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Île d'Yeu Nord wave buoy observations on Wed, Oct 21, 2009

Hourly readings from the Île d'Yeu Nord wave buoy for Wed, Oct 21, 2009, 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

48 wave-buoy observations were recorded during the day. Typical wave height was 6.9 ft (10th–90th percentile 6.1–7.5 ft), while mean peak wave period was 16.3 seconds (10th–90th percentile 15.3–17.3 seconds). Typical calculated wave power was approximately 23.4 kW/m (10th–90th percentile 18.1–30 kW/m), derived from significant wave height and energy period. 1 of 96 checked values (1%) were excluded by quality control.

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

Line chart showing wave height, wave period and sea temperature for Île d'Yeu Nord. Use the detailed observations table below for the same data in text form.

About Île d'Yeu Nord wave buoy

Île d'Yeu Nord is a CANDHIS station off the northern side of Île d'Yeu, maintained through France's Cerema-coordinated sea-state observatory and departmental partners. It represents Atlantic conditions around the island and provides context for the open, sandy Vendée coast to the east.

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.
Île d'Yeu Nord wave buoy hourly observations Wed, Oct 21, 2009Last observation shown
Metric
Significant wave height (ft)556677777788888777766666676776877777787777777666
Maximum wave height (ft)68881010910101111121211111011101110998999911121114101011111310101011101111119101010
Peak period (s)171717171616171716171716161716171717161717171616171716171616161615161616151616161516161516-1516
Average period (s)10111113151413141413131212121111101112111111121110121012121012111010111011111010101091089910
Mean period Tm02 (s)677788898898888877888887777787877777777776666666
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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