The Surf Window

Thunders

Mentawais, Indonesia

Reef breakExpert

One of the Mentawai Islands' most powerful and revered waves, Thunders is a ferocious right-hand reef break that lives up to its name with explosive, heavy barrels over a shallow coral reef.

Typical Conditions

The Surf Window

Swell Window

N
OptimalW (270°)
WindowSSW–NNW (210°–330°)

Wind

NE

Offshore

Tide

mid-high tide

LowMidHigh

Season

June–August

JFMAMJJASOND

The Wave

Type

Right

Bottom

Shallow coral reef

Shape

Thick, detonating right, the wave ledges up abruptly and throws a massive, pitching barrel over a very shallow reef

Length

30–80m

Skill Level

  • Who it's for: Expert
  • Why: One of the Mentawais' most dangerous waves, the shallow reef and violent barrels create extreme wipeout consequences.

Hazards

  • Extremely shallow coral reef, serious injury risk
  • Violent hold-downs in the barrel
  • Remote archipelago location
  • Limited emergency resources

Local Tips

  • Thunders fires on bigger swells, it's often skipped in favour of more forgiving breaks when swell is moderate.
  • The name is accurate, the sound of the wave detonating on the reef is audible from hundreds of metres away.

Location

Map showing the location of Thunders in Mentawais, Indonesia

-2.5167, 99.8167