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Sevenstones wave buoy daily means for Feb 2020

Daily means from the Sevenstones wave buoy for Feb 2020, 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

693 wave-buoy observations covered all 29 days. Typical wave height was 12.8 ft (10th–90th percentile 6.9–21 ft), while the reported wave period averaged 9.6 seconds (10th–90th percentile 8–11 seconds). Typical wind was 32.2 mph (10th–90th percentile 16.1–46.1 mph) and mean water temperature was 9.8°C (10th–90th percentile 9.5–10.2°C). 7 of 3,465 checked values (0.2%) were excluded by quality control. Across 9 comparable years, mean wave height was above the same-month mean of 9.4 ft and mean wave period was above the same-month mean of 9.1 seconds.

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

Typical Significant Wave Height

12.8ft
Mean: 13.4 ft
P10–P90: 6.9 — 21 ft
Recorded extremes

3 — 27.9 ft

Available for 687 of 693 hourly samples

Mean Observed Wave Period

9.6secs
P10–P90: 8 — 11secs
Recorded extremes

7 — 14secs

Typical Observed Wind

WSW, 32.2mph
Mean: 31.5 mph
P10–P90: 16.1 — 46.1 mph
Recorded extremes

2.2 — 57.5 mph

Circular concentration: 66%

Available for 692 of 693 hourly samples

Mean Water Temperature

9.8°C
P10–P90: 9.5 — 10.2°C
Recorded extremes

9.2 — 10.3°C

Compared With Previous Februarys

Historical baseline from 5,998 observations across 9 years.

Wave Height
13.4ft
4ft above mean
Historical mean 9.416ft
Wave Period
9.6s
0.5s above mean
Historical mean 9.1s
Water Temperature
9.8°C
0.1°C above mean
Historical mean 9.7°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 Feb 2020Last observation shown
Metric
Mean significant wave height (ft)129129557112023201218131921211311141315141213149916
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)108108998910111110101011111210991010109910889
Mean peak wave direction-----------------------------
Mean wave direction-----------------------------
Mean directional spread (°)-----------------------------
Mean wind directionWSWconcentration 73%WSWconcentration 93%WNWconcentration 86%NNWconcentration 95%ESEconcentration 64%ESEconcentration 96%Sconcentration 85%SWconcentration 89%WSWconcentration 90%Wconcentration 98%WNWconcentration 98%WSWconcentration 73%Wconcentration 89%SSWconcentration 96%SSWconcentration 98%WSWconcentration 94%Wconcentration 96%Wconcentration 95%WSWconcentration 86%Wconcentration 71%WSWconcentration 98%WSWconcentration 97%WSWconcentration 93%WSWconcentration 90%WNWconcentration 96%WNWconcentration 74%WNWconcentration 52%SSWconcentration 94%Wconcentration 99%
Mean wind speed (mph)2431262912283034494740274025302038332833323028343730253440
Mean water temperature(°C)10.210.210.210.110.110.010.010.010.19.99.79.79.89.910.010.09.89.79.79.79.69.79.79.79.59.39.59.69.5

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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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