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Royan wave buoy observations on Sun, Oct 31, 2021

Hourly readings from the Royan wave buoy for Sun, Oct 31, 2021, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Oldest observation available

Daily means for

Latest

Period Summary

Programmatically generated summary. Hog Says

50 wave-buoy observations were recorded during the day. Typical wave height was 2.2 ft (10th–90th percentile 1.6–2.5 ft), while mean peak wave period was 4.1 seconds (10th–90th percentile 3.1–4.9 seconds). Typical calculated wave power was approximately 1 kW/m (10th–90th percentile 0.5–1.3 kW/m), derived from significant wave height and energy period. All 100 checked values passed quality control.

Generated only from the observations and comparisons shown on this page.

Line chart showing wave height, wave period and sea temperature for Royan. Use the detailed observations table below for the same data in text form.

About Royan wave buoy

Royan is part of CANDHIS, France's national in-situ sea-state observatory coordinated by Cerema and its regional partners. The station lies off the mouth of the Gironde, where Atlantic swell meets a wide, shallow and strongly tidal estuary beside the resort coastline of Royan.

Its current data source reports wave height, wave period, wave direction, directional spread and sea temperature.

Metrics are rows; hours run left to right. Times use your device time zone.
Royan wave buoy hourly observations Sun, Oct 31, 2021Last observation shown
Metric
Significant wave height (ft)22222222111112222222222233322222222222222223222222
Maximum wave height (ft)43233333222233444334343455454444323222333454344344
Peak period (s)55553335633333333444344545444444565554444434353555
Average period (s)55554433333333334444445544444445555554444444444445
Mean period Tm02 (s)44444333333333333333444444444444444444444443334444
Peak wave direction--------------------------------------------------
Directional spread (°)--------------------------------------------------
Water temperature(°C)--------------------------------------------------

Swipe sideways to see more hours.

Wave metric colour key

Colours move through the scale as each number increases. They do not by themselves mean that conditions are good, safe or suitable for you.

Wave & swell height0–40+ ft
Wave & swell period0–22+ s
Wind speed0–75 mph

The displayed numbers remain the source of truth; colour is an additional visual cue.

What does buoy wave power mean?

kW/m means kilowatts of wave power per metre of wave crest. It describes the rate at which the observed sea state carries energy past the buoy.

Unlike the shore-directed forecast value, buoy wave power is the total power at the observation point. It is not projected towards a particular beach and does not predict breaking wave height.

In deep water, wave power can be calculated with:

P is approximately 0.49 times significant wave height squared times wave energy period.

P is power in kW/m, Hs is significant wave height in metres, and Te is wave energy period in seconds.

  • Provider-reported power is used when available.
  • Otherwise, a value is calculated only when both significant height and a genuine energy period are available. The ≈ symbol marks calculated values.
  • A dash is shown instead of substituting peak, Tm02, zero-crossing or other period measurements.
  • Daily and monthly figures use the mean of hourly-normalized observation power values; they are not calculated from mean height and period.

Wave direction, spectrum, water depth and local bathymetry still matter. Wave power is best read alongside height, period and direction rather than as a standalone surf-quality score.

The observation data displayed on this page is from the Cerema CANDHIS coastal wave observatory.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

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