Surf Forecast for Strickland Bay
type: Dataset
description: 10-day surf forecast with Strike Scores for Strickland Bay, Rottnest Island, Australia
about: Strickland Bay
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -32.021
    longitude: 115.4909
  description: Strickland Bay is Rottnest Island's premier wave—a quality left-hander that breaks along a limestone reef shelf off Western Australia's quokka-inhabited island paradise. The wave offers long walls with occasional barrel sections, working through a wide range of swell sizes. Access is via a 25-minute ferry from Fremantle, and there are no cars on the island—you bike, walk, or catch the bus. The isolation from the mainland, clear water, and lack of crowds (by Perth standards) make Strickland a special escape. Watch for sharks and quokkas.
summary:
  best day:
    date: 2026-08-14
    score: 51
    category: Fair
    explanation: Best day in the forecast: 2026-08-14 with a score of 51/100 (Fair)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 32/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-05
  day index: 0
  strike score:
    final score: 48
    category: Fair
    category emoji: 😐
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 12
        out of: 25
        explanation: Moderate alignment: Swell from 236° is 21° off optimal 215°, workable but not ideal.
      swell size:
        score: 8
        out of: 25
        explanation: Too big: 4.2m exceeds maximum 3.5m. Risk of closeouts.
      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: 13
        out of: 25
        explanation: Onshore/cross-shore: 10 km/h from 321° (NW). Destroying wave quality. Offshore range: 0°-90°.
    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: Surfable but not special at Strickland Bay. The 4.2m swell from 236° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
  conditions:
    swell:
      height m: 4.2
      height ft: 13.8
      direction degrees: 236
      direction cardinal: SW
      period s: 16
      explanation: 4.2m (13.8ft) swell from 236° (SW) at 16s period
    wind:
      speed kmh: 10
      speed mph: 6.2
      direction degrees: 321
      direction cardinal: NW
      explanation: 10 km/h (6 mph) from 321° (NW)
forecasts:
  date: 2026-08-06
  day index: 1
  strike score:
    final score: 29
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 11
        out of: 25
        explanation: Moderate alignment: Swell from 240° is 25° off optimal 215°, workable but not ideal.
      swell size:
        score: 7
        out of: 25
        explanation: Too big: 4.3m exceeds maximum 3.5m. Risk of closeouts.
      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: 20 km/h from 308° (NW). Destroying wave quality. Offshore range: 0°-90°.
    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 Strickland Bay. Either swell direction (240°), size (4.3m), or wind (20 km/h from 308°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 4.3
      height ft: 14.1
      direction degrees: 240
      direction cardinal: WSW
      period s: 16
      explanation: 4.3m (14.1ft) swell from 240° (WSW) at 16s period
    wind:
      speed kmh: 20
      speed mph: 12.4
      direction degrees: 308
      direction cardinal: NW
      explanation: 20 km/h (12 mph) from 308° (NW)
    windswell:
      height m: 0.4
      period s: 2
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-07
  day index: 2
  strike score:
    final score: 28
    category: Poor
    category emoji: 💤
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 11
        out of: 25
        explanation: Moderate alignment: Swell from 239° is 24° off optimal 215°, workable but not ideal.
      swell size:
        score: 9
        out of: 25
        explanation: Too big: 4.1m exceeds maximum 3.5m. Risk of closeouts.
      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: 0
        out of: 25
        explanation: Onshore/cross-shore: 28 km/h from 243° (WSW). Destroying wave quality. Offshore range: 0°-90°.
    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 Strickland Bay. Either swell direction (239°), size (4.1m), or wind (28 km/h from 243°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 4.1
      height ft: 13.5
      direction degrees: 239
      direction cardinal: WSW
      period s: 15
      explanation: 4.1m (13.5ft) swell from 239° (WSW) at 15s period
    wind:
      speed kmh: 28
      speed mph: 17.4
      direction degrees: 243
      direction cardinal: WSW
      explanation: 28 km/h (17 mph) from 243° (WSW)
    windswell:
      height m: 0.9
      period s: 4
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 18
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 11
        out of: 25
        explanation: Moderate alignment: Swell from 239° is 24° off optimal 215°, workable but not ideal.
      swell size:
        score: 2
        out of: 25
        explanation: Too big: 5.5m exceeds maximum 3.5m. Risk of closeouts.
    summary: Poor conditions at Strickland Bay. Either swell direction (239°), size (5.5m), or wind (51 km/h from 219°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T03:09:20.872Z
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: 25
out of: 25
explanation: Perfect period: 14s is at or above ideal 14s. Long-period groundswell with maximum power.

score: 0
out of: 25
explanation: Onshore/cross-shore: 51 km/h from 219° (SW). Destroying wave quality. Offshore range: 0°-90°.

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.

swell:
  height m: 5.5
  height ft: 18.0
  direction degrees: 239
  direction cardinal: WSW
  period s: 14
  explanation: 5.5m (18.0ft) swell from 239° (WSW) at 14s period
wind:
  speed kmh: 51
  speed mph: 31.7
  direction degrees: 219
  direction cardinal: SW
  explanation: 51 km/h (32 mph) from 219° (SW)
secondary swell:
  height m: 0.6
  direction degrees: 189
  direction cardinal: S
  period s: 9
windswell:
  height m: 3.3
  period s: 7
  explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-09
day index: 4
strike score:
  final score: 19
  category: Poor
  category emoji: 💤
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 15
      out of: 25
      explanation: Moderate alignment: Swell from 231° is 16° off optimal 215°, workable but not ideal.
    swell size:
      score: 4
      out of: 25
      explanation: Too big: 4.7m exceeds maximum 3.5m. Risk of closeouts.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 17s is 121% of ideal 14s. Clean, powerful groundswell.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 18 km/h from 331° (NNW). Destroying wave quality. Offshore range: 0°-90°.
  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 Strickland Bay. Either swell direction (231°), size (4.7m), or wind (18 km/h from 331°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 4.7
    height ft: 15.4
    direction degrees: 231
    direction cardinal: SW
    period s: 17
    explanation: 4.7m (15.4ft) swell from 231° (SW) at 17s period
  wind:
    speed kmh: 18
    speed mph: 11.2
    direction degrees: 331
    direction cardinal: NNW
    explanation: 18 km/h (11 mph) from 331° (NNW)
  secondary swell:
    height m: 0.6
    direction degrees: 270
    direction cardinal: W
    period s: 5

date: 2026-08-10
day index: 5
strike score:
  final score: 31
  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 224° is 9° off optimal 215°, workable but not ideal.
    swell size:
      score: 10
      out of: 25
      explanation: Too big: 4.0m exceeds maximum 3.5m. Risk of closeouts.
    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: 0
      out of: 25
      explanation: Onshore/cross-shore: 48 km/h from 218° (SW). Destroying wave quality. Offshore range: 0°-90°.
  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 Strickland Bay. Either swell direction (224°), size (4.0m), or wind (48 km/h from 218°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 4
    height ft: 13.1
    direction degrees: 224
    direction cardinal: SW
    period s: 14
    explanation: 4.0m (13.1ft) swell from 224° (SW) at 14s period
  wind:
    speed kmh: 48
    speed mph: 29.8
    direction degrees: 218
    direction cardinal: SW
    explanation: 48 km/h (30 mph) from 218° (SW)
  windswell:
    height m: 2.1
    period s: 6
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-11
day index: 6
strike score:
  final score: 19
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 20
      out of: 25
      explanation: Good alignment: Swell from 222° is 7° off optimal 215°, still within prime range.
    swell size:
      score: 1
      out of: 25
      explanation: Too big: 6.2m exceeds maximum 3.5m. Risk of closeouts.
    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: 0
      out of: 25
      explanation: Onshore/cross-shore: 30 km/h from 208° (SSW). Destroying wave quality. Offshore range: 0°-90°.
  adjustments:
    wind history:
      adjustment: -14
      groomed: false
      morning sickness: true
      explanation: -14 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 Strickland Bay. Either swell direction (222°), size (6.2m), or wind (30 km/h from 208°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 6.2
    height ft: 20.3
    direction degrees: 222
    direction cardinal: SW
    period s: 15
    explanation: 6.2m (20.3ft) swell from 222° (SW) at 15s period
  wind:
    speed kmh: 30
    speed mph: 18.6
    direction degrees: 208
    direction cardinal: SSW
    explanation: 30 km/h (19 mph) from 208° (SSW)
  windswell:
    height m: 1
    period s: 4
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-12
day index: 7
strike score:
  final score: 30
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 20
      out of: 25
      explanation: Good alignment: Swell from 222° is 7° off optimal 215°, still within prime range.
    swell size:
      score: 10
      out of: 25
      explanation: Too big: 4.0m exceeds maximum 3.5m. Risk of closeouts.
    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: 18 km/h from 346° (NNW). Destroying wave quality. Offshore range: 0°-90°.
  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 Strickland Bay. Either swell direction (222°), size (4.0m), or wind (18 km/h from 346°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 4
    height ft: 13.1
    direction degrees: 222
    direction cardinal: SW
    period s: 16
    explanation: 4.0m (13.1ft) swell from 222° (SW) at 16s period
  wind:
    speed kmh: 18
    speed mph: 11.2
    direction degrees: 346
    direction cardinal: NNW
    explanation: 18 km/h (11 mph) from 346° (NNW)

date: 2026-08-13
day index: 8
strike score:
  final score: 50
  category: Fair
  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 223° is 8° off optimal 215°, workable but not ideal.
    swell size:
      score: 20
      out of: 25
      explanation: Good size: 3.0m is within 15% of ideal 2.3m.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 17s is 121% of ideal 14s. Clean, powerful groundswell.
    wind:
      score: 1
      out of: 25
      explanation: Onshore/cross-shore: 25 km/h from 336° (NNW). Destroying wave quality. Offshore range: 0°-90°.
  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 Strickland Bay. The 3.0m swell from 223° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 3
    height ft: 9.8
    direction degrees: 223
    direction cardinal: SW
    period s: 17
    explanation: 3.0m (9.8ft) swell from 223° (SW) at 17s period
  wind:
    speed kmh: 25
    speed mph: 15.5
    direction degrees: 336
    direction cardinal: NNW
    explanation: 25 km/h (16 mph) from 336° (NNW)
  secondary swell:
    height m: 0.4
    direction degrees: 230
    direction cardinal: SW
    period s: 17
  windswell:
    height m: 0.5
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-14
day index: 9
strike score:
  final score: 51
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 8
      out of: 25
      explanation: Poor alignment: Swell from 248° is 33° off optimal 215°, barely within workable range 190°-250°.
    swell size:
      score: 19
      out of: 25
      explanation: Marginal size: 2.4m is 0.1m from ideal 2.3m.
    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: 11
      out of: 25
      explanation: Onshore/cross-shore: 11 km/h from 104° (ESE). Destroying wave quality. Offshore range: 0°-90°.
  adjustments:
    wind history:
      adjustment: -14
      groomed: false
      morning sickness: true
      explanation: -14 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 Strickland Bay. The 2.4m swell from 248° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 2.4
    height ft: 7.9
    direction degrees: 248
    direction cardinal: WSW
    period s: 16
    explanation: 2.4m (7.9ft) swell from 248° (WSW) at 16s period
  wind:
    speed kmh: 11
    speed mph: 6.8
    direction degrees: 104
    direction cardinal: ESE
    explanation: 11 km/h (7 mph) from 104° (ESE)

Strike Mission
type: Organization