction (282°), size (0.7m), or wind (14 km/h from 185°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.7
    height ft: 2.3
    direction degrees: 282
    direction cardinal: WNW
    period s: 7
    explanation: 0.7m (2.3ft) swell from 282° (WNW) at 7s period
  wind:
    speed kmh: 14
    speed mph: 8.7
    direction degrees: 185
    direction cardinal: S
    explanation: 14 km/h (9 mph) from 185° (S)
  windswell:
    height m: 0.3
    period s: 2
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-13
day index: 8
strike score:
  final score: 6
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 21
      out of: 25
      explanation: Good alignment: Swell from 305° is 5° off optimal 300°, still within prime range.
    swell size:
      score: 2
      out of: 25
      explanation: Too small: 0.5m is below minimum 1.0m. Waves will be weak/mushy.
    swell period:
      score: 6
      out of: 25
      explanation: Moderate period: 9s meets minimum 9s but below ideal 13s. Some groundswell energy present.
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 40 km/h from 262° (W). Destroying wave quality. Offshore range: 70°-140°.
  adjustments:
    wind history:
      adjustment: 0
      groomed: false
      morning sickness: false
      explanation: No significant wind history adjustment.
    windswell penalty:
      adjustment: -10
      windswell degraded: true
      explanation: -10 points: Short-period windswell is present, creating choppy, disorganized conditions.
    secondary swell bonus:
      adjustment: 0
      explanation: No secondary swell bonus.
  summary: Poor conditions at Marwick Bay. Either swell direction (305°), size (0.5m), or wind (40 km/h from 262°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.5
    height ft: 1.6
    direction degrees: 305
    direction cardinal: NW
    period s: 9
    explanation: 0.5m (1.6ft) swell from 305° (NW) at 9s period
  wind:
    speed kmh: 40
    speed mph: 24.9
    direction degrees: 262
    direction cardinal: W
    explanation: 40 km/h (25 mph) from 262° (W)
  windswell:
    height m: 2.1
    period s: 6
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-14
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 0° is outside workable range 260°-340°. Wrong swell direction for this spot.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 0.0m is below minimum 1.0m. Waves will be weak/mushy.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 11s meets minimum 9s but below ideal 13s. Some groundswell energy present.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 15 km/h from 233° (SW). Destroying wave quality. Offshore range: 70°-140°.
  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: 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 Marwick Bay. Either swell direction (0°), size (0.0m), or wind (15 km/h from 233°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0
    height ft: 0.0
    direction degrees: 0
    direction cardinal: N
    period s: 11
    explanation: 0.0m (0.0ft) swell from 0° (N) at 11s period
  wind:
    speed kmh: 15
    speed mph: 9.3
    direction degrees: 233
    direction cardinal: SW
    explanation: 15 km/h (9 mph) from 233° (SW)

Strike Mission
type: Organization