Surf Forecast for Lagundri Bay
type: Dataset
description: 10-day surf forecast with Strike Scores for Lagundri Bay, Nias, Indonesia
about: Lagundri Bay
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: 0.497
    longitude: 97.815
  description: Lagundri Bay (The Point, Nias) is one of the world's most celebrated right-hand barrels—a mechanical reef point that produces tube rides of up to 9 seconds when solid SW swells wrap into the bay. The 2004 earthquake actually improved the wave by lifting the reef, making it even hollower. The takeoff is vertical, the tube is cylindrical, and the rides are long. The setting on Nias Island is remote and culturally rich. Getting there requires effort, but the potential for perfect barrels makes it worth every mile.
summary:
  best day:
    date: 2026-08-06
    score: 65
    category: Good
    explanation: Best day in the forecast: 2026-08-06 with a score of 65/100 (Good)
  firing days count: 0
  overall recommendation: Poor conditions overall: Average score 49/100. Look for spots with better forecasts.
forecasts:
  date: 2026-08-05
  day index: 0
  strike score:
    final score: 54
    category: Fair
    category emoji: 😐
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 17
        out of: 25
        explanation: Moderate alignment: Swell from 236° is 11° off optimal 225°, workable but not ideal.
      swell size:
        score: 11
        out of: 25
        explanation: Marginal size: 1.6m is 1.1m from ideal 2.8m.
      swell period:
        score: 7
        out of: 25
        explanation: Moderate period: 13s meets minimum 12s but below ideal 18s. Some groundswell energy present.
      wind:
        score: 25
        out of: 25
        explanation: Moderate offshore: 10 km/h from 306° (NW). Still grooming but noticeable wind.
    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 Lagundri Bay. The 1.6m 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: 1.6
      height ft: 5.2
      direction degrees: 236
      direction cardinal: SW
      period s: 13
      explanation: 1.6m (5.2ft) swell from 236° (SW) at 13s period
    wind:
      speed kmh: 10
      speed mph: 6.2
      direction degrees: 306
      direction cardinal: NW
      explanation: 10 km/h (6 mph) from 306° (NW)
    secondary swell:
      height m: 1.2
      direction degrees: 218
      direction cardinal: SW
      period s: 13
    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: 65
    category: Good
    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 202° is 23° off optimal 225°, workable but not ideal.
      swell size:
        score: 14
        out of: 25
        explanation: Marginal size: 2.2m is 0.5m from ideal 2.8m.
      swell period:
        score: 23
        out of: 25
        explanation: Good period: 17s is 94% of ideal 18s. Clean, powerful groundswell.
      wind:
        score: 24
        out of: 25
        explanation: Light offshore: 6 km/h from 329° (NNW). Grooming the wave face beautifully.
    adjustments:
      wind history:
        adjustment: 6
        groomed: true
        morning sickness: false
        explanation: +6 points: Multiple days of offshore wind have groomed the ocean surface, creating ultra-clean conditions.
      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 Lagundri Bay. 2.2m swell from 202° with manageable wind. Solid session guaranteed.
  conditions:
    swell:
      height m: 2.2
      height ft: 7.2
      direction degrees: 202
      direction cardinal: SSW
      period s: 17
      explanation: 2.2m (7.2ft) swell from 202° (SSW) at 17s period
    wind:
      speed kmh: 6
      speed mph: 3.7
      direction degrees: 329
      direction cardinal: NNW
      explanation: 6 km/h (4 mph) from 329° (NNW)
    secondary swell:
      height m: 1.1
      direction degrees: 262
      direction cardinal: W
      period s: 7
forecasts:
  date: 2026-08-07
  day index: 2
  strike score:
    final score: 63
    category: Fair
    category emoji: 😐
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 12
        out of: 25
        explanation: Moderate alignment: Swell from 202° is 23° off optimal 225°, workable but not ideal.
      swell size:
        score: 14
        out of: 25
        explanation: Marginal size: 2.2m is 0.5m from ideal 2.8m.
      swell period:
        score: 21
        out of: 25
        explanation: Good period: 16s is 89% of ideal 18s. Clean, powerful groundswell.
      wind:
        score: 20
        out of: 25
        explanation: Onshore/cross-shore: 4 km/h from 170° (S). Destroying wave quality. Offshore range: 270°-340°.
    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 Lagundri Bay. The 2.2m swell from 202° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
  conditions:
    swell:
      height m: 2.2
      height ft: 7.2
      direction degrees: 202
      direction cardinal: SSW
      period s: 16
      explanation: 2.2m (7.2ft) swell from 202° (SSW) at 16s period
    wind:
      speed kmh: 4
      speed mph: 2.5
      direction degrees: 170
      direction cardinal: S
      explanation: 4 km/h (2 mph) from 170° (S)
    secondary swell:
      height m: 0.8
      direction degrees: 260
      direction cardinal: W
      period s: 8
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 40
    category: Poor
    category emoji: 💤
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    summary: Poor conditions at Lagundri Bay. Either swell direction (193°), size (2.3m), or wind (6 km/h from 110°) is unfavorable. Consider other spots or wait for better conditions.
provider: Strike Mission
date published: 2026-08-04T23:07:22.193Z
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: 9
  out of: 25
  explanation: Poor alignment: Swell from 193° is 32° off optimal 225°, barely within workable range 200°-270°.
swell size:
  score: 14
  out of: 25
  explanation: Marginal size: 2.3m is 0.5m from ideal 2.8m.
swell period:
  score: 21
  out of: 25
  explanation: Good period: 16s is 89% of ideal 18s. Clean, powerful groundswell.
wind:
  score: 16
  out of: 25
  explanation: Onshore/cross-shore: 6 km/h from 110° (ESE). Destroying wave quality. Offshore range: 270°-340°.

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: 2.3
  height ft: 7.5
  direction degrees: 193
  direction cardinal: SSW
  period s: 16
  explanation: 2.3m (7.5ft) swell from 193° (SSW) at 16s period
wind:
  speed kmh: 6
  speed mph: 3.7
  direction degrees: 110
  direction cardinal: ESE
  explanation: 6 km/h (4 mph) from 110° (ESE)
secondary swell:
  height m: 0.8
  direction degrees: 263
  direction cardinal: W
  period s: 7

date: 2026-08-09
day index: 4
strike score:
  final score: 36
  category: Poor
  category emoji: 💤
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 8
      out of: 25
      explanation: Poor alignment: Swell from 192° is 33° off optimal 225°, barely within workable range 200°-270°.
    swell size:
      score: 14
      out of: 25
      explanation: Marginal size: 2.2m is 0.5m from ideal 2.8m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 15s meets minimum 12s but below ideal 18s. Some groundswell energy present.
    wind:
      score: 13
      out of: 25
      explanation: Onshore/cross-shore: 8 km/h from 147° (SSE). Destroying wave quality. Offshore range: 270°-340°.
  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 Lagundri Bay. Either swell direction (192°), size (2.2m), or wind (8 km/h from 147°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.2
    height ft: 7.2
    direction degrees: 192
    direction cardinal: SSW
    period s: 15
    explanation: 2.2m (7.2ft) swell from 192° (SSW) at 15s period
  wind:
    speed kmh: 8
    speed mph: 5.0
    direction degrees: 147
    direction cardinal: SSE
    explanation: 8 km/h (5 mph) from 147° (SSE)
  secondary swell:
    height m: 0.7
    direction degrees: 276
    direction cardinal: W
    period s: 8

date: 2026-08-10
day index: 5
strike score:
  final score: 47
  category: Fair
  category emoji: 😐
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 8
      out of: 25
      explanation: Poor alignment: Swell from 190° is 35° off optimal 225°, barely within workable range 200°-270°.
    swell size:
      score: 13
      out of: 25
      explanation: Marginal size: 2.1m is 0.6m from ideal 2.8m.
    swell period:
      score: 14
      out of: 25
      explanation: Moderate period: 15s meets minimum 12s but below ideal 18s. Some groundswell energy present.
    wind:
      score: 20
      out of: 25
      explanation: Glassy: Wind speed 3 km/h (light/variable). Perfect mirror-like surface.
  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 Lagundri Bay. The 2.1m swell from 190° 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: 190
    direction cardinal: S
    period s: 15
    explanation: 2.1m (6.9ft) swell from 190° (S) at 15s period
  wind:
    speed kmh: 3
    speed mph: 1.9
    direction degrees: 173
    direction cardinal: S
    explanation: 3 km/h (2 mph) from 173° (S)
  secondary swell:
    height m: 0.6
    direction degrees: 189
    direction cardinal: S
    period s: 19

date: 2026-08-11
day index: 6
strike score:
  final score: 47
  category: Fair
  category emoji: 😐
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 7
      out of: 25
      explanation: Poor alignment: Swell from 186° is 39° off optimal 225°, barely within workable range 200°-270°.
    swell size:
      score: 15
      out of: 25
      explanation: Marginal size: 2.5m is 0.3m from ideal 2.8m.
    swell period:
      score: 25
      out of: 25
      explanation: Perfect period: 18s is at or above ideal 18s. Long-period groundswell with maximum power.
    wind:
      score: 9
      out of: 25
      explanation: Onshore/cross-shore: 10 km/h from 161° (SSE). Destroying wave quality. Offshore range: 270°-340°.
  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 Lagundri Bay. The 2.5m swell from 186° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 2.5
    height ft: 8.2
    direction degrees: 186
    direction cardinal: S
    period s: 18
    explanation: 2.5m (8.2ft) swell from 186° (S) at 18s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 161
    direction cardinal: SSE
    explanation: 10 km/h (6 mph) from 161° (SSE)
  secondary swell:
    height m: 0.5
    direction degrees: 269
    direction cardinal: W
    period s: 11

date: 2026-08-12
day index: 7
strike score:
  final score: 57
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 7
      out of: 25
      explanation: Poor alignment: Swell from 185° is 40° off optimal 225°, barely within workable range 200°-270°.
    swell size:
      score: 14
      out of: 25
      explanation: Marginal size: 2.2m is 0.5m from ideal 2.8m.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 17s is 94% of ideal 18s. Clean, powerful groundswell.
    wind:
      score: 20
      out of: 25
      explanation: Onshore/cross-shore: 5 km/h from 195° (SSW). Destroying wave quality. Offshore range: 270°-340°.
  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 Lagundri Bay. The 2.2m swell from 185° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 2.2
    height ft: 7.2
    direction degrees: 185
    direction cardinal: S
    period s: 17
    explanation: 2.2m (7.2ft) swell from 185° (S) at 17s period
  wind:
    speed kmh: 5
    speed mph: 3.1
    direction degrees: 195
    direction cardinal: SSW
    explanation: 5 km/h (3 mph) from 195° (SSW)
  secondary swell:
    height m: 0.4
    direction degrees: 250
    direction cardinal: WSW
    period s: 11

date: 2026-08-13
day index: 8
strike score:
  final score: 38
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 6
      out of: 25
      explanation: Poor alignment: Swell from 183° is 42° off optimal 225°, barely within workable range 200°-270°.
    swell size:
      score: 13
      out of: 25
      explanation: Marginal size: 2.1m is 0.6m from ideal 2.8m.
    swell period:
      score: 10
      out of: 25
      explanation: Moderate period: 14s meets minimum 12s but below ideal 18s. Some groundswell energy present.
    wind:
      score: 16
      out of: 25
      explanation: Onshore/cross-shore: 6 km/h from 120° (ESE). Destroying wave quality. Offshore range: 270°-340°.
  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 Lagundri Bay. Either swell direction (183°), size (2.1m), or wind (6 km/h from 120°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.1
    height ft: 6.9
    direction degrees: 183
    direction cardinal: S
    period s: 14
    explanation: 2.1m (6.9ft) swell from 183° (S) at 14s period
  wind:
    speed kmh: 6
    speed mph: 3.7
    direction degrees: 120
    direction cardinal: ESE
    explanation: 6 km/h (4 mph) from 120° (ESE)
  secondary swell:
    height m: 0.7
    direction degrees: 178
    direction cardinal: S
    period s: 16

date: 2026-08-14
day index: 9
strike score:
  final score: 44
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 6
      out of: 25
      explanation: Poor alignment: Swell from 183° is 42° off optimal 225°, barely within workable range 200°-270°.
    swell size:
      score: 10
      out of: 25
      explanation: Marginal size: 1.4m is 1.4m from ideal 2.8m.
    swell period:
      score: 10
      out of: 25
      explanation: Moderate period: 14s meets minimum 12s but below ideal 18s. Some groundswell energy present.
    wind:
      score: 18
      out of: 25
      explanation: Onshore/cross-shore: 5 km/h from 130° (SE). Destroying wave quality. Offshore range: 270°-340°.
  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 Lagundri Bay. Either swell direction (183°), size (1.4m), or wind (5 km/h from 130°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 1.4
    height ft: 4.6
    direction degrees: 183
    direction cardinal: S
    period s: 14
    explanation: 1.4m (4.6ft) swell from 183° (S) at 14s period
  wind:
    speed kmh: 5
    speed mph: 3.1
    direction degrees: 130
    direction cardinal: SE
    explanation: 5 km/h (3 mph) from 130° (SE)
  secondary swell:
    height m: 0.9
    direction degrees: 172
    direction cardinal: S
    period s: 16

Strike Mission
type: Organization