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Brittany wave buoy daily means for Mar 2011

Daily means from the Brittany wave buoy for Mar 2011, 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

375 wave-buoy observations covered 17 of 31 days (55%). Typical wave height was 6.6 ft (10th–90th percentile 4.6–10.5 ft), while mean reported wave period; measurement type unavailable was 7 seconds (10th–90th percentile 6–8 seconds). Typical wind was 15 mph (10th–90th percentile 5.8–22 mph) and mean water temperature was 11.9°C (10th–90th percentile 11–12°C). 7 of 1,871 checked values (0.4%) were excluded by quality control. Across 1 comparable year, mean wave height was below the same-month mean of 9.6 ft and mean wave period was above the same-month mean of 6.8 seconds.

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

Typical Wave Height

6.6ft
Mean: 7 ft
P10–P90: 4.6 — 10.5 ft
Recorded extremes

3.6 — 16.1 ft

Available for 370 of 375 hourly samples

Mean Wave Period

7secs
P10–P90: 6 — 8secs
Recorded extremes

5 — 11secs

Available for 371 of 375 hourly samples

Mean Water Temperature

11.9°C
P10–P90: 11 — 12°C
Recorded extremes

8 — 17°C

Available for 374 of 375 hourly samples

Typical Wind

Variable, 15mph
Mean: 14.2 mph
P10–P90: 5.8 — 22 mph
Recorded extremes

2.2 — 26.4 mph

Circular concentration: 29%

Available for 374 of 375 hourly samples

Compared With Previous Marchs

Historical baseline from 717 observations across 1 year.

Wave Height
7ft
2.6ft below mean
Historical mean 9.6ft
Wave Period
7s
0.2s above mean
Historical mean 6.8s
Water Temperature
11.9°C
Not enough comparable data

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 Mar 2011Last observation shown
Metric
Mean wave height (ft)---------------881065666655777813
Mean observed period(s)---------------7Reported8Reported8Reported8Reported8Reported6Reported6Reported6Reported6Reported6Reported7Reported8Reported8Reported7Reported6Reported8Reported
Mean wave power(kW/m)-------------------------------
Mean wind direction----------Nconcentration 100%----NNWconcentration 98%Wconcentration 62%Wconcentration 37%SEconcentration 89%ESEconcentration 95%Econcentration 99%ENEconcentration 99%Econcentration 98%Econcentration 98%SEconcentration 67%ESEconcentration 95%NEconcentration 82%SSEconcentration 70%Wconcentration 96%SWconcentration 96%SWconcentration 99%
Mean wind speed (mph)----------2----1813188815191717711109152124
Mean water temperature(°C)----------14.0----11.011.011.512.012.012.012.012.012.012.012.012.012.012.012.012.0

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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