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Brittany wave buoy daily means for Jan 2014

Daily means from the Brittany wave buoy for Jan 2014, 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

737 wave-buoy observations covered all 31 days. Typical wave height was 15.4 ft (10th–90th percentile 9.8–26.9 ft), while mean reported wave period; measurement type unavailable was 8.7 seconds (10th–90th percentile 7–11 seconds). Typical wind was 24.2 mph (10th–90th percentile 13.8–33.3 mph) and mean water temperature was 12.1°C (10th–90th percentile 11.9–12.5°C). 8 of 3,685 checked values (0.2%) were excluded by quality control. Across 3 comparable years, mean wave height was above the same-month mean of 12.3 ft and mean wave period was above the same-month mean of 8.2 seconds.

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

Typical Wave Height

15.4ft
Mean: 16.8 ft
P10–P90: 9.8 — 26.9 ft
Recorded extremes

6.2 — 42 ft

Available for 730 of 737 hourly samples

Mean Wave Period

8.7secs
P10–P90: 7 — 11secs
Recorded extremes

6 — 14secs

Mean Water Temperature

12.1°C
P10–P90: 11.9 — 12.5°C
Recorded extremes

11.8 — 12.7°C

Typical Wind

WSW, 24.2mph
Mean: 23.6 mph
P10–P90: 13.8 — 33.3 mph
Recorded extremes

3.4 — 41.4 mph

Circular concentration: 71%

Available for 736 of 737 hourly samples

Compared With Previous Januarys

Historical baseline from 1,626 observations across 3 years.

Wave Height
16.8ft
4.5ft above mean
Historical mean 12.3ft
Wave Period
8.7s
0.5s above mean
Historical mean 8.2s
Water Temperature
12.1°C
0.1°C below mean
Historical mean 12.2°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 Jan 2014Last observation shown
Metric
Mean wave height (ft)24172722213324151079121715151915141212916121414213022171413
Mean observed period(s)10Reported8Reported11Reported10Reported9Reported12Reported11Reported8Reported7Reported6Reported8Reported7Reported9Reported9Reported8Reported9Reported9Reported9Reported8Reported8Reported7Reported9Reported7Reported8Reported9Reported10Reported11Reported10Reported9Reported8Reported7Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionSWconcentration 90%SWconcentration 89%WSWconcentration 98%Wconcentration 95%SSWconcentration 96%SWconcentration 99%SWconcentration 97%SSWconcentration 81%WSWconcentration 92%SSWconcentration 84%Econcentration 49%SSWconcentration 69%WSWconcentration 93%WSWconcentration 96%SWconcentration 96%WSWconcentration 97%Variableconcentration 25%WNWconcentration 83%WNWconcentration 95%Wconcentration 71%WSWconcentration 78%WNWconcentration 97%WNWconcentration 95%Wconcentration 100%Wconcentration 98%WSWconcentration 86%WNWconcentration 98%WNWconcentration 94%NNWconcentration 97%NWconcentration 91%WSWconcentration 90%
Mean wind speed (mph)33253225303423251517182723172527101619162023212718313424262326
Mean water temperature(°C)12.712.612.612.412.312.312.212.212.212.212.112.112.112.112.012.012.012.112.012.011.911.911.911.912.011.912.012.011.911.911.8

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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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