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Brittany wave buoy daily means for Jun 2020

Daily means from the Brittany wave buoy for Jun 2020, 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

719 wave-buoy observations covered all 30 days. Typical wave height was 5.9 ft (10th–90th percentile 3.3–9.8 ft), while mean reported wave period; measurement type unavailable was 5.8 seconds (10th–90th percentile 5–7 seconds). Typical wind was 15 mph (10th–90th percentile 9.2–24.2 mph) and mean water temperature was 14°C. 7 of 2,877 checked values (0.2%) were excluded by quality control. Across 10 comparable years, mean wave height was above the same-month mean of 6.2 ft and mean wave period was below the same-month mean of 6.2 seconds.

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

Typical Wave Height

5.9ft
Mean: 6.3 ft
P10–P90: 3.3 — 9.8 ft
Recorded extremes

1.6 — 21 ft

Available for 714 of 719 hourly samples

Mean Wave Period

5.8secs
P10–P90: 5 — 7secs
Recorded extremes

4 — 9secs

Available for 717 of 719 hourly samples

Mean Water Temperature

14°C
P10–P90: 14 — 14°C
Recorded extremes

14 — 14°C

Available for 1 of 719 hourly samples

Typical Wind

NW, 15mph
Mean: 15.8 mph
P10–P90: 9.2 — 24.2 mph
Recorded extremes

2.2 — 39.1 mph

Circular concentration: 51%

Compared With Previous Junes

Historical baseline from 7,005 observations across 10 years.

Wave Height
6.3ft
0.1ft above mean
Historical mean 6.2ft
Wave Period
5.8s
0.4s below mean
Historical mean 6.2s
Water Temperature
14°C
1.2°C below mean
Historical mean 15.2°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 Jun 2020Last observation shown
Metric
Mean wave height (ft)444888753312117445454611978668687
Mean observed period(s)5Reported4Reported4Reported6Reported6Reported6Reported6Reported5Reported5Reported5Reported7Reported7Reported5Reported5Reported5Reported5Reported5Reported6Reported5Reported5Reported8Reported8Reported8Reported8Reported6Reported6Reported6Reported6Reported6Reported6Reported
Mean wave power(kW/m)------------------------------
Mean wind directionENEconcentration 95%NEconcentration 99%Nconcentration 99%NNWconcentration 95%NWconcentration 98%NNWconcentration 96%NNWconcentration 96%Nconcentration 98%NNWconcentration 97%Wconcentration 72%Nconcentration 90%Nconcentration 94%WNWconcentration 96%Wconcentration 88%Wconcentration 99%NWconcentration 95%NWconcentration 96%WNWconcentration 95%WSWconcentration 78%SSWconcentration 88%WSWconcentration 96%Sconcentration 98%SEconcentration 69%NNEconcentration 95%NNWconcentration 95%SWconcentration 85%Wconcentration 97%WNWconcentration 96%Wconcentration 88%WSWconcentration 95%
Mean wind speed (mph)1315182122191815813292618101217131312191315813151720131615
Mean water temperature(°C)-----------------------------14.0

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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