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Sevenstones wave buoy daily means for Jan 2014

Daily means from the Sevenstones wave buoy for Jan 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 10.8 ft (10th–90th percentile 6.9–19.7 ft), while the reported wave period averaged 9.7 seconds (10th–90th percentile 8–11 seconds). Typical wind was 24.2 mph (10th–90th percentile 12.8–36.9 mph) and mean water temperature was 10.3°C (10th–90th percentile 9.9–10.7°C). 6 of 3,715 checked values (0.2%) were excluded by quality control. Across 3 comparable years, mean wave height was above the same-month mean of 7.8 ft and mean wave period was above the same-month mean of 8.8 seconds.

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

Typical Significant Wave Height

10.8ft
Mean: 12.3 ft
P10–P90: 6.9 — 19.7 ft
Recorded extremes

4.3 — 29.9 ft

Available for 737 of 743 hourly samples

Mean Observed Wave Period

9.7secs
P10–P90: 8 — 11secs
Recorded extremes

7 — 13secs

Typical Observed Wind

WSW, 24.2mph
Mean: 24.4 mph
P10–P90: 12.8 — 36.9 mph
Recorded extremes

3.4 — 48.3 mph

Circular concentration: 61%

Mean Water Temperature

10.3°C
P10–P90: 9.9 — 10.7°C
Recorded extremes

9.8 — 11°C

Compared With Previous Januarys

Historical baseline from 2,205 observations across 3 years.

Wave Height
12.3ft
4.5ft above mean
Historical mean 7.8ft
Wave Period
9.7s
0.9s above mean
Historical mean 8.8s
Water Temperature
10.3°C
0.1°C below mean
Historical mean 10.4°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 Jan 2014Last observation shown
Metric
Mean significant wave height (ft)17122017142218118578121111141110887131010121822151189
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)11911111011111088108101010101011998119910111110999
Mean peak wave direction-------------------------------
Mean wave direction-------------------------------
Mean directional spread (°)-------------------------------
Mean wind directionSWconcentration 83%SWconcentration 83%WSWconcentration 96%WSWconcentration 75%SSWconcentration 88%SWconcentration 99%SWconcentration 99%SSWconcentration 85%Wconcentration 90%SWconcentration 83%Variableconcentration 21%Sconcentration 70%WSWconcentration 82%WSWconcentration 76%SWconcentration 97%SWconcentration 93%WSWconcentration 89%NNWconcentration 43%Wconcentration 90%NWconcentration 79%SSWconcentration 85%WNWconcentration 93%WNWconcentration 94%WNWconcentration 95%WNWconcentration 94%WSWconcentration 77%WNWconcentration 99%WNWconcentration 89%Nconcentration 98%Econcentration 43%SSWconcentration 83%
Mean wind speed (mph)3328382429372921201916282318232519131515212323252634392928QC rejected27
Mean water temperature(°C)10.910.810.710.610.610.710.710.710.610.510.510.510.310.310.510.310.310.210.110.110.210.210.210.310.310.19.99.99.89.89.8

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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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