Surf Forecast for Knokke-Heist
type: Dataset
description: 10-day surf forecast with Strike Scores for Knokke-Heist, Knokke-Heist, West Flanders, Belgium
about: Knokke-Heist
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: 51.35
    longitude: 3.2833
  description: Knokke-Heist is Belgium's surf epicenter—a beach resort town that becomes the unlikely gathering point for the country's small but dedicated surf community when North Sea storms deliver rideable waves. The coastline barely faces the right direction and the water is freezing, but Belgian surfers make it work through sheer determination. When it's on, the entire Belgian surf scene shows up, creating a camaraderie born from shared suffering and limited options. This is Benelux surfing at its most committed.
summary:
  best day:
    date: 2026-08-11
    score: 13
    category: Poor
    explanation: Best day in the forecast: 2026-08-11 with a score of 13/100 (Poor)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 4/100. 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: 10
        out of: 25
        explanation: Moderate alignment: Swell from 272° is 28° off optimal 300°, 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: 1
        out of: 25
        explanation: Short period: 6s is below minimum 9s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 20 km/h from 243° (WSW). Destroying wave quality. Offshore range: 60°-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 Knokke-Heist. Either swell direction (272°), size (0.3m), or wind (20 km/h from 243°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.3
      height ft: 1.0
      direction degrees: 272
      direction cardinal: W
      period s: 6
      peak period s: 6
      explanation: 0.3m (1.0ft) swell from 272° (W) at 6s period
    wind:
      speed kmh: 20
      speed mph: 12.4
      direction degrees: 243
      direction cardinal: WSW
      explanation: 20 km/h (12 mph) from 243° (WSW)
    windswell:
      height m: 0.7
      period s: 3
      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: 22
        out of: 25
        explanation: Good alignment: Swell from 304° is 4° off optimal 300°, still within prime range.
      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: 0
        out of: 25
        explanation: Short period: 5s is below minimum 9s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 17 km/h from 294° (WNW). Destroying wave quality. Offshore range: 60°-140°.
    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 Knokke-Heist. Either swell direction (304°), size (0.6m), or wind (17 km/h from 294°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.6
      height ft: 2.0
      direction degrees: 304
      direction cardinal: NW
      period s: 5
      peak period s: 4.9
      explanation: 0.6m (2.0ft) swell from 304° (NW) at 4.9s period
    wind:
      speed kmh: 17
      speed mph: 10.6
      direction degrees: 294
      direction cardinal: WNW
      explanation: 17 km/h (11 mph) from 294° (WNW)
    windswell:
      height m: 0.3
      period s: 2
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-07
  day index: 2
  strike score:
    final score: 9
    category: Poor
    category emoji: 💤
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 6
        out of: 25
        explanation: Poor alignment: Swell from 341° is 41° off optimal 300°, barely within workable range 280°-340°.
      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: 8s is below minimum 9s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 11
        out of: 25
        explanation: Onshore/cross-shore: 9 km/h from 316° (NW). Destroying wave quality. Offshore range: 60°-140°.
    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 Knokke-Heist. Either swell direction (341°), size (0.7m), or wind (9 km/h from 316°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.7
      height ft: 2.3
      direction degrees: 341
      direction cardinal: NNW
      period s: 8
      peak period s: 7.6
      explanation: 0.7m (2.3ft) swell from 341° (NNW) at 7.6s period
    wind:
      speed kmh: 9
      speed mph: 5.6
      direction degrees: 316
      direction cardinal: NW
      explanation: 9 km/h (6 mph) from 316° (NW)
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 9
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 1
        out of: 25
        explanation: Poor alignment: Swell from 357° is 57° off optimal 300°, barely within workable range 280°-340°.
    summary: Poor conditions at Knokke-Heist. Either swell direction (357°), size (0.5m), or wind (9 km/h from 123°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T04:22:30.946Z
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)

score: 2
out of: 25
explanation: Too small: 0.5m is below minimum 1.0m. Waves will be weak/mushy.

score: 0
out of: 25
explanation: Short period: 2s is below minimum 9s. Windswell-dominated (choppy, weak waves).

score: 24
out of: 25
explanation: Light offshore: 9 km/h from 123° (ESE). Grooming the wave face beautifully.

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: 0.5
  height ft: 1.6
  direction degrees: 357
  direction cardinal: N
  period s: 3
  peak period s: 1.8
  explanation: 0.5m (1.6ft) swell from 357° (N) at 1.8s period
wind:
  speed kmh: 9
  speed mph: 5.6
  direction degrees: 123
  direction cardinal: ESE
  explanation: 9 km/h (6 mph) from 123° (ESE)

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 332° is 32° off optimal 300°, barely within workable range 280°-340°.
    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: 1
      out of: 25
      explanation: Short period: 6s is below minimum 9s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 16 km/h from 220° (SW). Destroying wave quality. Offshore range: 60°-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 Knokke-Heist. Either swell direction (332°), size (0.3m), or wind (16 km/h from 220°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.3
    height ft: 1.0
    direction degrees: 332
    direction cardinal: NNW
    period s: 6
    explanation: 0.3m (1.0ft) swell from 332° (NNW) at 6s period
  wind:
    speed kmh: 16
    speed mph: 9.9
    direction degrees: 220
    direction cardinal: SW
    explanation: 16 km/h (10 mph) from 220° (SW)
  windswell:
    height m: 0.4
    period s: 2
    explanation: Local wind-generated waves (choppy, short-period)

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: 19
      out of: 25
      explanation: Moderate alignment: Swell from 291° is 9° off optimal 300°, workable but not ideal.
    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: 1
      out of: 25
      explanation: Short period: 5s is below minimum 9s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 18 km/h from 279° (W). Destroying wave quality. Offshore range: 60°-140°.
  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 Knokke-Heist. Either swell direction (291°), size (0.5m), or wind (18 km/h from 279°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.5
    height ft: 1.6
    direction degrees: 291
    direction cardinal: WNW
    period s: 5
    explanation: 0.5m (1.6ft) swell from 291° (WNW) at 5s period
  wind:
    speed kmh: 18
    speed mph: 11.2
    direction degrees: 279
    direction cardinal: W
    explanation: 18 km/h (11 mph) from 279° (W)

date: 2026-08-11
day index: 6
strike score:
  final score: 13
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 2
      out of: 25
      explanation: Poor alignment: Swell from 353° is 53° off optimal 300°, barely within workable range 280°-340°.
    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: 7s is below minimum 9s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 22
      out of: 25
      explanation: Light offshore: 6 km/h from 138° (SE). 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 Knokke-Heist. Either swell direction (353°), size (0.5m), or wind (6 km/h from 138°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.5
    height ft: 1.6
    direction degrees: 353
    direction cardinal: N
    period s: 7
    explanation: 0.5m (1.6ft) swell from 353° (N) at 7s period
  wind:
    speed kmh: 6
    speed mph: 3.7
    direction degrees: 138
    direction cardinal: SE
    explanation: 6 km/h (4 mph) from 138° (SE)

date: 2026-08-12
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: 4
      out of: 25
      explanation: Poor alignment: Swell from 349° is 49° off optimal 300°, barely within workable range 280°-340°.
    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: 6
      out of: 25
      explanation: Moderate period: 9s meets minimum 9s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 16 km/h from 192° (SSW). Destroying wave quality. Offshore range: 60°-140°.
  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 Knokke-Heist. Either swell direction (349°), size (0.3m), or wind (16 km/h from 192°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.3
    height ft: 1.0
    direction degrees: 349
    direction cardinal: N
    period s: 9
    explanation: 0.3m (1.0ft) swell from 349° (N) at 9s period
  wind:
    speed kmh: 16
    speed mph: 9.9
    direction degrees: 192
    direction cardinal: SSW
    explanation: 16 km/h (10 mph) from 192° (SSW)

date: 2026-08-13
day index: 8
strike score:
  final score: 12
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 19
      out of: 25
      explanation: Moderate alignment: Swell from 309° is 9° off optimal 300°, workable but not ideal.
    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: 4
      out of: 25
      explanation: Short period: 8s is below minimum 9s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 4
      out of: 25
      explanation: Onshore/cross-shore: 13 km/h from 276° (W). Destroying wave quality. Offshore range: 60°-140°.
  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 Knokke-Heist. Either swell direction (309°), size (0.5m), or wind (13 km/h from 276°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.5
    height ft: 1.6
    direction degrees: 309
    direction cardinal: NW
    period s: 8
    explanation: 0.5m (1.6ft) swell from 309° (NW) at 8s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 276
    direction cardinal: W
    explanation: 13 km/h (8 mph) from 276° (W)
  windswell:
    height m: 0.3
    period s: 2
    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: 1
      out of: 25
      explanation: Poor alignment: Swell from 357° is 57° off optimal 300°, barely within workable range 280°-340°.
    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: 1
      out of: 25
      explanation: Short period: 6s is below minimum 9s. Windswell-dominated (choppy, weak waves).
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 15 km/h from 252° (WSW). Destroying wave quality. Offshore range: 60°-140°.
  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 Knokke-Heist. Either swell direction (357°), size (0.3m), or wind (15 km/h from 252°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.3
    height ft: 1.0
    direction degrees: 357
    direction cardinal: N
    period s: 6
    explanation: 0.3m (1.0ft) swell from 357° (N) at 6s period
  wind:
    speed kmh: 15
    speed mph: 9.3
    direction degrees: 252
    direction cardinal: WSW
    explanation: 15 km/h (9 mph) from 252° (WSW)

Strike Mission
type: Organization