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Brittany wave buoy daily means for Mar 2018

Daily means from the Brittany wave buoy for Mar 2018, 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

729 wave-buoy observations covered all 31 days. Typical wave height was 10.8 ft (10th–90th percentile 6.9–16.4 ft), while mean reported wave period; measurement type unavailable was 7.3 seconds (10th–90th percentile 6–9 seconds). Typical wind was 20.8 mph (10th–90th percentile 9.2–31.1 mph). 2 of 2,916 checked values (0.1%) were excluded by quality control. Across 8 comparable years, mean wave height was above the same-month mean of 10 ft and mean wave period was the same as the same-month mean of 7.3 seconds.

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

Typical Wave Height

10.8ft
Mean: 11.4 ft
P10–P90: 6.9 — 16.4 ft
Recorded extremes

4.9 — 33.5 ft

Available for 727 of 729 hourly samples

Mean Wave Period

7.3secs
P10–P90: 6 — 9secs
Recorded extremes

5 — 11secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 729 hourly samples

Typical Wind

WNW, 20.8mph
Mean: 20.6 mph
P10–P90: 9.2 — 31.1 mph
Recorded extremes

2.2 — 46.1 mph

Circular concentration: 35%

Compared With Previous Marchs

Historical baseline from 5,121 observations across 8 years.

Wave Height
11.4ft
1.4ft above mean
Historical mean 10ft
Wave Period
7.3s
In line with the historical mean
Historical mean 7.3s
Water Temperature
–
Not enough comparable data
Historical mean 11.8°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 Mar 2018Last observation shown
Metric
Mean wave height (ft)QC rejected1210117101089141615QC rejected16171511101196815QC rejected97811131411
Mean observed period(s)8Reported7Reported7Reported7Reported6Reported7Reported7Reported6Reported6Reported8Reported8Reported8Reported6Reported8Reported9Reported9Reported9Reported7Reported7Reported6Reported8Reported7Reported7Reported9Reported7Reported6Reported6Reported7Reported8Reported10Reported8Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionNEconcentration 85%NNWconcentration 58%Variableconcentration 23%WSWconcentration 89%WNWconcentration 92%NWconcentration 94%Wconcentration 94%Variableconcentration 28%Sconcentration 89%SSWconcentration 90%Variableconcentration 8%WNWconcentration 98%SSWconcentration 87%SSWconcentration 95%Wconcentration 85%WSWconcentration 86%NNEconcentration 93%Nconcentration 88%NNEconcentration 98%NEconcentration 98%NNEconcentration 52%SWconcentration 96%WSWconcentration 87%Nconcentration 97%Nconcentration 99%Wconcentration 84%Wconcentration 99%WNWconcentration 84%Wconcentration 92%Variableconcentration 9%NWconcentration 74%
Mean wind speed (mph)3220132015222112222528262029241314172519721283218162223211616
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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