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Belle-Île wave buoy daily means for Jan 2014

Daily means from the Belle-Île 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

1,488 wave-buoy observations covered all 31 days. Typical wave height was 11 ft (10th–90th percentile 6.7–18.9 ft), while mean peak wave period was 12.7 seconds (10th–90th percentile 10.1–15.8 seconds). Typical calculated wave power was approximately 59.2 kW/m (10th–90th percentile 18.6–199.4 kW/m), derived from significant wave height and energy period. 8 of 4,464 checked values (0.2%) were excluded by quality control. Across 3 comparable years, mean wave height was above the same-month mean of 6.8 ft and mean wave period was above the same-month mean of 11.7 seconds.

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

Typical Significant Wave Height

11ft
Mean: 12.1 ft
P10–P90: 6.7 — 18.9 ft
Recorded extremes

3.8 — 30.4 ft

Mean Observed Wave Period

12.7secs
P10–P90: 10.1 — 15.8secs
Recorded extremes

5.1 — 21.2secs

Typical Wave Power

Approximately 59.21kW/m
Mean: 88.96kW/m
P10–P90: 18.64 — 199.38kW/m
Recorded extremes

5.32 — 760.91kW/m

Calculated from significant wave height and energy period.

Typical Observed Wind

-, -mph
Mean: - mph
P10–P90: - — - mph

Available for 0 of 744 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 744 hourly samples

Compared With Previous Januarys

Historical baseline from 3,673 observations across 3 years.

Wave Height
12.1ft
5.3ft above mean
Historical mean 6.791ft
Wave Period
12.7s
1s above mean
Historical mean 11.7s
Water Temperature
–
Not enough comparable data

Chart showing grouped wave observations for Belle-Île. 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 Belle-Île wave buoy

Belle-Île is a CANDHIS directional buoy south of Brittany, maintained through the Cerema-coordinated sea-state observatory and research partners. Its open Atlantic position represents conditions approaching Belle-Île and the sheltered-to-exposed transition along the Morbihan coast.

Its current data source reports wave height, wave period, wave direction, directional spread and sea temperature.

Metrics are rows; days run left to right.
Belle-Île wave buoy daily means Jan 2014Last observation shown
Metric
Mean significant wave height (ft)20151719172220129556121211QC rejected1412887109991318151199
Mean maximum wave height (ft)312325292632301814881017181723211812121114141514202722171413
Mean peak period (s)1413131514151614111112111213121213141211914121011141515131210
Mean average period (s)1211111211131412910108911101011111098111091012121211109
Mean period Tm02 (s)988981010877867878888768767899887
Mean peak wave directionWconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%WSWconcentration 87%Wconcentration 99%Wconcentration 99%Wconcentration 99%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 88%Wconcentration 99%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 100%Wconcentration 96%
Mean directional spread (°)25.127.425.125.526.225.525.225.429.832.630.434.228.726.829.026.525.825.928.029.533.826.129.229.028.926.624.225.327.027.430.7
Mean water temperature(°C)-------------------------------

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.

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 Cerema CANDHIS coastal wave observatory.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

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