Surf Forecast for Periscopes
type: Dataset
description: 10-day surf forecast with Strike Scores for Periscopes, East Sumbawa, Indonesia
about: Periscopes
  type: TouristAttraction
  geo: GeoCoordinates
    latitude: -8.78
    longitude: 118.37
  description: Periscopes is a long, rippable right reef break in East Sumbawa that produces tight barrels over a safe reef platform. The wave works best at high tide and provides a quality alternative to Lakey Peak, offering longer rides with good barrel and turn sections. Its exposure to dry season SE trade winds can cause afternoon blow-out, making morning sessions essential for clean conditions.
summary:
  best day:
    date: 2026-08-14
    score: 78
    category: Good
    explanation: Best day in the forecast: 2026-08-14 with a score of 78/100 (Good)
  firing days count: 0
  overall recommendation: Fair recommendation: Periscopes has 8 Good days but no Firing days. Decent for a local session.
forecasts:
  date: 2026-08-05
  day index: 0
  strike score:
    final score: 68
    category: Good
    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 217° is 12° off optimal 205°, workable but not ideal.
      swell size:
        score: 13
        out of: 25
        explanation: Marginal size: 1.4m is 0.3m from ideal 1.6m.
      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: 15
        out of: 25
        explanation: Onshore/cross-shore: 7 km/h from 181° (S). Destroying wave quality. Offshore range: 330°-30°.
    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 Periscopes. 1.4m swell from 217° with manageable wind. Solid session guaranteed.
  conditions:
    swell:
      height m: 1.4
      height ft: 4.6
      direction degrees: 217
      direction cardinal: SW
      period s: 14
      explanation: 1.4m (4.6ft) swell from 217° (SW) at 14s period
    wind:
      speed kmh: 7
      speed mph: 4.3
      direction degrees: 181
      direction cardinal: S
      explanation: 7 km/h (4 mph) from 181° (S)
    secondary swell:
      height m: 0.4
      direction degrees: 165
      direction cardinal: SSE
      period s: 8
forecasts:
  date: 2026-08-06
  day index: 1
  strike score:
    final score: 70
    category: Good
    category emoji: ✅
    confidence: 1
    confidence explanation: Very high confidence (0-1 day forecast)
    breakdown:
      swell direction:
        score: 16
        out of: 25
        explanation: Moderate alignment: Swell from 218° is 13° off optimal 205°, workable but not ideal.
      swell size:
        score: 18
        out of: 25
        explanation: Marginal size: 2.3m is 0.6m from ideal 1.6m.
      swell period:
        score: 23
        out of: 25
        explanation: Good period: 17s is 121% of ideal 14s. Clean, powerful groundswell.
      wind:
        score: 15
        out of: 25
        explanation: Onshore/cross-shore: 7 km/h from 188° (S). Destroying wave quality. Offshore range: 330°-30°.
    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 Periscopes. 2.3m swell from 218° with manageable wind. Solid session guaranteed.
  conditions:
    swell:
      height m: 2.3
      height ft: 7.5
      direction degrees: 218
      direction cardinal: SW
      period s: 17
      explanation: 2.3m (7.5ft) swell from 218° (SW) at 17s period
    wind:
      speed kmh: 7
      speed mph: 4.3
      direction degrees: 188
      direction cardinal: S
      explanation: 7 km/h (4 mph) from 188° (S)
    secondary swell:
      height m: 0.5
      direction degrees: 164
      direction cardinal: SSE
      period s: 6
forecasts:
  date: 2026-08-07
  day index: 2
  strike score:
    final score: 70
    category: Good
    category emoji: ✅
    confidence: 0.95
    confidence explanation: High confidence (2-3 day forecast)
    breakdown:
      swell direction:
        score: 17
        out of: 25
        explanation: Moderate alignment: Swell from 216° is 11° off optimal 205°, workable but not ideal.
      swell size:
        score: 15
        out of: 25
        explanation: Too big: 2.5m exceeds maximum 2.4m. 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: 15
        out of: 25
        explanation: Onshore/cross-shore: 7 km/h from 181° (S). Destroying wave quality. Offshore range: 330°-30°.
    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 Periscopes. 2.5m swell from 216° with manageable wind. Solid session guaranteed.
  conditions:
    swell:
      height m: 2.5
      height ft: 8.2
      direction degrees: 216
      direction cardinal: SW
      period s: 16
      explanation: 2.5m (8.2ft) swell from 216° (SW) at 16s period
    wind:
      speed kmh: 7
      speed mph: 4.3
      direction degrees: 181
      direction cardinal: S
      explanation: 7 km/h (4 mph) from 181° (S)
    secondary swell:
      height m: 0.6
      direction degrees: 177
      direction cardinal: S
      period s: 6
forecasts:
  date: 2026-08-08
  day index: 3
  strike score:
    final score: 56
    category: Fair
    category emoji: 😐
    confidence: 0.92
    confidence explanation: High confidence (2-3 day forecast)
    summary: Surfable but not special at Periscopes. The 2.8m swell from 216° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
provider: Strike Mission
date published: 2026-08-05T03:13:46.384Z
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: 17
  out of: 25
  explanation: Moderate alignment: Swell from 216° is 11° off optimal 205°, workable but not ideal.
swell size:
  score: 9
  out of: 25
  explanation: Too big: 2.8m exceeds maximum 2.4m. 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: 9
  out of: 25
  explanation: Onshore/cross-shore: 10 km/h from 215° (SW). Destroying wave quality. Offshore range: 330°-30°.

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: 2.8
  height ft: 9.2
  direction degrees: 216
  direction cardinal: SW
  period s: 16
  explanation: 2.8m (9.2ft) swell from 216° (SW) at 16s period
wind:
  speed kmh: 10
  speed mph: 6.2
  direction degrees: 215
  direction cardinal: SW
  explanation: 10 km/h (6 mph) from 215° (SW)
secondary swell:
  height m: 0.5
  direction degrees: 156
  direction cardinal: SSE
  period s: 4

date: 2026-08-09
day index: 4
strike score:
  final score: 66
  category: Good
  category emoji: ✅
  confidence: 0.89
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 17
      out of: 25
      explanation: Moderate alignment: Swell from 216° is 11° off optimal 205°, workable but not ideal.
    swell size:
      score: 15
      out of: 25
      explanation: Too big: 2.5m exceeds maximum 2.4m. 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: 11
      out of: 25
      explanation: Onshore/cross-shore: 9 km/h from 203° (SSW). Destroying wave quality. Offshore range: 330°-30°.
  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 Periscopes. 2.5m swell from 216° with manageable wind. Solid session guaranteed.
conditions:
  swell:
    height m: 2.5
    height ft: 8.2
    direction degrees: 216
    direction cardinal: SW
    period s: 16
    explanation: 2.5m (8.2ft) swell from 216° (SW) at 16s period
  wind:
    speed kmh: 9
    speed mph: 5.6
    direction degrees: 203
    direction cardinal: SSW
    explanation: 9 km/h (6 mph) from 203° (SSW)
  secondary swell:
    height m: 0.5
    direction degrees: 159
    direction cardinal: SSE
    period s: 4

date: 2026-08-10
day index: 5
strike score:
  final score: 66
  category: Good
  category emoji: ✅
  confidence: 0.86
  confidence explanation: Moderate confidence (4-5 day forecast)
  breakdown:
    swell direction:
      score: 18
      out of: 25
      explanation: Moderate alignment: Swell from 215° is 10° off optimal 205°, workable but not ideal.
    swell size:
      score: 19
      out of: 25
      explanation: Marginal size: 2.2m is 0.6m from ideal 1.6m.
    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: 8
      out of: 25
      explanation: Onshore/cross-shore: 11 km/h from 235° (SW). Destroying wave quality. Offshore range: 330°-30°.
  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 Periscopes. 2.2m swell from 215° with manageable wind. Solid session guaranteed.
conditions:
  swell:
    height m: 2.2
    height ft: 7.2
    direction degrees: 215
    direction cardinal: SW
    period s: 15
    explanation: 2.2m (7.2ft) swell from 215° (SW) at 15s period
  wind:
    speed kmh: 11
    speed mph: 6.8
    direction degrees: 235
    direction cardinal: SW
    explanation: 11 km/h (7 mph) from 235° (SW)
  secondary swell:
    height m: 0.7
    direction degrees: 183
    direction cardinal: S
    period s: 12

date: 2026-08-11
day index: 6
strike score:
  final score: 50
  category: Fair
  category emoji: 😐
  confidence: 0.83
  confidence explanation: Low confidence (6-7 day forecast)
  breakdown:
    swell direction:
      score: 22
      out of: 25
      explanation: Good alignment: Swell from 209° is 4° off optimal 205°, still within prime range.
    swell size:
      score: 5
      out of: 25
      explanation: Too big: 3.1m exceeds maximum 2.4m. Risk of closeouts.
    swell period:
      score: 23
      out of: 25
      explanation: Good period: 17s is 121% of ideal 14s. Clean, powerful groundswell.
    wind:
      score: 4
      out of: 25
      explanation: Onshore/cross-shore: 13 km/h from 188° (S). Destroying wave quality. Offshore range: 330°-30°.
  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 Periscopes. The 3.1m swell from 209° is workable, but conditions aren't ideal. Fine if you're local, but not worth a dedicated trip.
conditions:
  swell:
    height m: 3.1
    height ft: 10.2
    direction degrees: 209
    direction cardinal: SSW
    period s: 17
    explanation: 3.1m (10.2ft) swell from 209° (SSW) at 17s period
  wind:
    speed kmh: 13
    speed mph: 8.1
    direction degrees: 188
    direction cardinal: S
    explanation: 13 km/h (8 mph) from 188° (S)

date: 2026-08-12
day index: 7
strike score:
  final score: 71
  category: Good
  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 211° is 6° off optimal 205°, still within prime range.
    swell size:
      score: 19
      out of: 25
      explanation: Marginal size: 2.2m is 0.6m from ideal 1.6m.
    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: 9 km/h from 218° (SW). Destroying wave quality. Offshore range: 330°-30°.
  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 Periscopes. 2.2m swell from 211° with manageable wind. Solid session guaranteed.
conditions:
  swell:
    height m: 2.2
    height ft: 7.2
    direction degrees: 211
    direction cardinal: SSW
    period s: 16
    explanation: 2.2m (7.2ft) swell from 211° (SSW) at 16s period
  wind:
    speed kmh: 9
    speed mph: 5.6
    direction degrees: 218
    direction cardinal: SW
    explanation: 9 km/h (6 mph) from 218° (SW)
  secondary swell:
    height m: 0.4
    direction degrees: 164
    direction cardinal: SSE
    period s: 4

date: 2026-08-13
day index: 8
strike score:
  final score: 65
  category: Good
  category emoji: ✅
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 25
      out of: 25
      explanation: Perfect alignment: Swell from 205° is within 5° of optimal 205°.
    swell size:
      score: 10
      out of: 25
      explanation: Too big: 2.7m exceeds maximum 2.4m. 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: 9
      out of: 25
      explanation: Onshore/cross-shore: 10 km/h from 207° (SSW). Destroying wave quality. Offshore range: 330°-30°.
  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 Periscopes. 2.7m swell from 205° with manageable wind. Solid session guaranteed.
conditions:
  swell:
    height m: 2.7
    height ft: 8.9
    direction degrees: 205
    direction cardinal: SSW
    period s: 16
    explanation: 2.7m (8.9ft) swell from 205° (SSW) at 16s period
  wind:
    speed kmh: 10
    speed mph: 6.2
    direction degrees: 207
    direction cardinal: SSW
    explanation: 10 km/h (6 mph) from 207° (SSW)

date: 2026-08-14
day index: 9
strike score:
  final score: 78
  category: Good
  category emoji: ✅
  confidence: 0.8
  confidence explanation: Very low confidence (8-10 day forecast, conditions may change)
  breakdown:
    swell direction:
      score: 21
      out of: 25
      explanation: Good alignment: Swell from 210° is 5° off optimal 205°, still within prime range.
    swell size:
      score: 20
      out of: 25
      explanation: Good size: 2.1m is within 15% of ideal 1.6m.
    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: 15
      out of: 25
      explanation: Onshore/cross-shore: 7 km/h from 214° (SW). Destroying wave quality. Offshore range: 330°-30°.
  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 Periscopes. 2.1m swell from 210° with manageable wind. Solid session guaranteed.
conditions:
  swell:
    height m: 2.1
    height ft: 6.9
    direction degrees: 210
    direction cardinal: SSW
    period s: 16
    explanation: 2.1m (6.9ft) swell from 210° (SSW) at 16s period
  wind:
    speed kmh: 7
    speed mph: 4.3
    direction degrees: 214
    direction cardinal: SW
    explanation: 7 km/h (4 mph) from 214° (SW)
  secondary swell:
    height m: 0.4
    direction degrees: 150
    direction cardinal: SSE
    period s: 4

Strike Mission
type: Organization