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Sevenstones wave buoy daily means for Oct 2015

Daily means from the Sevenstones wave buoy for Oct 2015, 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

735 wave-buoy observations covered all 31 days. Typical wave height was 5.2 ft (10th–90th percentile 1.6–9.8 ft), while the reported wave period averaged 8.1 seconds (10th–90th percentile 6–11 seconds). Typical wind was 18.3 mph (10th–90th percentile 10.3–27.7 mph). 25 of 2,940 checked values (0.9%) were excluded by quality control. Across 5 comparable years, mean wave height was below the same-month mean of 6.4 ft and mean wave period was the same as the same-month mean of 8.1 seconds.

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

Typical Significant Wave Height

5.2ft
Mean: 5.4 ft
P10–P90: 1.6 — 9.8 ft
Recorded extremes

0 — 18.7 ft

Available for 722 of 735 hourly samples

Mean Observed Wave Period

8.1secs
P10–P90: 6 — 11secs
Recorded extremes

5 — 14secs

Available for 723 of 735 hourly samples

Typical Observed Wind

Variable, 18.3mph
Mean: 18.6 mph
P10–P90: 10.3 — 27.7 mph
Recorded extremes

3.4 — 43.8 mph

Circular concentration: 28%

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 735 hourly samples

Compared With Previous Octobers

Historical baseline from 3,661 observations across 5 years.

Wave Height
5.4ft
1ft below mean
Historical mean 6.4ft
Wave Period
8.1s
In line with the historical mean
Historical mean 8.1s
Water Temperature
–
Not enough comparable data
Historical mean 14.3°C

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, near the Seven Stones reef in the Western Approaches. Its exposed offshore position shows Atlantic systems before they reach Cornwall and the western English Channel and provides context for a notoriously hazardous shipping area.

Its current data source reports wave height, wave period, wave direction, directional spread, wind conditions, sea temperature, separate swell and wind-sea components and wave spectra.

Metrics are rows; days run left to right.
Sevenstones wave buoy daily means Oct 2015Last observation shown
Metric
Mean significant wave height (ft)321378975453454322224910788869QC rejected8
Mean maximum wave height (ft)-------------------------------
Mean maximum crest height (ft)-------------------------------
Mean maximum trough height (ft)-------------------------------
Mean peak period (s)-------------------------------
Mean average period (s)-------------------------------
Mean period Tm02 (s)-------------------------------
Mean zero-crossing period (s)-------------------------------
Mean maximum wave period (s)-------------------------------
Mean reported period (s)66778891098867131186566791189810881110
Mean peak wave direction-------------------------------
Mean wave direction-------------------------------
Mean directional spread (°)-------------------------------
Mean wind directionNEconcentration 94%NEconcentration 90%NEconcentration 92%SEconcentration 97%Sconcentration 93%Variableconcentration 24%WNWconcentration 91%SSWconcentration 87%SEconcentration 87%Econcentration 92%ENEconcentration 92%NNEconcentration 100%NEconcentration 93%ENEconcentration 92%ENEconcentration 93%ENEconcentration 97%ENEconcentration 95%ENEconcentration 94%NEconcentration 87%NNWconcentration 74%Wconcentration 97%WNWconcentration 93%SSWconcentration 92%WNWconcentration 42%SSWconcentration 61%SSEconcentration 94%SSEconcentration 97%SSEconcentration 92%SSWconcentration 69%SSEconcentration 70%Econcentration 78%
Mean wind speed (mph)17151125242418111921172320141417191613142118182319282124212210
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 Met Office Marine observations.

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

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