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Sevenstones wave buoy daily means for Nov 2013

Daily means from the Sevenstones wave buoy for Nov 2013, 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

688 wave-buoy observations covered all 30 days. Typical wave height was 7.5 ft (10th–90th percentile 2.6–12.1 ft), while the reported wave period averaged 8.8 seconds (10th–90th percentile 7–11 seconds). Typical wind was 19.7 mph (10th–90th percentile 8.1–34.4 mph) and mean water temperature was 12.8°C (10th–90th percentile 12.2–13.4°C). 2 of 3,440 checked values (0.1%) were excluded by quality control. Across 3 comparable years, mean wave height was below the same-month mean of 8 ft and mean wave period was above the same-month mean of 8.6 seconds.

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

Typical Significant Wave Height

7.5ft
Mean: 7.7 ft
P10–P90: 2.6 — 12.1 ft
Recorded extremes

2.3 — 24 ft

Available for 687 of 688 hourly samples

Mean Observed Wave Period

8.8secs
P10–P90: 7 — 11secs
Recorded extremes

6 — 13secs

Available for 687 of 688 hourly samples

Typical Observed Wind

NNW, 19.7mph
Mean: 20.4 mph
P10–P90: 8.1 — 34.4 mph
Recorded extremes

2.2 — 46 mph

Circular concentration: 46%

Mean Water Temperature

12.8°C
P10–P90: 12.2 — 13.4°C
Recorded extremes

11.9 — 14°C

Compared With Previous Novembers

Historical baseline from 2,140 observations across 3 years.

Wave Height
7.7ft
0.3ft below mean
Historical mean 8ft
Wave Period
8.8s
0.2s above mean
Historical mean 8.6s
Water Temperature
12.8°C
0.2°C above mean
Historical mean 12.6°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 Nov 2013Last observation shown
Metric
Mean significant wave height (ft)12151411111291191098711856589104333334QC rejectedQC rejected
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)121091099910810109109991197787679981097
Mean peak wave direction------------------------------
Mean wave direction------------------------------
Mean directional spread (°)------------------------------
Mean wind directionSSWconcentration 31%Wconcentration 82%Wconcentration 82%NWconcentration 68%Wconcentration 98%WSWconcentration 91%Wconcentration 97%Wconcentration 87%Wconcentration 80%Wconcentration 39%WSWconcentration 96%Nconcentration 94%Wconcentration 66%NNWconcentration 97%Nconcentration 98%NNWconcentration 76%NNEconcentration 88%NNWconcentration 69%NNWconcentration 97%NWconcentration 87%NNEconcentration 93%NEconcentration 94%NEconcentration 88%ENEconcentration 84%ENEconcentration 86%NEconcentration 59%Nconcentration 98%NEconcentration 90%NNWconcentration 95%NNEconcentration 95%
Mean wind speed (mph)1631341528311622271818201733201110162836311615111391792222
Mean water temperature(°C)14.013.813.413.413.413.313.113.013.012.913.013.012.912.812.712.712.712.612.312.412.412.312.312.312.212.112.212.212.212.1

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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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