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Brittany wave buoy daily means for Aug 2013

Daily means from the Brittany wave buoy for Aug 2013, 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 5.2 ft (10th–90th percentile 3.3–8.1 ft), while mean reported wave period; measurement type unavailable was 6 seconds (10th–90th percentile 5–7 seconds). Typical wind was 12.8 mph (10th–90th percentile 5.8–20.8 mph) and mean water temperature was 18.7°C (10th–90th percentile 18–19.5°C). All 3,715 checked values passed quality control. Across 3 comparable years, mean wave height was below the same-month mean of 6.4 ft and mean wave period was below the same-month mean of 6.3 seconds.

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

Typical Wave Height

5.2ft
Mean: 5.5 ft
P10–P90: 3.3 — 8.1 ft
Recorded extremes

2.3 — 11.8 ft

Mean Wave Period

6secs
P10–P90: 5 — 7secs
Recorded extremes

4 — 8secs

Mean Water Temperature

18.7°C
P10–P90: 18 — 19.5°C
Recorded extremes

17.5 — 20.1°C

Typical Wind

WNW, 12.8mph
Mean: 12.7 mph
P10–P90: 5.8 — 20.8 mph
Recorded extremes

2.2 — 28.9 mph

Circular concentration: 35%

Compared With Previous Augusts

Historical baseline from 2,120 observations across 3 years.

Wave Height
5.5ft
0.9ft below mean
Historical mean 6.4ft
Wave Period
6s
0.3s below mean
Historical mean 6.3s
Water Temperature
18.7°C
0.9°C above mean
Historical mean 17.8°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 Aug 2013Last observation shown
Metric
Mean wave height (ft)666875454655433568765549QC rejected854446
Mean observed period(s)5Reported5Reported6Reported6Reported6Reported6Reported6Reported6Reported6Reported7Reported6Reported7Reported6Reported6Reported5Reported6Reported6Reported7Reported7Reported8Reported6Reported6Reported5Reported7Reported7Reported6Reported5Reported5Reported7Reported7Reported6Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionSconcentration 94%SWconcentration 96%SWconcentration 93%SSWconcentration 96%WNWconcentration 81%WSWconcentration 65%NEconcentration 40%WSWconcentration 91%NWconcentration 91%SWconcentration 46%NNWconcentration 84%Nconcentration 99%NNEconcentration 39%SWconcentration 87%SWconcentration 96%WNWconcentration 68%SWconcentration 98%Wconcentration 99%NNWconcentration 77%Econcentration 98%ENEconcentration 94%NNEconcentration 81%Wconcentration 70%WNWconcentration 88%NNWconcentration 92%Nconcentration 100%Nconcentration 99%Nconcentration 99%NWconcentration 81%Wconcentration 93%Nconcentration 89%
Mean wind speed (mph)19171721178914910119551111181610913101517211814117816
Mean water temperature(°C)18.218.518.618.518.418.518.418.518.718.919.019.119.419.619.619.719.519.319.018.818.918.818.818.318.418.318.217.718.018.117.8

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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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