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Brittany wave buoy daily means for Nov 2011

Daily means from the Brittany wave buoy for Nov 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

720 wave-buoy observations covered all 30 days. Typical wave height was 11.5 ft (10th–90th percentile 7.2–16.4 ft), while mean reported wave period; measurement type unavailable was 8.4 seconds (10th–90th percentile 7–10 seconds). Typical wind was 17.3 mph (10th–90th percentile 8.1–26.5 mph) and mean water temperature was 15°C (10th–90th percentile 14.6–15.3°C). 2 of 3,600 checked values (0.1%) were excluded by quality control. Across 1 comparable year, mean wave height was below the same-month mean of 17.1 ft and mean wave period was below the same-month mean of 9.2 seconds.

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

Typical Wave Height

11.5ft
Mean: 11.8 ft
P10–P90: 7.2 — 16.4 ft
Recorded extremes

4.3 — 22.6 ft

Available for 719 of 720 hourly samples

Mean Wave Period

8.4secs
P10–P90: 7 — 10secs
Recorded extremes

6 — 12secs

Available for 719 of 720 hourly samples

Mean Water Temperature

15°C
P10–P90: 14.6 — 15.3°C
Recorded extremes

13.8 — 15.6°C

Typical Wind

SSW, 17.3mph
Mean: 17 mph
P10–P90: 8.1 — 26.5 mph
Recorded extremes

2.3 — 39.1 mph

Circular concentration: 39%

Compared With Previous Novembers

Historical baseline from 710 observations across 1 year.

Wave Height
11.8ft
5.3ft below mean
Historical mean 17.1ft
Wave Period
8.4s
0.8s below mean
Historical mean 9.2s
Water Temperature
15°C
0.6°C above mean
Historical mean 14.4°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 Nov 2011Last observation shown
Metric
Mean wave height (ft)15181913119671113141314108813151597141111121012111514
Mean observed period(s)10Reported9Reported11Reported10Reported9Reported8Reported7Reported6Reported8Reported9Reported8Reported9Reported8Reported8Reported7Reported7Reported8Reported8Reported10Reported9Reported8Reported9Reported10Reported9Reported9Reported9Reported9Reported8Reported8Reported9Reported
Mean wave power(kW/m)------------------------------
Mean wind directionSSWconcentration 80%Sconcentration 98%SWconcentration 79%NWconcentration 89%Nconcentration 98%NNEconcentration 96%Econcentration 88%SSEconcentration 89%SSWconcentration 98%SSEconcentration 95%SSWconcentration 90%SEconcentration 82%SEconcentration 88%ESEconcentration 97%ESEconcentration 81%WSWconcentration 48%SSWconcentration 99%Sconcentration 99%SEconcentration 79%SWconcentration 56%SWconcentration 51%Nconcentration 97%SWconcentration 92%SSWconcentration 91%WNWconcentration 78%SWconcentration 96%Variableconcentration 21%SSWconcentration 86%WSWconcentration 81%SWconcentration 95%
Mean wind speed (mph)212817111813818172124191916161725261251118101891514202620
Mean water temperature(°C)15.115.015.115.315.215.115.215.215.315.515.415.315.215.315.315.215.115.014.915.014.914.914.814.814.714.714.614.514.214.0

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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