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Brittany wave buoy daily means for Dec 2010

Daily means from the Brittany wave buoy for Dec 2010, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Monthly means for

Latest

Period Summary

Programmatically generated summary. Hog Says

738 wave-buoy observations covered all 31 days. Typical wave height was 19.7 ft (10th–90th percentile 11.8–27.9 ft), while mean reported wave period; measurement type unavailable was 10.3 seconds (10th–90th percentile 8–14 seconds). Typical wind was 19.7 mph (10th–90th percentile 12.8–27.8 mph) and mean water temperature was 12.4°C (10th–90th percentile 12–13°C). 160 of 3,627 checked values (4.4%) were excluded by quality control.

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

Typical Wave Height

19.7ft
Mean: 20 ft
P10–P90: 11.8 — 27.9 ft
Recorded extremes

5.6 — 45.6 ft

Available for 600 of 738 hourly samples

Mean Wave Period

10.3secs
P10–P90: 8 — 14secs
Recorded extremes

5 — 26secs

Available for 653 of 738 hourly samples

Mean Water Temperature

12.4°C
P10–P90: 12 — 13°C
Recorded extremes

12 — 13°C

Typical Wind

ENE, 19.7mph
Mean: 20.2 mph
P10–P90: 12.8 — 27.8 mph
Recorded extremes

2.2 — 33.4 mph

Circular concentration: 36%

Chart showing grouped wave observations for Brittany. Use the table on this page for a text version of the same measurements. To open hourly observations, use a linked day name in the table.

About Brittany wave buoy

Brittany buoy (WMO 62163) is maintained jointly by the UK Met Office and Météo-France in the Bay of Biscay. Its exposed position west of Brittany monitors Atlantic conditions approaching western France and the western entrance to the English Channel. The international feed can include wind, pressure, temperature and wave observations when available.

Metrics are rows; days run left to right.
Brittany wave buoy daily means Dec 2010Last observation shown
Metric
Mean wave height (ft)2517182229212023211821172318141420192021QC rejected2021171423272421--
Mean observed period(s)11Reported9Reported10Reported11ReportedQC rejected11Reported10Reported10Reported10Reported9Reported10Reported9Reported11Reported10Reported8Reported8Reported10Reported11Reported10Reported10Reported10Reported9Reported10Reported10Reported9Reported11Reported11Reported13Reported13Reported--
Mean wave power(kW/m)-------------------------------
Mean wind directionNNEconcentration 98%Nconcentration 94%WNWconcentration 70%SWconcentration 94%ESEconcentration 79%ENEconcentration 98%NEconcentration 94%NNEconcentration 98%ENEconcentration 97%Econcentration 99%ESEconcentration 98%ESEconcentration 99%ESEconcentration 98%Econcentration 99%NEconcentration 98%NWconcentration 80%NNWconcentration 87%Wconcentration 63%Wconcentration 95%Wconcentration 97%NNEconcentration 75%NEconcentration 98%NNEconcentration 98%NEconcentration 90%Econcentration 92%SSEconcentration 97%SSWconcentration 96%Sconcentration 94%ESEconcentration 97%Econcentration 97%Econcentration 99%
Mean wind speed (mph)21192124192321272121232121181819181522191224221817292613151917
Mean water temperature(°C)13.013.013.013.013.013.013.013.013.013.013.012.512.512.612.012.012.312.812.012.012.012.012.012.012.012.012.012.012.012.012.0

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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.

Which wave period is shown?

The table shows the best period measurement supplied for each observation. It is not necessarily the energy period used to calculate wave power.

Tp
Peak period: the period at the strongest spectral peak.
Tavg
The provider's average wave period.
Tm02
A mean period calculated from the wave spectrum.
Tz
Mean zero-crossing period.
Reported
A legacy value whose period type was not recorded.
Mixed
A daily or monthly mean containing more than one period type.

Wave power needs a genuine energy period (Te). SurfHog does not substitute Tp, Tavg, Tm02 or Tz when Te is missing.

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 UK Met Office.

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