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Brittany wave buoy daily means for Jul 2010

Daily means from the Brittany wave buoy for Jul 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

727 wave-buoy observations covered all 31 days. Typical wave height was 6.6 ft (10th–90th percentile 3.6–10.5 ft), while mean reported wave period; measurement type unavailable was 6.9 seconds (10th–90th percentile 6–9 seconds). Typical wind was 15 mph (10th–90th percentile 9.2–23.1 mph). 1 of 2,908 checked values (0%) were excluded by quality control.

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

Typical Wave Height

6.6ft
Mean: 6.9 ft
P10–P90: 3.6 — 10.5 ft
Recorded extremes

2.6 — 21 ft

Available for 726 of 727 hourly samples

Mean Wave Period

6.9secs
P10–P90: 6 — 9secs
Recorded extremes

4 — 11secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 727 hourly samples

Typical Wind

W, 15mph
Mean: 15.6 mph
P10–P90: 9.2 — 23.1 mph
Recorded extremes

3.4 — 37 mph

Circular concentration: 66%

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 2010Last observation shown
Metric
Mean wave height (ft)781197661087677141311656779644544533
Mean observed period(s)6Reported8Reported10Reported8Reported8Reported8Reported7Reported10Reported8Reported6Reported6Reported6Reported6Reported8Reported7Reported7Reported6Reported6Reported7Reported8Reported6Reported7Reported6Reported5Reported6Reported7Reported7Reported7Reported6Reported6Reported5Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionSWconcentration 73%WNWconcentration 94%WNWconcentration 90%WSWconcentration 91%NNWconcentration 95%WSWconcentration 34%WSWconcentration 97%WSWconcentration 85%SWconcentration 97%SSWconcentration 91%Wconcentration 43%WSWconcentration 84%WSWconcentration 90%Wconcentration 96%WSWconcentration 85%Wconcentration 97%WSWconcentration 91%SSWconcentration 99%SSWconcentration 97%Wconcentration 76%WNWconcentration 94%NWconcentration 97%NWconcentration 90%WSWconcentration 84%NNWconcentration 93%Nconcentration 99%NNWconcentration 85%NWconcentration 98%NWconcentration 92%WNWconcentration 89%NWconcentration 89%
Mean wind speed (mph)20141017149129151913202030292414121516212115161311812121115
Mean water temperature(°C)-------------------------------

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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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