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Brittany wave buoy daily means for Dec 2011

Daily means from the Brittany wave buoy for Dec 2011, 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

743 wave-buoy observations covered all 31 days. Typical wave height was 13.1 ft (10th–90th percentile 8.2–24 ft), while mean reported wave period; measurement type unavailable was 8.5 seconds (10th–90th percentile 7–10 seconds). Typical wind was 21.9 mph (10th–90th percentile 12.7–31.1 mph) and mean water temperature was 13.1°C (10th–90th percentile 12.5–13.8°C). 2 of 3,715 checked values (0.1%) were excluded by quality control. Across 1 comparable year, mean wave height was below the same-month mean of 20 ft and mean wave period was below the same-month mean of 10.3 seconds.

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

Typical Wave Height

13.1ft
Mean: 14.3 ft
P10–P90: 8.2 — 24 ft
Recorded extremes

6.2 — 32.8 ft

Available for 742 of 743 hourly samples

Mean Wave Period

8.5secs
P10–P90: 7 — 10secs
Recorded extremes

6 — 12secs

Mean Water Temperature

13.1°C
P10–P90: 12.5 — 13.8°C
Recorded extremes

10.5 — 14°C

Typical Wind

W, 21.9mph
Mean: 21.5 mph
P10–P90: 12.7 — 31.1 mph
Recorded extremes

3.5 — 47.2 mph

Circular concentration: 74%

Available for 742 of 743 hourly samples

Compared With Previous Decembers

Historical baseline from 738 observations across 1 year.

Wave Height
14.3ft
5.7ft below mean
Historical mean 20ft
Wave Period
8.5s
1.8s below mean
Historical mean 10.3s
Water Temperature
13.1°C
0.7°C above mean
Historical mean 12.4°C

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 2011Last observation shown
Metric
Mean wave height (ft)1313161514141513141010222426272518108798131211111214QC rejected1211
Mean observed period(s)9Reported8Reported9Reported8Reported8Reported8Reported9Reported8Reported9Reported9Reported8Reported11Reported10Reported11Reported11Reported10Reported9Reported8Reported6Reported6Reported8Reported8Reported8Reported9Reported9Reported9Reported9Reported8Reported10Reported8Reported7Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionWNWconcentration 88%NWconcentration 86%Wconcentration 100%Wconcentration 93%WNWconcentration 98%Wconcentration 98%Wconcentration 97%WSWconcentration 98%Nconcentration 71%NNEconcentration 65%Wconcentration 90%WSWconcentration 92%Wconcentration 97%Wconcentration 98%WSWconcentration 96%WNWconcentration 95%NWconcentration 95%NWconcentration 92%Wconcentration 97%WNWconcentration 93%WNWconcentration 99%SWconcentration 94%Wconcentration 55%Wconcentration 90%SWconcentration 94%Sconcentration 99%SSWconcentration 93%WNWconcentration 88%WNWconcentration 97%Wconcentration 99%WSWconcentration 98%
Mean wind speed (mph)17202526222521231311212931343635231619161611251616141724212323
Mean water temperature(°C)13.913.913.913.813.713.613.513.513.513.413.413.313.213.113.113.012.912.812.712.712.712.712.612.612.612.612.712.512.512.512.4

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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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