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Sevenstones wave buoy daily means for Mar 2010

Daily means from the Sevenstones wave buoy for Mar 2010, 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

701 wave-buoy observations covered 30 of 31 days (97%). Typical wave height was 4.6 ft (10th–90th percentile 2–8.5 ft), while mean reported wave period; measurement type unavailable was 7.7 seconds (10th–90th percentile 6–9 seconds). Typical wind was 18.4 mph (10th–90th percentile 9.2–28.9 mph). All 2,803 checked values passed quality control.

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

Typical Wave Height

4.6ft
Mean: 5.1 ft
P10–P90: 2 — 8.5 ft
Recorded extremes

1 — 18 ft

Mean Wave Period

7.7secs
P10–P90: 6 — 9secs
Recorded extremes

6 — 11secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 701 hourly samples

Typical Wind

Variable, 18.4mph
Mean: 19 mph
P10–P90: 9.2 — 28.9 mph
Recorded extremes

2.2 — 53.1 mph

Circular concentration: 21%

Chart showing grouped wave observations for Sevenstones. 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 Sevenstones wave buoy

Sevenstones Lightship (WMO 62107) is a UK Met Office station west of Land's End in the Western Approaches. It is well placed to show Atlantic swell before it reaches Cornwall and the western English Channel. The station feed includes wave height and period, pressure, air and sea temperature, and other marine observations when available.

Metrics are rows; days run left to right.
Sevenstones wave buoy daily means Mar 2010Last observation shown
Metric
Mean wave height (ft)-4653254433321135798587769755912
Mean observed period(s)-8Reported7Reported8Reported8Reported8Reported7Reported7Reported7Reported7Reported7Reported7Reported7Reported7Reported7Reported8Reported8Reported8Reported10Reported8Reported8Reported8Reported9Reported9Reported8Reported9Reported9Reported8Reported7Reported8Reported8Reported
Mean wave power(kW/m)-------------------------------
Mean wind direction-ESEconcentration 96%ESEconcentration 94%ENEconcentration 93%NEconcentration 85%ENEconcentration 91%Econcentration 98%Econcentration 99%ENEconcentration 94%NEconcentration 94%NEconcentration 93%Nconcentration 94%NNEconcentration 94%NNWconcentration 95%Wconcentration 57%SSEconcentration 95%Sconcentration 94%SSWconcentration 92%Sconcentration 75%WSWconcentration 51%SWconcentration 91%SSWconcentration 90%SSEconcentration 91%SSEconcentration 89%Sconcentration 92%Sconcentration 100%Wconcentration 80%SWconcentration 68%Sconcentration 94%Wconcentration 58%Wconcentration 90%
Mean wind speed (mph)-17261511192823212020191411518172319231819171922231513212933
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.

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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