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Brittany wave buoy daily means for Aug 2017

Daily means from the Brittany wave buoy for Aug 2017, 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

739 wave-buoy observations covered all 31 days. Typical wave height was 4.9 ft (10th–90th percentile 3–7.9 ft), while mean reported wave period; measurement type unavailable was 5.6 seconds (10th–90th percentile 4–7 seconds). Typical wind was 13.9 mph (10th–90th percentile 6.9–19.7 mph) and mean water temperature was 18.2°C (10th–90th percentile 17.6–19.1°C). All 3,695 checked values passed quality control. Across 7 comparable years, mean wave height was below the same-month mean of 6.2 ft and mean wave period was below the same-month mean of 6.1 seconds.

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

Typical Wave Height

4.9ft
Mean: 5.3 ft
P10–P90: 3 — 7.9 ft
Recorded extremes

2.3 — 14.1 ft

Mean Wave Period

5.6secs
P10–P90: 4 — 7secs
Recorded extremes

4 — 9secs

Mean Water Temperature

18.2°C
P10–P90: 17.6 — 19.1°C
Recorded extremes

17.4 — 19.5°C

Typical Wind

W, 13.9mph
Mean: 13.6 mph
P10–P90: 6.9 — 19.7 mph
Recorded extremes

1.1 — 32.2 mph

Circular concentration: 40%

Compared With Previous Augusts

Historical baseline from 5,058 observations across 7 years.

Wave Height
5.3ft
0.9ft below mean
Historical mean 6.2ft
Wave Period
5.6s
0.5s below mean
Historical mean 6.1s
Water Temperature
18.2°C
In line with the historical mean
Historical mean 18.2°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 2017Last observation shown
Metric
Mean wave height (ft)511117546585343236577555544433477
Mean observed period(s)6Reported6Reported7Reported7Reported5Reported6Reported7Reported5Reported6Reported5Reported4Reported5Reported5Reported4Reported5Reported5Reported6Reported6Reported6Reported5Reported6Reported6Reported6Reported6Reported5Reported5Reported5Reported4Reported5Reported7Reported7Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionSWconcentration 93%SWconcentration 95%WSWconcentration 99%WNWconcentration 85%NWconcentration 98%WNWconcentration 93%WNWconcentration 78%NWconcentration 96%Nconcentration 98%NNWconcentration 98%Wconcentration 90%NNWconcentration 66%SSEconcentration 64%SSWconcentration 69%Wconcentration 78%SSWconcentration 94%WSWconcentration 98%WNWconcentration 96%Wconcentration 86%SWconcentration 98%SEconcentration 81%WSWconcentration 40%Wconcentration 98%Variableconcentration 23%SSEconcentration 98%SEconcentration 97%NEconcentration 90%NNEconcentration 98%Nconcentration 99%NNWconcentration 92%WNWconcentration 97%
Mean wind speed (mph)142719111399182114141091191914161015121211514131315161215
Mean water temperature(°C)18.117.817.617.717.617.717.717.918.017.917.917.917.917.918.017.817.918.017.918.018.518.618.718.818.918.919.119.219.219.219.1

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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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