Surf Forecast for Nipussi
type: Dataset
description: 10-day surf forecast with Strike Scores for Nipussi, Siberut, Mentawai, Indonesia
about: Nipussi
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -1.8
    longitude: 98.96
  description: Nipussi is an easy-going left reef break on Siberut Island in the Mentawai chain, set against a beautiful tropical backdrop. The wave is one of the more accessible breaks in the Mentawais, making it ideal for intermediate surfers who want to experience the islands' renowned water quality and scenery without the intensity of expert-level breaks. A great warm-up or cool-down spot during Mentawai charter trips.
summary:
  best day:
    date: 2026-08-14
    score: 61
    category: Fair
    explanation: Best day in the forecast: 2026-08-14 with a score of 61/100 (Fair)
  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: 49
    category: Fair
    category emoji: 😐
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 7
        out of: 25
        explanation: Poor alignment: Swell from 195° is 40° off optimal 235°, barely within workable range 210°-260°.
      swell size:
        score: 17
        out of: 25
        explanation: Marginal size: 1.8m is 0.4m from ideal 1.4m.
      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: 7
        out of: 25
        explanation: Onshore/cross-shore: 11 km/h from 329° (NNW). Destroying wave quality. Offshore range: 82°-142°.
    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 Nipussi. The 1.8m swell from 195° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
  conditions:
    swell:
      height m: 1.8
      height ft: 5.9
      direction degrees: 195
      direction cardinal: SSW
      period s: 15
      explanation: 1.8m (5.9ft) swell from 195° (SSW) at 15s period
    wind:
      speed kmh: 11
      speed mph: 6.8
      direction degrees: 329
      direction cardinal: NNW
      explanation: 11 km/h (7 mph) from 329° (NNW)
    secondary swell:
      height m: 1.1
      direction degrees: 231
      direction cardinal: SW
      period s: 14
forecasts:
  date: 2026-08-06
  day index: 1
  strike score:
    final score: 37
    category: Poor
    category emoji: 💤
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 7
        out of: 25
        explanation: Poor alignment: Swell from 198° is 37° off optimal 235°, barely within workable range 210°-260°.
      swell size:
        score: 3
        out of: 25
        explanation: Too big: 2.6m exceeds maximum 1.8m. Risk of closeouts.
      swell period:
        score: 23
        out of: 25
        explanation: Good period: 17s is 121% of ideal 14s. Clean, powerful groundswell.
      wind:
        score: 11
        out of: 25
        explanation: Onshore/cross-shore: 9 km/h from 323° (NW). Destroying wave quality. Offshore range: 82°-142°.
    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 Nipussi. Either swell direction (198°), size (2.6m), or wind (9 km/h from 323°) is unfavorable. Consider other spots or wait for better conditions.
  conditions:
    swell:
      height m: 2.6
      height ft: 8.5
      direction degrees: 198
      direction cardinal: SSW
      period s: 17
      explanation: 2.6m (8.5ft) swell from 198° (SSW) at 17s period
    wind:
      speed kmh: 9
      speed mph: 5.6
      direction degrees: 323
      direction cardinal: NW
      explanation: 9 km/h (6 mph) from 323° (NW)
    secondary swell:
      height m: 1
      direction degrees: 287
      direction cardinal: WNW
      period s: 6
forecasts:
  date: 2026-08-07
  day index: 2
  strike score:
    final score: 58
    category: Fair
    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 197° is 38° off optimal 235°, barely within workable range 210°-260°.
      swell size:
        score: 3
        out of: 25
        explanation: Too big: 2.6m exceeds maximum 1.8m. 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: 25
        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 Nipussi. The 2.6m swell from 197° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
  conditions:
    swell:
      height m: 2.6
      height ft: 8.5
      direction degrees: 197
      direction cardinal: SSW
      period s: 16
      explanation: 2.6m (8.5ft) swell from 197° (SSW) at 16s period
    wind:
      speed kmh: 3
      speed mph: 1.9
      direction degrees: 174
      direction cardinal: S
      explanation: 3 km/h (2 mph) from 174° (S)
    secondary swell:
      height m: 0.8
      direction degrees: 253
      direction cardinal: WSW
      period s: 10
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 51
    category: Fair
    category emoji: 😐
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    summary: Surfable but not special at Nipussi. The 2.7m swell from 191° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
provider: Strike Mission
date published: 2026-08-05T03:10:07.215Z
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: 6
  out of: 25
  explanation: Poor alignment: Swell from 191° is 44° off optimal 235°, barely within workable range 210°-260°.
swell size:
  score: 2
  out of: 25
  explanation: Too big: 2.7m exceeds maximum 1.8m. 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: 25
  out of: 25
  explanation: Light offshore: 9 km/h from 128° (SE). Grooming the wave face beautifully.

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: 2.7
  height ft: 8.9
  direction degrees: 191
  direction cardinal: S
  period s: 16
  explanation: 2.7m (8.9ft) swell from 191° (S) at 16s period
wind:
  speed kmh: 9
  speed mph: 5.6
  direction degrees: 128
  direction cardinal: SE
  explanation: 9 km/h (6 mph) from 128° (SE)
secondary swell:
  height m: 0.7
  direction degrees: 271
  direction cardinal: W
  period s: 7

date: 2026-08-09
day index: 4
strike score:
  final score: 33
  category: Poor
  category emoji: 💤
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 6
      out of: 25
      explanation: Poor alignment: Swell from 192° is 43° off optimal 235°, barely within workable range 210°-260°.
    swell size:
      score: 3
      out of: 25
      explanation: Too big: 2.6m exceeds maximum 1.8m. 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: 5
      out of: 25
      explanation: Onshore/cross-shore: 15 km/h from 151° (SSE). Destroying wave quality. Offshore range: 82°-142°.
  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 Nipussi. Either swell direction (192°), size (2.6m), or wind (15 km/h from 151°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.6
    height ft: 8.5
    direction degrees: 192
    direction cardinal: SSW
    period s: 16
    explanation: 2.6m (8.5ft) swell from 192° (SSW) at 16s period
  wind:
    speed kmh: 15
    speed mph: 9.3
    direction degrees: 151
    direction cardinal: SSE
    explanation: 15 km/h (9 mph) from 151° (SSE)
  secondary swell:
    height m: 0.8
    direction degrees: 174
    direction cardinal: S
    period s: 6
  windswell:
    height m: 0.6
    period s: 3
    explanation: Local wind-generated waves (choppy, short-period)

date: 2026-08-10
day index: 5
strike score:
  final score: 42
  category: Poor
  category emoji: 💤
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 5
      out of: 25
      explanation: Poor alignment: Swell from 188° is 47° off optimal 235°, barely within workable range 210°-260°.
    swell size:
      score: 5
      out of: 25
      explanation: Too big: 2.4m exceeds maximum 1.8m. 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: 13
      out of: 25
      explanation: Onshore/cross-shore: 10 km/h from 160° (SSE). Destroying wave quality. Offshore range: 82°-142°.
  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 Nipussi. Either swell direction (188°), size (2.4m), or wind (10 km/h from 160°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.4
    height ft: 7.9
    direction degrees: 188
    direction cardinal: S
    period s: 15
    explanation: 2.4m (7.9ft) swell from 188° (S) at 15s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 160
    direction cardinal: SSE
    explanation: 10 km/h (6 mph) from 160° (SSE)
  secondary swell:
    height m: 1.1
    direction degrees: 187
    direction cardinal: S
    period s: 18

date: 2026-08-11
day index: 6
strike score:
  final score: 43
  category: Poor
  category emoji: 💤
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 3
      out of: 25
      explanation: Poor alignment: Swell from 183° is 52° off optimal 235°, barely within workable range 210°-260°.
    swell size:
      score: 1
      out of: 25
      explanation: Too big: 3.3m exceeds maximum 1.8m. Risk of closeouts.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 17s is 121% of ideal 14s. Clean, powerful groundswell.
    wind:
      score: 24
      out of: 25
      explanation: Light offshore: 8 km/h from 136° (SE). Grooming the wave face beautifully.
  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 Nipussi. Either swell direction (183°), size (3.3m), or wind (8 km/h from 136°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 3.3
    height ft: 10.8
    direction degrees: 183
    direction cardinal: S
    period s: 17
    explanation: 3.3m (10.8ft) swell from 183° (S) at 17s period
  wind:
    speed kmh: 8
    speed mph: 5.0
    direction degrees: 136
    direction cardinal: SE
    explanation: 8 km/h (5 mph) from 136° (SE)
  secondary swell:
    height m: 0.4
    direction degrees: 276
    direction cardinal: W
    period s: 9

date: 2026-08-12
day index: 7
strike score:
  final score: 42
  category: Poor
  category emoji: 💤
  confidence: 0.8
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 2
      out of: 25
      explanation: Poor alignment: Swell from 182° is 53° off optimal 235°, barely within workable range 210°-260°.
    swell size:
      score: 1
      out of: 25
      explanation: Too big: 3.0m exceeds maximum 1.8m. 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: 22
      out of: 25
      explanation: Moderate offshore: 11 km/h from 136° (SE). 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: Poor conditions at Nipussi. Either swell direction (182°), size (3.0m), or wind (11 km/h from 136°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 3
    height ft: 9.8
    direction degrees: 182
    direction cardinal: S
    period s: 16
    explanation: 3.0m (9.8ft) swell from 182° (S) at 16s period
  wind:
    speed kmh: 11
    speed mph: 6.8
    direction degrees: 136
    direction cardinal: SE
    explanation: 11 km/h (7 mph) from 136° (SE)
  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: 39
  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 176° is outside workable range 210°-260°. Wrong swell direction for this spot.
    swell size:
      score: 5
      out of: 25
      explanation: Too big: 2.4m exceeds maximum 1.8m. 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: 20
      out of: 25
      explanation: Moderate offshore: 10 km/h from 142° (SE). 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: Poor conditions at Nipussi. Either swell direction (176°), size (2.4m), or wind (10 km/h from 142°) is unfavorable. Consider other spots or wait for better conditions.
conditions:
  swell:
    height m: 2.4
    height ft: 7.9
    direction degrees: 176
    direction cardinal: S
    period s: 14
    explanation: 2.4m (7.9ft) swell from 176° (S) at 14s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 142
    direction cardinal: SE
    explanation: 10 km/h (6 mph) from 142° (SE)
  secondary swell:
    height m: 1.1
    direction degrees: 183
    direction cardinal: S
    period s: 15

date: 2026-08-14
day index: 9
strike score:
  final score: 61
  category: Fair
  category emoji: 😐
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 2
      out of: 25
      explanation: Poor alignment: Swell from 181° is 54° off optimal 235°, barely within workable range 210°-260°.
    swell size:
      score: 11
      out of: 25
      explanation: Too big: 2.0m exceeds maximum 1.8m. 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: 21
      out of: 25
      explanation: Moderate offshore: 10 km/h from 141° (SE). Still grooming but noticeable wind.
  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: Surfable but not special at Nipussi. The 2.0m swell from 181° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 2
    height ft: 6.6
    direction degrees: 181
    direction cardinal: S
    period s: 15
    explanation: 2.0m (6.6ft) swell from 181° (S) at 15s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 141
    direction cardinal: SE
    explanation: 10 km/h (6 mph) from 141° (SE)
  secondary swell:
    height m: 1.1
    direction degrees: 171
    direction cardinal: S
    period s: 16

Strike Mission
type: Organization