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Brittany wave buoy daily means for Sep 2013

Daily means from the Brittany wave buoy for Sep 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

716 wave-buoy observations covered all 30 days. Typical wave height was 6.6 ft (10th–90th percentile 4.3–9.2 ft), while mean reported wave period; measurement type unavailable was 6.5 seconds (10th–90th percentile 5–8 seconds). Typical wind was 13.9 mph (10th–90th percentile 5.8–20.8 mph) and mean water temperature was 17.7°C (10th–90th percentile 17–18.2°C). All 3,580 checked values passed quality control. Across 3 comparable years, mean wave height was below the same-month mean of 7.8 ft and mean wave period was below the same-month mean of 7.3 seconds.

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

Typical Wave Height

6.6ft
Mean: 6.9 ft
P10–P90: 4.3 — 9.2 ft
Recorded extremes

3.6 — 17.1 ft

Mean Wave Period

6.5secs
P10–P90: 5 — 8secs
Recorded extremes

4 — 10secs

Mean Water Temperature

17.7°C
P10–P90: 17 — 18.2°C
Recorded extremes

16.8 — 19.1°C

Typical Wind

Variable, 13.9mph
Mean: 13.7 mph
P10–P90: 5.8 — 20.8 mph
Recorded extremes

2.2 — 27.7 mph

Circular concentration: 15%

Compared With Previous Septembers

Historical baseline from 2,144 observations across 3 years.

Wave Height
6.9ft
0.9ft below mean
Historical mean 7.8ft
Wave Period
6.5s
0.8s below mean
Historical mean 7.3s
Water Temperature
17.7°C
0.3°C above mean
Historical mean 17.4°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 Sep 2013Last observation shown
Metric
Mean wave height (ft)87546875765557713QC rejected117758777787QC rejected5
Mean observed period(s)7Reported6Reported5Reported7Reported7Reported6Reported6Reported5Reported6Reported6Reported5Reported5Reported5Reported7Reported7Reported8Reported8Reported7Reported6Reported7Reported7Reported8Reported7Reported7Reported7Reported7Reported8Reported7Reported7Reported5Reported
Mean wave power(kW/m)------------------------------
Mean wind directionENEconcentration 98%Econcentration 98%Econcentration 99%Variableconcentration 22%NNWconcentration 91%NWconcentration 95%NWconcentration 95%WSWconcentration 93%NWconcentration 94%Nconcentration 99%Nconcentration 99%NWconcentration 98%WSWconcentration 97%Nconcentration 90%Wconcentration 90%NWconcentration 98%Wconcentration 99%WNWconcentration 95%Wconcentration 91%Variableconcentration 21%Variableconcentration 28%ESEconcentration 98%ESEconcentration 98%Sconcentration 93%SSEconcentration 75%SEconcentration 92%ESEconcentration 92%NEconcentration 75%Variableconcentration 14%Sconcentration 94%
Mean wind speed (mph)171614715201216171714151412152221191374161661013119714
Mean water temperature(°C)17.617.717.718.218.317.917.917.817.618.118.117.817.317.417.717.417.017.016.917.017.217.317.517.617.817.718.218.218.118.2

Swipe sideways to see more days.

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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