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Sevenstones wave buoy daily means for Oct 2014

Daily means from the Sevenstones wave buoy for Oct 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

743 wave-buoy observations covered all 31 days. Typical wave height was 7.2 ft (10th–90th percentile 2.6–11.2 ft), while the reported wave period averaged 8.4 seconds (10th–90th percentile 6–10 seconds). Typical wind was 20.8 mph (10th–90th percentile 11.4–31.1 mph) and mean water temperature was 14.8°C (10th–90th percentile 14.3–15.7°C). 2 of 3,715 checked values (0.1%) were excluded by quality control. Across 4 comparable years, mean wave height was above the same-month mean of 6.2 ft and mean wave period was above the same-month mean of 8 seconds.

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

Typical Significant Wave Height

7.2ft
Mean: 7.3 ft
P10–P90: 2.6 — 11.2 ft
Recorded extremes

1.3 — 17.1 ft

Available for 742 of 743 hourly samples

Mean Observed Wave Period

8.4secs
P10–P90: 6 — 10secs
Recorded extremes

5 — 13secs

Available for 742 of 743 hourly samples

Typical Observed Wind

SW, 20.8mph
Mean: 20.9 mph
P10–P90: 11.4 — 31.1 mph
Recorded extremes

2.2 — 49.4 mph

Circular concentration: 56%

Mean Water Temperature

14.8°C
P10–P90: 14.3 — 15.7°C
Recorded extremes

14.1 — 16.7°C

Compared With Previous Octobers

Historical baseline from 2,918 observations across 4 years.

Wave Height
7.3ft
1.1ft above mean
Historical mean 6.2ft
Wave Period
8.4s
0.4s above mean
Historical mean 8s
Water Temperature
14.8°C
0.6°C above mean
Historical mean 14.2°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 2014Last observation shown
Metric
Mean significant wave height (ft)QC rejected88871281111532327101011117129678986435
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)9111089999876666810999889899998877
Mean peak wave direction-------------------------------
Mean wave direction-------------------------------
Mean directional spread (°)-------------------------------
Mean wind directionWSWconcentration 54%SEconcentration 56%SSWconcentration 95%NWconcentration 77%SSWconcentration 79%WSWconcentration 75%WSWconcentration 91%SWconcentration 93%WSWconcentration 95%SWconcentration 96%WSWconcentration 88%ENEconcentration 76%Nconcentration 94%ENEconcentration 44%Sconcentration 81%Sconcentration 96%Sconcentration 98%Sconcentration 98%WSWconcentration 93%WSWconcentration 98%WNWconcentration 85%WNWconcentration 88%SWconcentration 98%WSWconcentration 84%WSWconcentration 97%SSWconcentration 91%Sconcentration 98%SSWconcentration 91%SSEconcentration 78%Sconcentration 99%Sconcentration 94%
Mean wind speed (mph)1092025222623293018131719122321282824223720201619222220122024
Mean water temperature(°C)15.916.016.115.615.515.214.914.914.915.015.014.814.714.614.614.514.414.414.614.814.714.414.514.514.314.314.314.314.314.314.3

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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.

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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