Surf Forecast for Cloudy Bay
type: Dataset
description: 10-day surf forecast with Strike Scores for Cloudy Bay, Bruny Island, Australia
about: Cloudy Bay
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -43.45333
    longitude: 147.22566
  description: Cloudy Bay is Bruny Island's premier surf break—a long, powerful beach exposed to the full force of the Southern Ocean. Located on the south coast of South Bruny, the beach catches S-SW groundswells that generate punchy peaks along the 4km stretch of sand. The bay hosts the annual Bruny Island Classic competition, drawing Tasmania's best surfers. Getting here requires a ferry crossing from Kettering followed by a drive through pristine Tasmanian bush. The reward is raw, uncrowded waves in one of Australia's most beautiful coastal settings.
summary:
  best day:
    date: 2026-08-08
    score: 73
    category: Good
    explanation: Best day in the forecast: 2026-08-08 with a score of 73/100 (Good)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 46/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-05
  day index: 0
  strike score:
    final score: 26
    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 129° is outside workable range 165°-215°. Wrong swell direction for this spot.
      swell size:
        score: 16
        out of: 25
        explanation: Marginal size: 1.6m is 0.1m from ideal 1.8m.
      swell period:
        score: 4
        out of: 25
        explanation: Short period: 9s is below minimum 10s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 14
        out of: 25
        explanation: Onshore/cross-shore: 8 km/h from 224° (SW). Destroying wave quality. Offshore range: 300°-20°.
    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 Cloudy Bay. Either swell direction (129°), size (1.6m), or wind (8 km/h from 224°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1.6
      height ft: 5.2
      direction degrees: 129
      direction cardinal: SE
      period s: 9
      explanation: 1.6m (5.2ft) swell from 129° (SE) at 9s period
    wind:
      speed kmh: 8
      speed mph: 5.0
      direction degrees: 224
      direction cardinal: SW
      explanation: 8 km/h (5 mph) from 224° (SW)
    secondary swell:
      height m: 0.8
      direction degrees: 221
      direction cardinal: SW
      period s: 12
forecasts:
  date: 2026-08-06
  day index: 1
  strike score:
    final score: 32
    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 114° is outside workable range 165°-215°. Wrong swell direction for this spot.
      swell size:
        score: 15
        out of: 25
        explanation: Marginal size: 1.5m is 0.3m from ideal 1.8m.
      swell period:
        score: 6
        out of: 25
        explanation: Moderate period: 10s meets minimum 10s but below ideal 14s. Some groundswell energy present.
      wind:
        score: 20
        out of: 25
        explanation: Onshore/cross-shore: 7 km/h from 265° (W). Destroying wave quality. Offshore range: 300°-20°.
    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 Cloudy Bay. Either swell direction (114°), size (1.5m), or wind (7 km/h from 265°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 1.5
      height ft: 4.9
      direction degrees: 114
      direction cardinal: ESE
      period s: 10
      explanation: 1.5m (4.9ft) swell from 114° (ESE) at 10s period
    wind:
      speed kmh: 7
      speed mph: 4.3
      direction degrees: 265
      direction cardinal: W
      explanation: 7 km/h (4 mph) from 265° (W)
    secondary swell:
      height m: 0.7
      direction degrees: 224
      direction cardinal: SW
      period s: 11
forecasts:
  date: 2026-08-07
  day index: 2
  strike score:
    final score: 69
    category: Good
    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 228° is 28° off optimal 200°, workable but not ideal.
      swell size:
        score: 17
        out of: 25
        explanation: Marginal size: 1.7m is 0.1m from ideal 1.8m.
      swell period:
        score: 25
        out of: 25
        explanation: Perfect period: 15s is at or above ideal 14s. Long-period groundswell with maximum power.
      wind:
        score: 16
        out of: 25
        explanation: Onshore/cross-shore: 9 km/h from 260° (W). Destroying wave quality. Offshore range: 300°-20°.
    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: Good surfable conditions at Cloudy Bay. 1.7m swell from 228° with manageable wind. Solid session guaranteed.
  conditions:
    swell:
      height m: 1.7
      height ft: 5.6
      direction degrees: 228
      direction cardinal: SW
      period s: 15
      explanation: 1.7m (5.6ft) swell from 228° (SW) at 15s period
    wind:
      speed kmh: 9
      speed mph: 5.6
      direction degrees: 260
      direction cardinal: W
      explanation: 9 km/h (6 mph) from 260° (W)
    secondary swell:
      height m: 0.7
      direction degrees: 210
      direction cardinal: SSW
      period s: 4
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 73
    category: Good
    category emoji: ✅
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    summary: Good surfable conditions at Cloudy Bay. 1.7m swell from 220° with manageable wind. Solid session guaranteed.
provider: Strike Mission
date published: 2026-08-05T05:51:23.133Z
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: 13
  out of: 25
  explanation: Moderate alignment: Swell from 220° is 20° off optimal 200°, workable but not ideal.
swell size:
  score: 17
  out of: 25
  explanation: Marginal size: 1.7m is 0.1m from ideal 1.8m.
swell period:
  score: 25
  out of: 25
  explanation: Perfect period: 16s is at or above ideal 14s. Long-period groundswell with maximum power.
wind:
  score: 18
  out of: 25
  explanation: Moderate offshore: 13 km/h from 10° (N). Still grooming but noticeable wind.

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: 1.7
  height ft: 5.6
  direction degrees: 220
  direction cardinal: SW
  period s: 16
  explanation: 1.7m (5.6ft) swell from 220° (SW) at 16s period
wind:
  speed kmh: 13
  speed mph: 8.1
  direction degrees: 10
  direction cardinal: N
  explanation: 13 km/h (8 mph) from 10° (N)
secondary swell:
  height m: 0.4
  direction degrees: 105
  direction cardinal: ESE
  period s: 7

date: 2026-08-09
day index: 4
strike score:
  final score: 45
  category: Fair
  category emoji: 😐
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 11
      out of: 25
      explanation: Moderate alignment: Swell from 226° is 26° off optimal 200°, workable but not ideal.
    swell size:
      score: 12
      out of: 25
      explanation: Marginal size: 1.1m is 0.6m from ideal 1.8m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 14s is at or above ideal 14s. Long-period groundswell with maximum power.
    wind:
      score: 2
      out of: 25
      explanation: Onshore/cross-shore: 21 km/h from 22° (NNE). Destroying wave quality. Offshore range: 300°-20°.
  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: Surfable but not special at Cloudy Bay. The 1.1m swell from 226° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 1.1
    height ft: 3.6
    direction degrees: 226
    direction cardinal: SW
    period s: 14
    explanation: 1.1m (3.6ft) swell from 226° (SW) at 14s period
  wind:
    speed kmh: 21
    speed mph: 13.0
    direction degrees: 22
    direction cardinal: NNE
    explanation: 21 km/h (13 mph) from 22° (NNE)

date: 2026-08-10
day index: 5
strike score:
  final score: 39
  category: Poor
  category emoji: 💤
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 13
      out of: 25
      explanation: Moderate alignment: Swell from 219° is 19° off optimal 200°, workable but not ideal.
    swell size:
      score: 15
      out of: 25
      explanation: Marginal size: 1.5m is 0.3m from ideal 1.8m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 16s is at or above ideal 14s. Long-period groundswell with maximum power.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 24 km/h from 256° (WSW). Destroying wave quality. Offshore range: 300°-20°.
  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 Cloudy Bay. Either swell direction (219°), size (1.5m), or wind (24 km/h from 256°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.5
    height ft: 4.9
    direction degrees: 219
    direction cardinal: SW
    period s: 16
    explanation: 1.5m (4.9ft) swell from 219° (SW) at 16s period
  wind:
    speed kmh: 24
    speed mph: 14.9
    direction degrees: 256
    direction cardinal: WSW
    explanation: 24 km/h (15 mph) from 256° (WSW)
  secondary swell:
    height m: 0.5
    direction degrees: 83
    direction cardinal: E
    period s: 7
  windswell:
    height m: 0.3
    period s: 2
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-11
day index: 6
strike score:
  final score: 63
  category: Fair
  category emoji: 😐
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 11
      out of: 25
      explanation: Moderate alignment: Swell from 225° is 25° off optimal 200°, workable but not ideal.
    swell size:
      score: 16
      out of: 25
      explanation: Marginal size: 1.6m is 0.1m from ideal 1.8m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 15s is at or above ideal 14s. Long-period groundswell with maximum power.
    wind:
      score: 24
      out of: 25
      explanation: Moderate offshore: 14 km/h from 343° (NNW). Still grooming but noticeable wind.
  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: Surfable but not special at Cloudy Bay. The 1.6m swell from 225° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 1.6
    height ft: 5.2
    direction degrees: 225
    direction cardinal: SW
    period s: 15
    explanation: 1.6m (5.2ft) swell from 225° (SW) at 15s period
  wind:
    speed kmh: 14
    speed mph: 8.7
    direction degrees: 343
    direction cardinal: NNW
    explanation: 14 km/h (9 mph) from 343° (NNW)
  secondary swell:
    height m: 0.5
    direction degrees: 145
    direction cardinal: SE
    period s: 11

date: 2026-08-12
day index: 7
strike score:
  final score: 52
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 8
      out of: 25
      explanation: Poor alignment: Swell from 234° is 34° off optimal 200°, barely within workable range 165°-215°.
    swell size:
      score: 18
      out of: 25
      explanation: Marginal size: 2.8m is 1.0m from ideal 1.8m.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 13s is 93% of ideal 14s. Clean, powerful groundswell.
    wind:
      score: 13
      out of: 25
      explanation: Strong offshore: 24 km/h from 311° (NW). Grooming but may make paddling difficult.
  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: Surfable but not special at Cloudy Bay. The 2.8m swell from 234° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 2.8
    height ft: 9.2
    direction degrees: 234
    direction cardinal: SW
    period s: 13
    explanation: 2.8m (9.2ft) swell from 234° (SW) at 13s period
  wind:
    speed kmh: 24
    speed mph: 14.9
    direction degrees: 311
    direction cardinal: NW
    explanation: 24 km/h (15 mph) from 311° (NW)
  secondary swell:
    height m: 0.4
    direction degrees: 114
    direction cardinal: ESE
    period s: 7
  windswell:
    height m: 0.5
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-13
day index: 8
strike score:
  final score: 34
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 17
      out of: 25
      explanation: Moderate alignment: Swell from 211° is 11° off optimal 200°, workable but not ideal.
    swell size:
      score: 0
      out of: 25
      explanation: Too big: 6.7m exceeds maximum 3.0m. Risk of closeouts.
    swell period:
      score: 22
      out of: 25
      explanation: Good period: 18s is 129% of ideal 14s. Clean, powerful groundswell.
    wind:
      score: 5
      out of: 25
      explanation: Onshore/cross-shore: 19 km/h from 295° (WNW). Destroying wave quality. Offshore range: 300°-20°.
  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 Cloudy Bay. Either swell direction (211°), size (6.7m), or wind (19 km/h from 295°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 6.7
    height ft: 22.0
    direction degrees: 211
    direction cardinal: SSW
    period s: 18
    explanation: 6.7m (22.0ft) swell from 211° (SSW) at 18s period
  wind:
    speed kmh: 19
    speed mph: 11.8
    direction degrees: 295
    direction cardinal: WNW
    explanation: 19 km/h (12 mph) from 295° (WNW)
  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: 24
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 3
      out of: 25
      explanation: Poor alignment: Swell from 148° is 52° off optimal 200°, barely within workable range 165°-215°.
    swell size:
      score: 11
      out of: 25
      explanation: Marginal size: 1.0m is 0.8m from ideal 1.8m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 15s is at or above ideal 14s. Long-period groundswell with maximum power.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 17 km/h from 290° (WNW). Destroying wave quality. Offshore range: 300°-20°.
  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 Cloudy Bay. Either swell direction (148°), size (1.0m), or wind (17 km/h from 290°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1
    height ft: 3.3
    direction degrees: 148
    direction cardinal: SSE
    period s: 15
    explanation: 1.0m (3.3ft) swell from 148° (SSE) at 15s period
  wind:
    speed kmh: 17
    speed mph: 10.6
    direction degrees: 290
    direction cardinal: WNW
    explanation: 17 km/h (11 mph) from 290° (WNW)

Strike Mission
type: Organization