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Sevenstones wave buoy daily means for Mar 2016

Daily means from the Sevenstones wave buoy for Mar 2016, 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

730 wave-buoy observations covered all 31 days. Typical wave height was 6.9 ft (10th–90th percentile 3–14.1 ft), while the reported wave period averaged 8.6 seconds (10th–90th percentile 7–10 seconds). Typical wind was 19.7 mph (10th–90th percentile 9.2–35.8 mph). 15 of 2,920 checked values (0.5%) were excluded by quality control. Across 6 comparable years, mean wave height was above the same-month mean of 5.9 ft and mean wave period was above the same-month mean of 8.5 seconds.

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

Typical Significant Wave Height

6.9ft
Mean: 7.6 ft
P10–P90: 3 — 14.1 ft
Recorded extremes

1.6 — 23 ft

Available for 723 of 730 hourly samples

Mean Observed Wave Period

8.6secs
P10–P90: 7 — 10secs
Recorded extremes

6 — 14secs

Available for 722 of 730 hourly samples

Typical Observed Wind

Variable, 19.7mph
Mean: 21.4 mph
P10–P90: 9.2 — 35.8 mph
Recorded extremes

2.2 — 55.3 mph

Circular concentration: 26%

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 730 hourly samples

Compared With Previous Marchs

Historical baseline from 4,003 observations across 6 years.

Wave Height
7.6ft
1.7ft above mean
Historical mean 5.9ft
Wave Period
8.6s
0.1s above mean
Historical mean 8.5s
Water Temperature
–
Not enough comparable data
Historical mean 9.5°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 Mar 2016Last observation shown
Metric
Mean significant wave height (ft)9171011126751575766534443226871315141096
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)81099988888911988779667101199101010999
Mean peak wave direction-------------------------------
Mean wave direction-------------------------------
Mean directional spread (°)-------------------------------
Mean wind directionWconcentration 96%WNWconcentration 98%WNWconcentration 77%NNWconcentration 91%Nconcentration 99%NNWconcentration 50%Nconcentration 92%WSWconcentration 79%NNWconcentration 93%Nconcentration 98%Sconcentration 61%Sconcentration 98%Econcentration 94%Econcentration 99%ENEconcentration 81%NEconcentration 91%Econcentration 98%ENEconcentration 90%ENEconcentration 94%NEconcentration 94%NNEconcentration 79%NNWconcentration 48%NWconcentration 54%WSWconcentration 92%WSWconcentration 45%SWconcentration 88%SWconcentration 72%Wconcentration 92%WSWconcentration 95%WNWconcentration 89%NNWconcentration 84%
Mean wind speed (mph)3038262831171919QC rejected208111123201721142118135112519333132291713
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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