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Brittany wave buoy daily means for Jul 2017

Daily means from the Brittany wave buoy for Jul 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

734 wave-buoy observations covered all 31 days. Typical wave height was 5.2 ft (10th–90th percentile 3.3–9.4 ft), while mean reported wave period; measurement type unavailable was 5.9 seconds (10th–90th percentile 5–7 seconds). Typical wind was 13.9 mph (10th–90th percentile 5.8–20.8 mph) and mean water temperature was 18°C (10th–90th percentile 17.1–18.8°C). All 3,670 checked values passed quality control. Across 7 comparable years, mean wave height was below the same-month mean of 5.8 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

5.2ft
Mean: 5.7 ft
P10–P90: 3.3 — 9.4 ft
Recorded extremes

2 — 14.8 ft

Mean Wave Period

5.9secs
P10–P90: 5 — 7secs
Recorded extremes

4 — 9secs

Mean Water Temperature

18°C
P10–P90: 17.1 — 18.8°C
Recorded extremes

15.8 — 19.7°C

Typical Wind

WNW, 13.9mph
Mean: 13.5 mph
P10–P90: 5.8 — 20.8 mph
Recorded extremes

1.1 — 30 mph

Circular concentration: 56%

Compared With Previous Julys

Historical baseline from 5,045 observations across 7 years.

Wave Height
5.7ft
0.1ft below mean
Historical mean 5.8ft
Wave Period
5.9s
0.2s below mean
Historical mean 6.1s
Water Temperature
18°C
0.7°C above mean
Historical mean 17.3°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 Jul 2017Last observation shown
Metric
Mean wave height (ft)6544533456675344556109106546812876
Mean observed period(s)6Reported6Reported6Reported5Reported5Reported5Reported6Reported7Reported7Reported6Reported5Reported6Reported6Reported5Reported6Reported6Reported6Reported6Reported5Reported7Reported6Reported7Reported5Reported5Reported5Reported5Reported6Reported8Reported7Reported6Reported6Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionWNWconcentration 97%WNWconcentration 95%Wconcentration 76%Econcentration 94%NEconcentration 95%NNEconcentration 91%Nconcentration 81%Wconcentration 74%NNWconcentration 60%WNWconcentration 93%WSWconcentration 93%WNWconcentration 96%NWconcentration 87%NNWconcentration 93%WNWconcentration 84%NNEconcentration 83%NEconcentration 98%Nconcentration 65%Wconcentration 75%Wconcentration 91%Wconcentration 89%Wconcentration 98%WNWconcentration 87%NNWconcentration 97%Wconcentration 96%Wconcentration 90%Wconcentration 99%SWconcentration 98%Wconcentration 50%Wconcentration 98%Wconcentration 94%
Mean wind speed (mph)131161115778111519139866151120192321181615161721141712
Mean water temperature(°C)16.016.116.717.217.318.018.418.618.518.317.917.918.118.418.519.018.919.118.818.017.917.917.817.917.917.917.917.917.917.818.2

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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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