SWELLRADAR
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Updating conditions · Calibrated break

Periscopes

Hu'u · Sumbawa, Indonesia · Reef break

Local time — · Sunrise 05:37 · Sunset 18:07

Verified data gate

Reading the ocean.

SWELLRADAR is requesting a verified marine run for Periscopes.

Marine sourceChecking
Synthetic valuesBlocked
RefreshAutomatic
Spot calibratedSpot-calibrated profile

Spot intelligence.

Periscopes is calibrated as a sheltered right that needs enough south-sector energy to wrap into the reef. East wind and mid-to-high water are rewarded; low tide is deliberately penalised because the ledge becomes shallow.

Profile source · Surfline Periscopes spot guide
NS

Profile geometry

Swell axis S · 180°

Offshore wind from N · Advanced profile

Wave

Fast, powerful right-hand reef wall

Shallow coral reef

Swell window

S–SW groundswell

0.9–3.6 m offshore ranking band

Clean wind

E offshore

Applied to wind scoring

Tide window

Mid to high tide

Qualitative timing guidance

Field guide

Read the break.

Character

01

Periscopes is defined by fast, powerful right-hand reef wall over shallow coral reef. The shape can change with swell angle, period and the active section, so the live score should always be paired with a visual check from shore.

Best setup

02

S–SW groundswell swell, e offshore and mid to high tide form the profile baseline. SWELLRADAR treats 0.9–3.6 m as a working range, not a guarantee of breaking-wave size.

Lineup read

03

This is an advanced profile: positioning, entry and exit should be assessed before committing. Pay particular attention to shallow ledgy reef at low tide, fast top-to-bottom sections, rip current. Local signs and advice always take priority.

Know before you paddle

Live conditions and local advice always override this profile.

Shallow ledgy reef at low tideFast top-to-bottom sectionsRip currentCrowded takeoff
Optional community layerRecent surfer reportsVoluntary and potentially incomplete. Not used for the forecast or Surf Score.

The break

Reef break

Advanced. Works best with S–SW groundswell swell.

Timing

E offshore

Mid to high tide. Re-check local observations and the lineup before you paddle out.

Data note

Model data unavailable

SWELLRADAR withholds numerical conditions, scores and surf windows until a quality-checked marine forecast is available.