Oʻahu, United States · Pacific/Honolulu

Waikiki

Long, slow, shallow. Peel speed is the whole game here, and peel speed is depth, and depth is tide.

03:00 local · 2026-10-04

67% — the read for this hour

Worth the drive67%

Swell

0.78 m

Period

10 s

Swell from

186°

Wind

4.1 m/s

Wind from

49°

Air

25°C

Worth the drive67%

Worth the drive. At Waikiki on this hour the read is 67%. What earns it: peel speed at 11.7 km/h. What costs it: direction match at 74° off the 112° peel.

24 hours worth driving for today: 00:00, 01:00, 02:00, 03:00, 04:00, 05:00, 06:00, 07:00, 08:00, 09:00, 10:00, 11:00, 12:00, 13:00, 14:00, 15:00, 16:00, 17:00, 18:00, 19:00, 20:00, 21:00, 22:00, 23:00.

Tide window for a reef: 0.6–1.4 m of water over the take-off; below 0.40 m it wants the reef just covered matters and the reef is exposed.

Waikiki · 24 hours, local timelive data

score tide (dashed, MLLW) swell height now

Dashed line is the tide above MLLW, solid line is the swell height. Column height is the engine score for that hour. Faded columns are gated. The hour you select is in the URL, so this page is shareable as-is.

Tide station

Station: Honolulu, Oʻahu
Datum: MLLW
Range: 0.58 m
Mean: 0.30 m

Signature interaction

Drag the tide and watch the reef change its mind

The cross-section is drawn from the break's own reef slope. Every change re-runs the shared engine on the server and returns a fresh seal — this control cannot work without the API.

Seabed cross-section · WaikikiFringing reef — the swell stands up on a shallow shelf

Drag the tide — what-if only, nothing stored is changed

0.12 m

The dashed arrow is the peel, at c = √(g·depth). More water over the take-off means a faster peel, which is why the same swell behaves differently at low and mid tide.

Re-solved by swellread-engine/2026.10.1

Worth the drive 67%seal 3afed9fdd5bb…

Water over take-off: exposed
Break height: 0.36 m
Peel speed: 11.7 km/h
Wave power: 3.9 kW/m

Worth the drive. At Waikiki on this hour the read is 67%. What earns it: peel speed at 11.7 km/h. What costs it: direction match at 74° off the 112° peel.

Every factor, re-weighted for this tide

Swell power3.9 kW/m · 3.9%
Peel speed11.7 km/h · 20.0%
Wind quality4.1 m/s 137° off · 17.3%
Tide window1.07 m over the take-off · 18.0%
Direction match74° off the 112° peel · 0.0%
Period cleanliness10.2 s · 8.0%

Show your working

Every factor, its weight, and the arithmetic behind it

Weights are renormalised over the factors that have real data behind them. A factor with no data is dropped and said so, never quietly scored at zero.

Swell power3.9 kW/m · 3.9%
weight 0.220
Peel speed11.7 km/h · 20.0%
weight 0.200
Wind quality4.1 m/s 137° off · 17.3%
weight 0.200
Tide window1.07 m over the take-off · 18.0%
weight 0.180
Direction match74° off the 112° peel · 0.0%
weight 0.120
Period cleanliness10.2 s · 8.0%
weight 0.080

engine seal 3afed9fdd5bbd0942da1cbc6fe3f40078cb904da740913e6d352d5b171ff661afa8f33a0f8148d3bc98b043b3c392063

Swell power
P = 1/16 · rho · g · Hs² · Tp = 0.628 · 0.78² · 10 = 3.9 kW/m, against a 22 kW/m "serious day" reference.
Peel speed
c = sqrt(g · depth) = sqrt(9.81 · 1.07 m) = 11.7 km/h over a 1.07 m take-off, with 0.36 m standing up. Full marks 8.5–19 km/h: slower is mush, faster than ~25 km/h is unridable.
Wind quality
Wind is 137° off at 4.1 m/s. Alignment = 1 − (1 + cos 137°)/2 = 0.87; speed envelope at 4.1 m/s = 1.00. Product 0.87.
Tide window
reef wants the reef just covered. Ideal band 0.6–1.4 m of water over the take-off; below 0.40 m the reef is exposed.
Direction match
Swell from 186°, this break peels cleanly from 112°. 74° of error: inside 12° is full marks, past 75° the swell wraps the headland and does not arrive.
Period cleanliness
Tp = 10.2 s. Energy organises between 6 s and 9.5 s; beyond 14 s the swell stands up steeper than a shallow reef can hold, so the score is eased off by up to 35%.

Provenance

Every number above came from one of these

liveOpen-Meteo Marine APICC BY 4.0, non-commercial attribution requiredfetched 2026-10-04 20:29 UTC168 hourly rows, swell and wind wave.
liveOpen-Meteo Forecast APICC BY 4.0, non-commercial attribution requiredfetched 2026-10-04 20:29 UTC168 hourly rows, wind and air.
liveNOAA CO-OPS tide predictionsU.S. Government public domainfetched 2026-10-04 20:29 UTC144 hourly predictions, MLLW datum, station 1611400 (Honolulu, Oʻahu).

Snapshot generated 2026-10-04T20:29:17.757Z. Break orientation, reef slope and take-off depth come from this project's catalogue and are labelled as estimates, not survey data.