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Brittany wave buoy daily means for Apr 2016

Daily means from the Brittany wave buoy for Apr 2016, 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

659 wave-buoy observations covered 28 of 30 days (93%). Typical wave height was 7.9 ft (10th–90th percentile 3.3–14.1 ft), while mean reported wave period; measurement type unavailable was 7 seconds (10th–90th percentile 5–9 seconds). Typical wind was 15 mph (10th–90th percentile 5.8–25.5 mph) and mean water temperature was 11.4°C (10th–90th percentile 11.4–12.1°C). 1 of 3,295 checked values (0%) were excluded by quality control. Across 6 comparable years, mean wave height was below the same-month mean of 8.9 ft and mean wave period was below the same-month mean of 7.2 seconds.

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

Typical Wave Height

7.9ft
Mean: 8.4 ft
P10–P90: 3.3 — 14.1 ft
Recorded extremes

0.3 — 18.7 ft

Available for 658 of 659 hourly samples

Mean Wave Period

7secs
P10–P90: 5 — 9secs
Recorded extremes

4 — 15secs

Mean Water Temperature

11.4°C
P10–P90: 11.4 — 12.1°C
Recorded extremes

6.6 — 13°C

Typical Wind

Variable, 15mph
Mean: 15.7 mph
P10–P90: 5.8 — 25.5 mph
Recorded extremes

2.2 — 35.8 mph

Circular concentration: 10%

Compared With Previous Aprils

Historical baseline from 4,295 observations across 6 years.

Wave Height
8.4ft
0.5ft below mean
Historical mean 8.9ft
Wave Period
7s
0.2s below mean
Historical mean 7.2s
Water Temperature
11.4°C
0.9°C below mean
Historical mean 12.3°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 Apr 2016Last observation shown
Metric
Mean wave height (ft)101411988151113171210910765391075443541--
Mean observed period(s)7Reported8Reported8Reported8Reported8Reported7Reported9Reported8Reported8Reported10Reported8Reported7Reported7Reported6Reported6Reported5Reported6Reported5Reported6Reported6Reported6Reported6Reported6Reported5Reported6Reported7Reported9Reported10Reported--
Mean wave power(kW/m)------------------------------
Mean wind directionSSWconcentration 98%SSEconcentration 96%SSWconcentration 79%NWconcentration 95%WNWconcentration 91%WNWconcentration 86%NNWconcentration 98%WNWconcentration 80%WSWconcentration 74%SSWconcentration 96%SSEconcentration 95%SSEconcentration 96%Sconcentration 98%Sconcentration 45%NWconcentration 88%Nconcentration 94%NNEconcentration 96%ENEconcentration 87%Econcentration 99%Econcentration 100%SSEconcentration 66%SSWconcentration 88%NEconcentration 53%NNEconcentration 83%NWconcentration 85%NNEconcentration 92%Wconcentration 53%Wconcentration 74%--
Mean wind speed (mph)242614131319221824191920172615149102621671110101368--
Mean water temperature(°C)11.511.511.511.611.611.611.511.511.411.411.411.411.411.411.511.611.611.711.611.611.812.112.312.210.910.710.07.3--

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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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