Surf Forecast for Martha Lavinia
type: Dataset
description: 10-day surf forecast with Strike Scores for Martha Lavinia, King Island, Australia
about: Martha Lavinia
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -39.7183
    longitude: 144.0731
  description: Martha Lavinia is the remote beach break on King Island that Tracks magazine rated as Australia's best. Sitting in Bass Strait between Tasmania and Victoria, the west-facing beach catches every Southern Ocean swell that rolls through, delivering powerful, hollow beach break peaks with nobody around. The island's small population means you'll likely surf alone, accompanied only by the kelp forests, Cape Barren geese, and the occasional seal. Getting here requires a flight to the tiny King Island Airport, but the reward is pristine, uncrowded waves in one of Australia's wildest settings.
summary:
  best day:
    date: 2026-08-14
    score: 59
    category: Fair
    explanation: Best day in the forecast: 2026-08-14 with a score of 59/100 (Fair)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 18/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-05
  day index: 0
  strike score:
    final score: 21
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 6
        out of: 25
        explanation: Poor alignment: Swell from 181° is 44° off optimal 225°, barely within workable range 200°-260°.
      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: 6
        out of: 25
        explanation: Moderate period: 10s meets minimum 10s but below ideal 14s. Some groundswell energy present.
      wind:
        score: 17
        out of: 25
        explanation: Onshore/cross-shore: 9 km/h from 208° (SSW). Destroying wave quality. Offshore range: 210°-280°.
    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 Martha Lavinia. Either swell direction (181°), size (0.6m), or wind (9 km/h from 208°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.6
      height ft: 2.0
      direction degrees: 181
      direction cardinal: S
      period s: 10
      explanation: 0.6m (2.0ft) swell from 181° (S) at 10s period
    wind:
      speed kmh: 9
      speed mph: 5.6
      direction degrees: 208
      direction cardinal: SSW
      explanation: 9 km/h (6 mph) from 208° (SSW)
    windswell:
      height m: 0.3
      period s: 2
      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: 25
        out of: 25
        explanation: Perfect alignment: Swell from 225° is within 5° of optimal 225°.
      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: 6
        out of: 25
        explanation: Moderate period: 10s meets minimum 10s but below ideal 14s. Some groundswell energy present.
      wind:
        score: 1
        out of: 25
        explanation: Onshore/cross-shore: 17 km/h from 293° (WNW). Destroying wave quality. Offshore range: 210°-280°.
    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 Martha Lavinia. Either swell direction (225°), size (0.5m), or wind (17 km/h from 293°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.5
      height ft: 1.6
      direction degrees: 225
      direction cardinal: SW
      period s: 10
      explanation: 0.5m (1.6ft) swell from 225° (SW) at 10s period
    wind:
      speed kmh: 17
      speed mph: 10.6
      direction degrees: 293
      direction cardinal: WNW
      explanation: 17 km/h (11 mph) from 293° (WNW)
    windswell:
      height m: 0.6
      period s: 3
      explanation: Local wind-generated waves (choppy, short-period)
forecasts:
  date: 2026-08-07
  day index: 2
  strike score:
    final score: 22
    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 188° is 37° off optimal 225°, barely within workable range 200°-260°.
      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 10s. Windswell-dominated (choppy, weak waves).
      wind:
        score: 20
        out of: 25
        explanation: Onshore/cross-shore: 7 km/h from 314° (NW). Destroying wave quality. Offshore range: 210°-280°.
    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 Martha Lavinia. Either swell direction (188°), size (0.7m), or wind (7 km/h from 314°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 0.7
      height ft: 2.3
      direction degrees: 188
      direction cardinal: S
      period s: 8
      explanation: 0.7m (2.3ft) swell from 188° (S) at 8s period
    wind:
      speed kmh: 7
      speed mph: 4.3
      direction degrees: 314
      direction cardinal: NW
      explanation: 7 km/h (4 mph) from 314° (NW)
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 23
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 19
        out of: 25
        explanation: Moderate alignment: Swell from 217° is 8° off optimal 225°, 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.
    summary: Poor conditions at Martha Lavinia. Either swell direction (217°), size (0.6m), or wind (26 km/h from 6°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-05T03:09:13.139Z
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: 16s is at or above ideal 14s. Long-period groundswell with maximum power.

score: 0
out of: 25
explanation: Onshore/cross-shore: 26 km/h from 6° (N). Destroying wave quality. Offshore range: 210°-280°.

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.

swell:
  height m: 0.6
  height ft: 2.0
  direction degrees: 217
  direction cardinal: SW
  period s: 16
  explanation: 0.6m (2.0ft) swell from 217° (SW) at 16s period
wind:
  speed kmh: 26
  speed mph: 16.2
  direction degrees: 6
  direction cardinal: N
  explanation: 26 km/h (16 mph) from 6° (N)
windswell:
  height m: 0.9
  period s: 4
  explanation: Local wind-generated waves (choppy, short-period)

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: 0
      out of: 25
      explanation: No alignment: Swell from 60° is outside workable range 200°-260°. Wrong swell direction for this spot.
    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: 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: 27 km/h from 4° (N). Destroying wave quality. Offshore range: 210°-280°.
  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: -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 Martha Lavinia. Either swell direction (60°), size (0.4m), or wind (27 km/h from 4°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.4
    height ft: 1.3
    direction degrees: 60
    direction cardinal: ENE
    period s: 15
    explanation: 0.4m (1.3ft) swell from 60° (ENE) at 15s period
  wind:
    speed kmh: 27
    speed mph: 16.8
    direction degrees: 4
    direction cardinal: N
    explanation: 27 km/h (17 mph) from 4° (N)
  windswell:
    height m: 1
    period s: 4
    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: 0
      out of: 25
      explanation: No alignment: Swell from 13° is outside workable range 200°-260°. Wrong swell direction for this spot.
    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: 6
      out of: 25
      explanation: Moderate period: 10s meets minimum 10s but below ideal 14s. Some groundswell energy present.
    wind:
      score: 15
      out of: 25
      explanation: Strong offshore: 26 km/h from 263° (W). Grooming but may make paddling difficult.
  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: -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 Martha Lavinia. Either swell direction (13°), size (0.7m), or wind (26 km/h from 263°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.7
    height ft: 2.3
    direction degrees: 13
    direction cardinal: NNE
    period s: 10
    explanation: 0.7m (2.3ft) swell from 13° (NNE) at 10s period
  wind:
    speed kmh: 26
    speed mph: 16.2
    direction degrees: 263
    direction cardinal: W
    explanation: 26 km/h (16 mph) from 263° (W)
  windswell:
    height m: 1.1
    period s: 4
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-11
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: 10
      out of: 25
      explanation: Moderate alignment: Swell from 254° is 29° off optimal 225°, 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: 14
      out of: 25
      explanation: Moderate period: 12s meets minimum 10s but below ideal 14s. Some groundswell energy present.
    wind:
      score: 0
      out of: 25
      explanation: Onshore/cross-shore: 34 km/h from 325° (NW). Destroying wave quality. Offshore range: 210°-280°.
  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: -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 Martha Lavinia. Either swell direction (254°), size (0.5m), or wind (34 km/h from 325°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.5
    height ft: 1.6
    direction degrees: 254
    direction cardinal: WSW
    period s: 12
    explanation: 0.5m (1.6ft) swell from 254° (WSW) at 12s period
  wind:
    speed kmh: 34
    speed mph: 21.1
    direction degrees: 325
    direction cardinal: NW
    explanation: 34 km/h (21 mph) from 325° (NW)
  windswell:
    height m: 1.2
    period s: 5
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-12
day index: 7
strike score:
  final score: 4
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 11
      out of: 25
      explanation: Moderate alignment: Swell from 249° is 24° off optimal 225°, 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: 23
      out of: 25
      explanation: Good period: 13s is 93% of ideal 14s. Clean, powerful groundswell.
    wind:
      score: 1
      out of: 25
      explanation: Strong offshore: 39 km/h from 278° (W). Grooming but may make paddling difficult.
  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: -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 Martha Lavinia. Either swell direction (249°), size (0.3m), or wind (39 km/h from 278°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 0.3
    height ft: 1.0
    direction degrees: 249
    direction cardinal: WSW
    period s: 13
    explanation: 0.3m (1.0ft) swell from 249° (WSW) at 13s period
  wind:
    speed kmh: 39
    speed mph: 24.2
    direction degrees: 278
    direction cardinal: W
    explanation: 39 km/h (24 mph) from 278° (W)
  windswell:
    height m: 1.5
    period s: 5
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-13
day index: 8
strike score:
  final score: 49
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 11
      out of: 25
      explanation: Moderate alignment: Swell from 201° is 24° off optimal 225°, workable but not ideal.
    swell size:
      score: 19
      out of: 25
      explanation: Marginal size: 2.1m is 0.1m from ideal 2.0m.
    swell period:
      score: 22
      out of: 25
      explanation: Good period: 18s is 129% of ideal 14s. Clean, powerful groundswell.
    wind:
      score: 8
      out of: 25
      explanation: Strong offshore: 23 km/h from 274° (W). Grooming but may make paddling difficult.
  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: Surfable but not special at Martha Lavinia. The 2.1m swell from 201° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 2.1
    height ft: 6.9
    direction degrees: 201
    direction cardinal: SSW
    period s: 18
    explanation: 2.1m (6.9ft) swell from 201° (SSW) at 18s period
  wind:
    speed kmh: 23
    speed mph: 14.3
    direction degrees: 274
    direction cardinal: W
    explanation: 23 km/h (14 mph) from 274° (W)
  windswell:
    height m: 0.7
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-14
day index: 9
strike score:
  final score: 59
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 23
      out of: 25
      explanation: Good alignment: Swell from 222° is 3° off optimal 225°, still within prime range.
    swell size:
      score: 11
      out of: 25
      explanation: Marginal size: 1.4m is 0.6m from ideal 2.0m.
    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: 18
      out of: 25
      explanation: Strong offshore: 20 km/h from 264° (W). Grooming but may make paddling difficult.
  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: Surfable but not special at Martha Lavinia. The 1.4m swell from 222° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 1.4
    height ft: 4.6
    direction degrees: 222
    direction cardinal: SW
    period s: 15
    explanation: 1.4m (4.6ft) swell from 222° (SW) at 15s period
  wind:
    speed kmh: 20
    speed mph: 12.4
    direction degrees: 264
    direction cardinal: W
    explanation: 20 km/h (12 mph) from 264° (W)
  windswell:
    height m: 0.6
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

Strike Mission
type: Organization