Surf Forecast for Porth Neigwl
type: Dataset
description: 10-day surf forecast with Strike Scores for Porth Neigwl, Lleyn Peninsula, North Wales, UK
about: Porth Neigwl
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: 52.8167
    longitude: -4.55
  description: Porth Neigwl--or Hell's Mouth--is a sweeping 3-mile beach on the Lleyn Peninsula that catches SW-S swells.
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: 15
        out of: 25
        explanation: Moderate alignment: Swell from 226° is 16° off optimal 210°, workable but not ideal.
      swell size:
        score: 2
        out of: 25
        explanation: Too small: 0.6m is below minimum 1.0m. Waves will be weak/mushy.
      swell period:
        score: 2
        out of: 25
        explanation: Short period: 6s is below minimum 8s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 22 km/h from 202° (SSW). Destroying wave quality. Offshore range: 350°-60°.
    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 Porth Neigwl. Either swell direction (226°), size (0.6m), or wind (22 km/h from 202°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.6
      height ft: 2.0
      direction degrees: 226
      direction cardinal: SW
      period s: 6
      peak period s: 6
      explanation: 0.6m (2.0ft) swell from 226° (SW) at 6s period
    wind:
      speed kmh: 22
      speed mph: 13.7
      direction degrees: 202
      direction cardinal: SSW
      explanation: 22 km/h (14 mph) from 202° (SSW)
    windswell:
      height m: 0.8
      period s: 3
      explanation: Local wind-generated waves (choppy, short-period)
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: 20
        out of: 25
        explanation: Good alignment: Swell from 216° is 6° off optimal 210°, still within prime range.
      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: 6s is below minimum 8s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 31 km/h from 262° (W). Destroying wave quality. Offshore range: 350°-60°.
    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: -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 Porth Neigwl. Either swell direction (216°), size (0.7m), or wind (31 km/h from 262°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.7
      height ft: 2.3
      direction degrees: 216
      direction cardinal: SW
      period s: 6
      peak period s: 5.8
      explanation: 0.7m (2.3ft) swell from 216° (SW) at 5.8s period
    wind:
      speed kmh: 31
      speed mph: 19.3
      direction degrees: 262
      direction cardinal: W
      explanation: 31 km/h (19 mph) from 262° (W)
    windswell:
      height m: 1
      period s: 4
      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: 7
        out of: 25
        explanation: Poor alignment: Swell from 248° is 38° off optimal 210°, barely within workable range 190°-250°.
      swell size:
        score: 2
        out of: 25
        explanation: Too small: 0.6m is below minimum 1.0m. Waves will be weak/mushy.
      swell period:
        score: 1
        out of: 25
        explanation: Short period: 5s is below minimum 8s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 1
        out of: 25
        explanation: Onshore/cross-shore: 20 km/h from 283° (WNW). Destroying wave quality. Offshore range: 350°-60°.
    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 Porth Neigwl. Either swell direction (248°), size (0.6m), or wind (20 km/h from 283°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.6
      height ft: 2.0
      direction degrees: 248
      direction cardinal: WSW
      period s: 5
      peak period s: 5.3
      explanation: 0.6m (2.0ft) swell from 248° (WSW) at 5.3s period
    wind:
      speed kmh: 20
      speed mph: 12.4
      direction degrees: 283
      direction cardinal: WNW
      explanation: 20 km/h (12 mph) from 283° (WNW)
    secondary swell:
      height m: 0.4
      direction degrees: 328
      direction cardinal: NNW
      period s: 4
    windswell:
      height m: 0.4
      period s: 2
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-07
  day index: 3
provider: Strike Mission
date published: 2026-08-05T03:11:58.758Z
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)

final score: 0
category: Poor
category emoji: 💤
confidence: 0.92
confidence explanation: High confidence (2-3 day forecast)
breakdown:
  swell direction:
    score: 10
    out of: 25
    explanation: Moderate alignment: Swell from 237° is 27° off optimal 210°, workable but not ideal.
  swell size:
    score: 1
    out of: 25
    explanation: Too small: 0.3m is below minimum 1.0m. Waves will be weak/mushy.
  swell period:
    score: 0
    out of: 25
    explanation: Short period: 4s is below minimum 8s. Windswell-dominated (choppy, weak waves).
  wind:
    score: 10
    out of: 25
    explanation: Onshore/cross-shore: 10 km/h from 248° (WSW). Destroying wave quality. Offshore range: 350°-60°.
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: -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 Porth Neigwl. Either swell direction (237°), size (0.3m), or wind (10 km/h from 248°) is unfavorable. Consider other spots or wait for better conditions.

swell:
  height m: 0.3
  height ft: 1.0
  direction degrees: 237
  direction cardinal: WSW
  period s: 4
  peak period s: 3.6
  explanation: 0.3m (1.0ft) swell from 237° (WSW) at 3.6s period
wind:
  speed kmh: 10
  speed mph: 6.2
  direction degrees: 248
  direction cardinal: WSW
  explanation: 10 km/h (6 mph) from 248° (WSW)

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: 10
      out of: 25
      explanation: Moderate alignment: Swell from 238° is 28° off optimal 210°, workable but not ideal.
    swell size:
      score: 0
      out of: 25
      explanation: Too small: 0.2m is below minimum 1.0m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 7s is below minimum 8s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 25 km/h from 206° (SSW). Destroying wave quality. Offshore range: 350°-60°.
  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 Porth Neigwl. Either swell direction (238°), size (0.2m), or wind (25 km/h from 206°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.2
    height ft: 0.7
    direction degrees: 238
    direction cardinal: WSW
    period s: 7
    explanation: 0.2m (0.7ft) swell from 238° (WSW) at 7s period
  wind:
    speed kmh: 25
    speed mph: 15.5
    direction degrees: 206
    direction cardinal: SSW
    explanation: 25 km/h (16 mph) from 206° (SSW)

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: 15
      out of: 25
      explanation: Moderate alignment: Swell from 225° is 15° off optimal 210°, workable but not ideal.
    swell size:
      score: 2
      out of: 25
      explanation: Too small: 0.6m is below minimum 1.0m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 7s is below minimum 8s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 26 km/h from 252° (WSW). Destroying wave quality. Offshore range: 350°-60°.
  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 Porth Neigwl. Either swell direction (225°), size (0.6m), or wind (26 km/h from 252°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.6
    height ft: 2.0
    direction degrees: 225
    direction cardinal: SW
    period s: 7
    explanation: 0.6m (2.0ft) swell from 225° (SW) at 7s period
  wind:
    speed kmh: 26
    speed mph: 16.2
    direction degrees: 252
    direction cardinal: WSW
    explanation: 26 km/h (16 mph) from 252° (WSW)
  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: 14
      out of: 25
      explanation: Moderate alignment: Swell from 228° is 18° off optimal 210°, workable but not ideal.
    swell size:
      score: 2
      out of: 25
      explanation: Too small: 0.6m is below minimum 1.0m. Waves will be weak/mushy.
    swell period:
      score: 1
      out of: 25
      explanation: Short period: 5s is below minimum 8s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 19 km/h from 299° (WNW). Destroying wave quality. Offshore range: 350°-60°.
  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: 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 Porth Neigwl. Either swell direction (228°), size (0.6m), or wind (19 km/h from 299°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.6
    height ft: 2.0
    direction degrees: 228
    direction cardinal: SW
    period s: 5
    explanation: 0.6m (2.0ft) swell from 228° (SW) at 5s period
  wind:
    speed kmh: 19
    speed mph: 11.8
    direction degrees: 299
    direction cardinal: WNW
    explanation: 19 km/h (12 mph) from 299° (WNW)

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: 12
      out of: 25
      explanation: Moderate alignment: Swell from 231° is 21° off optimal 210°, workable but not ideal.
    swell size:
      score: 1
      out of: 25
      explanation: Too small: 0.4m is below minimum 1.0m. Waves will be weak/mushy.
    swell period:
      score: 4
      out of: 25
      explanation: Short period: 7s is below minimum 8s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 4
      out of: 25
      explanation: Onshore/cross-shore: 13 km/h from 178° (S). Destroying wave quality. Offshore range: 350°-60°.
  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 Porth Neigwl. Either swell direction (231°), size (0.4m), or wind (13 km/h from 178°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.4
    height ft: 1.3
    direction degrees: 231
    direction cardinal: SW
    period s: 7
    explanation: 0.4m (1.3ft) swell from 231° (SW) at 7s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 178
    direction cardinal: S
    explanation: 13 km/h (8 mph) from 178° (S)

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: 9
      out of: 25
      explanation: Poor alignment: Swell from 240° is 30° off optimal 210°, barely within workable range 190°-250°.
    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: 2
      out of: 25
      explanation: Short period: 6s is below minimum 8s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 27 km/h from 195° (SSW). Destroying wave quality. Offshore range: 350°-60°.
  adjustments:
    wind history:
      adjustment: -4
      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 Porth Neigwl. Either swell direction (240°), size (0.5m), or wind (27 km/h from 195°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.5
    height ft: 1.6
    direction degrees: 240
    direction cardinal: WSW
    period s: 6
    explanation: 0.5m (1.6ft) swell from 240° (WSW) at 6s period
  wind:
    speed kmh: 27
    speed mph: 16.8
    direction degrees: 195
    direction cardinal: SSW
    explanation: 27 km/h (17 mph) from 195° (SSW)
  windswell:
    height m: 0.8
    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: 12
      out of: 25
      explanation: Moderate alignment: Swell from 231° is 21° off optimal 210°, workable but not ideal.
    swell size:
      score: 3
      out of: 25
      explanation: Too small: 0.8m is below minimum 1.0m. Waves will be weak/mushy.
    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 235° (SW). Destroying wave quality. Offshore range: 350°-60°.
  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: -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 Porth Neigwl. Either swell direction (231°), size (0.8m), or wind (26 km/h from 235°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.8
    height ft: 2.6
    direction degrees: 231
    direction cardinal: SW
    period s: 9
    explanation: 0.8m (2.6ft) swell from 231° (SW) at 9s period
  wind:
    speed kmh: 26
    speed mph: 16.2
    direction degrees: 235
    direction cardinal: SW
    explanation: 26 km/h (16 mph) from 235° (SW)
  windswell:
    height m: 0.9
    period s: 4
    explanation: Local wind-generated waves (choppy, short-period)

Strike Mission
type: Organization