Surf Forecast for Sunabe Seawall
type: Dataset
description: 10-day surf forecast with Strike Scores for Sunabe Seawall, Chatan, Japan
about: Sunabe Seawall
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: 26.3217
    longitude: 127.7483
  description: Sunabe Seawall is the most hallowed ground for surfing in Okinawa, a series of reef breaks along a seawall near American Village. The area features multiple distinct peaks—Bowls, California, Hawaiians, Hotels—each breaking over rock reef with dedicated paddle channels. The consistent windswell from October through March combines with occasional typhoon groundswells to produce fun waves in tropical water. Shallow reef means you surf around high tide and wear booties, but the warm water and welcoming community make this a Waikiki-like experience.
summary:
  best day:
    date: 2026-08-12
    score: 25
    category: Poor
    explanation: Best day in the forecast: 2026-08-12 with a score of 25/100 (Poor)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 9/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-05
  day index: 0
  strike score:
    final score: 16
    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 94° is outside workable range 240°-320°. Wrong swell direction for this spot.
      swell size:
        score: 10
        out of: 25
        explanation: Marginal size: 1.0m is 0.6m from ideal 1.6m.
      swell period:
        score: 22
        out of: 25
        explanation: Good period: 16s is 133% of ideal 12s. Clean, powerful groundswell.
      wind:
        score: 1
        out of: 25
        explanation: Onshore/cross-shore: 16 km/h from 30° (NNE). Destroying wave quality. Offshore range: 50°-130°.
    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 Sunabe Seawall. Either swell direction (94°), size (1.0m), or wind (16 km/h from 30°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1
      height ft: 3.3
      direction degrees: 94
      direction cardinal: E
      period s: 16
      explanation: 1.0m (3.3ft) swell from 94° (E) at 16s period
    wind:
      speed kmh: 16
      speed mph: 9.9
      direction degrees: 30
      direction cardinal: NNE
      explanation: 16 km/h (10 mph) from 30° (NNE)
    windswell:
      height m: 0.4
      period s: 2
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-06
  day index: 1
  strike score:
    final score: 13
    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 103° is outside workable range 240°-320°. Wrong swell direction for this spot.
      swell size:
        score: 15
        out of: 25
        explanation: Too big: 2.6m exceeds maximum 2.5m. Risk of closeouts.
      swell period:
        score: 20
        out of: 25
        explanation: Good period: 17s is 142% of ideal 12s. Clean, powerful groundswell.
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 41 km/h from 352° (N). Destroying wave quality. Offshore range: 50°-130°.
    adjustments:
      wind history:
        adjustment: 0
        groomed: false
        morning sickness: false
        explanation: No significant wind history adjustment.
      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 Sunabe Seawall. Either swell direction (103°), size (2.6m), or wind (41 km/h from 352°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 2.6
      height ft: 8.5
      direction degrees: 103
      direction cardinal: ESE
      period s: 17
      explanation: 2.6m (8.5ft) swell from 103° (ESE) at 17s period
    wind:
      speed kmh: 41
      speed mph: 25.5
      direction degrees: 352
      direction cardinal: N
      explanation: 41 km/h (25 mph) from 352° (N)
    windswell:
      height m: 1.9
      period s: 5
      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: 0
        out of: 25
        explanation: No alignment: Swell from 16° is outside workable range 240°-320°. Wrong swell direction for this spot.
      swell size:
        score: 3
        out of: 25
        explanation: Too big: 3.5m exceeds maximum 2.5m. Risk of closeouts.
      swell period:
        score: 20
        out of: 25
        explanation: Good period: 17s is 142% of ideal 12s. Clean, powerful groundswell.
      wind:
        score: 0
        out of: 25
        explanation: Onshore/cross-shore: 47 km/h from 233° (SW). Destroying wave quality. Offshore range: 50°-130°.
    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 Sunabe Seawall. Either swell direction (16°), size (3.5m), or wind (47 km/h from 233°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 3.5
      height ft: 11.5
      direction degrees: 16
      direction cardinal: NNE
      period s: 17
      explanation: 3.5m (11.5ft) swell from 16° (NNE) at 17s period
    wind:
      speed kmh: 47
      speed mph: 29.2
      direction degrees: 233
      direction cardinal: SW
      explanation: 47 km/h (29 mph) from 233° (SW)
    secondary swell:
      height m: 1
      direction degrees: 307
      direction cardinal: NW
      period s: 9
    windswell:
      height m: 2.6
      period s: 5
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-08
  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 Sunabe Seawall. Either swell direction (186°), size (4.3m), or wind (48 km/h from 146°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T03:09:21.737Z
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: 0
  out of: 25
  explanation: No alignment: Swell from 186° is outside workable range 240°-320°. Wrong swell direction for this spot.
swell size:
  score: 1
  out of: 25
  explanation: Too big: 4.3m exceeds maximum 2.5m. Risk of closeouts.
swell period:
  score: 25
  out of: 25
  explanation: Perfect period: 13s is at or above ideal 12s. Long-period groundswell with maximum power.
wind:
  score: 0
  out of: 25
  explanation: Onshore/cross-shore: 48 km/h from 146° (SE). Destroying wave quality. Offshore range: 50°-130°.

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: 3
  explanation: +3 points: Secondary swell from a favorable direction enhances wave shape at this spot.

swell:
  height m: 4.3
  height ft: 14.1
  direction degrees: 186
  direction cardinal: S
  period s: 13
  explanation: 4.3m (14.1ft) swell from 186° (S) at 13s period
wind:
  speed kmh: 48
  speed mph: 29.8
  direction degrees: 146
  direction cardinal: SE
  explanation: 48 km/h (30 mph) from 146° (SE)
secondary swell:
  height m: 0.8
  direction degrees: 221
  direction cardinal: SW
  period s: 10
windswell:
  height m: 3
  period s: 7
  explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-09
day index: 4
strike score:
  final score: 8
  category: Poor
  category emoji: 💤
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 3
      out of: 25
      explanation: Poor alignment: Swell from 229° is 51° off optimal 280°, barely within workable range 240°-320°.
    swell size:
      score: 20
      out of: 25
      explanation: Good size: 1.8m is within 15% of ideal 1.6m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 12s is at or above ideal 12s. Long-period groundswell with maximum power.
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 33 km/h from 143° (SE). Destroying wave quality. Offshore range: 50°-130°.
  adjustments:
    wind history:
      adjustment: -21
      groomed: false
      morning sickness: true
      explanation: -21 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 Sunabe Seawall. Either swell direction (229°), size (1.8m), or wind (33 km/h from 143°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.8
    height ft: 5.9
    direction degrees: 229
    direction cardinal: SW
    period s: 12
    explanation: 1.8m (5.9ft) swell from 229° (SW) at 12s period
  wind:
    speed kmh: 33
    speed mph: 20.5
    direction degrees: 143
    direction cardinal: SE
    explanation: 33 km/h (21 mph) from 143° (SE)
  secondary swell:
    height m: 0.6
    direction degrees: 249
    direction cardinal: WSW
    period s: 9
  windswell:
    height m: 1.6
    period s: 5
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-10
day index: 5
strike score:
  final score: 3
  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 350° is outside workable range 240°-320°. Wrong swell direction for this spot.
    swell size:
      score: 20
      out of: 25
      explanation: Good size: 1.8m is within 15% of ideal 1.6m.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 15s is 125% of ideal 12s. Clean, powerful groundswell.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 27 km/h from 168° (SSE). Destroying wave quality. Offshore range: 50°-130°.
  adjustments:
    wind history:
      adjustment: -21
      groomed: false
      morning sickness: true
      explanation: -21 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 Sunabe Seawall. Either swell direction (350°), size (1.8m), or wind (27 km/h from 168°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.8
    height ft: 5.9
    direction degrees: 350
    direction cardinal: N
    period s: 15
    explanation: 1.8m (5.9ft) swell from 350° (N) at 15s period
  wind:
    speed kmh: 27
    speed mph: 16.8
    direction degrees: 168
    direction cardinal: SSE
    explanation: 27 km/h (17 mph) from 168° (SSE)
  secondary swell:
    height m: 0.8
    direction degrees: 215
    direction cardinal: SW
    period s: 9
  windswell:
    height m: 1.2
    period s: 5
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-11
day index: 6
strike score:
  final score: 9
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 1
      out of: 25
      explanation: Poor alignment: Swell from 223° is 57° off optimal 280°, barely within workable range 240°-320°.
    swell size:
      score: 19
      out of: 25
      explanation: Marginal size: 2.3m is 0.6m from ideal 1.6m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 13s is at or above ideal 12s. Long-period groundswell with maximum power.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 18 km/h from 175° (S). Destroying wave quality. Offshore range: 50°-130°.
  adjustments:
    wind history:
      adjustment: -21
      groomed: false
      morning sickness: true
      explanation: -21 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: 3
      explanation: +3 points: Secondary swell from a favorable direction enhances wave shape at this spot.
  summary: Poor conditions at Sunabe Seawall. Either swell direction (223°), size (2.3m), or wind (18 km/h from 175°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.3
    height ft: 7.5
    direction degrees: 223
    direction cardinal: SW
    period s: 13
    explanation: 2.3m (7.5ft) swell from 223° (SW) at 13s period
  wind:
    speed kmh: 18
    speed mph: 11.2
    direction degrees: 175
    direction cardinal: S
    explanation: 18 km/h (11 mph) from 175° (S)
  secondary swell:
    height m: 0.8
    direction degrees: 226
    direction cardinal: SW
    period s: 8
  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: 25
  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 189° is outside workable range 240°-320°. Wrong swell direction for this spot.
    swell size:
      score: 22
      out of: 25
      explanation: Good size: 2.1m is within 15% of ideal 1.6m.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 11s is 92% of ideal 12s. Clean, powerful groundswell.
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 14 km/h from 180° (S). Destroying wave quality. Offshore range: 50°-130°.
  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 Sunabe Seawall. Either swell direction (189°), size (2.1m), or wind (14 km/h from 180°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.1
    height ft: 6.9
    direction degrees: 189
    direction cardinal: S
    period s: 11
    explanation: 2.1m (6.9ft) swell from 189° (S) at 11s period
  wind:
    speed kmh: 14
    speed mph: 8.7
    direction degrees: 180
    direction cardinal: S
    explanation: 14 km/h (9 mph) from 180° (S)
  secondary swell:
    height m: 0.7
    direction degrees: 223
    direction cardinal: SW
    period s: 7
  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: 10
  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 189° is outside workable range 240°-320°. Wrong swell direction for this spot.
    swell size:
      score: 14
      out of: 25
      explanation: Marginal size: 1.4m is 0.3m from ideal 1.6m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 16 km/h from 167° (SSE). Destroying wave quality. Offshore range: 50°-130°.
  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: 2
      explanation: +2 points: Secondary swell from a favorable direction enhances wave shape at this spot.
  summary: Poor conditions at Sunabe Seawall. Either swell direction (189°), size (1.4m), or wind (16 km/h from 167°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.4
    height ft: 4.6
    direction degrees: 189
    direction cardinal: S
    period s: 10
    explanation: 1.4m (4.6ft) swell from 189° (S) at 10s period
  wind:
    speed kmh: 16
    speed mph: 9.9
    direction degrees: 167
    direction cardinal: SSE
    explanation: 16 km/h (10 mph) from 167° (SSE)
  secondary swell:
    height m: 0.5
    direction degrees: 185
    direction cardinal: S
    period s: 6
  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: 9
  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 187° is outside workable range 240°-320°. Wrong swell direction for this spot.
    swell size:
      score: 11
      out of: 25
      explanation: Marginal size: 1.1m is 0.5m from ideal 1.6m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 10s meets minimum 8s but below ideal 12s. Some groundswell energy present.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 15 km/h from 167° (SSE). Destroying wave quality. Offshore range: 50°-130°.
  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: 2
      explanation: +2 points: Secondary swell from a favorable direction enhances wave shape at this spot.
  summary: Poor conditions at Sunabe Seawall. Either swell direction (187°), size (1.1m), or wind (15 km/h from 167°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.1
    height ft: 3.6
    direction degrees: 187
    direction cardinal: S
    period s: 10
    explanation: 1.1m (3.6ft) swell from 187° (S) at 10s period
  wind:
    speed kmh: 15
    speed mph: 9.3
    direction degrees: 167
    direction cardinal: SSE
    explanation: 15 km/h (9 mph) from 167° (SSE)
  secondary swell:
    height m: 0.5
    direction degrees: 181
    direction cardinal: S
    period s: 6

Strike Mission
type: Organization