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K7 wave buoy daily means for Oct 2011

Daily means from the K7 wave buoy for Oct 2011, 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

744 wave-buoy observations covered all 31 days. Typical wave height was 12.1 ft (10th–90th percentile 7.9–18 ft), while mean reported wave period; measurement type unavailable was 7.6 seconds (10th–90th percentile 6–9 seconds). Typical wind was 21.9 mph (10th–90th percentile 12.7–33.4 mph) and mean water temperature was 10.1°C (10th–90th percentile 9.2–11.3°C). All 3,710 checked values passed quality control. Across 1 comparable year, mean wave height was above the same-month mean of 10.9 ft and mean wave period was above the same-month mean of 7.1 seconds.

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

Typical Wave Height

12.1ft
Mean: 12.6 ft
P10–P90: 7.9 — 18 ft
Recorded extremes

5.6 — 28.2 ft

Mean Wave Period

7.6secs
P10–P90: 6 — 9secs
Recorded extremes

5 — 10secs

Mean Water Temperature

10.1°C
P10–P90: 9.2 — 11.3°C
Recorded extremes

9.1 — 12°C

Typical Wind

SW, 21.9mph
Mean: 22.6 mph
P10–P90: 12.7 — 33.4 mph
Recorded extremes

5.8 — 52.9 mph

Circular concentration: 47%

Available for 739 of 744 hourly samples

Compared With Previous Octobers

Historical baseline from 744 observations across 1 year.

Wave Height
12.6ft
1.7ft above mean
Historical mean 10.9ft
Wave Period
7.6s
0.5s above mean
Historical mean 7.1s
Water Temperature
10.1°C
In line with the historical mean
Historical mean 10.1°C

Chart showing grouped wave observations for K7. 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 K7 wave buoy

K7 (WMO 64046) is a UK Met Office buoy west of Shetland in the North Atlantic. Its position monitors ocean weather and sea conditions approaching the Northern Isles. The international feed can include wind, pressure, air and sea temperature, and wave observations when the relevant sensors are reporting.

Metrics are rows; days run left to right.
K7 wave buoy daily means Oct 2011Last observation shown
Metric
Mean wave height (ft)771820121117121215111091112131516181311108141914QC rejected9151411
Mean observed period(s)7Reported7Reported8Reported9Reported8Reported7Reported9Reported8Reported7Reported8Reported7Reported8Reported7Reported7Reported8Reported8Reported8Reported8Reported9Reported8Reported7Reported7Reported7Reported7Reported8Reported8Reported6Reported6Reported8Reported9Reported8Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionSWconcentration 98%SSWconcentration 89%SSWconcentration 91%Wconcentration 98%Wconcentration 99%WNWconcentration 90%NWconcentration 95%Econcentration 39%Wconcentration 98%Wconcentration 99%NWconcentration 93%ENEconcentration 56%Sconcentration 98%Sconcentration 99%SSWconcentration 92%SSWconcentration 96%SWconcentration 92%NWconcentration 80%NNWconcentration 99%SWconcentration 54%SWconcentration 71%Sconcentration 91%SSEconcentration 93%SEconcentration 98%SEconcentration 98%SEconcentration 94%Sconcentration 78%SWconcentration 79%Sconcentration 98%SWconcentration 88%SSEconcentration 96%
Mean wind speed (mph)12193433312220202626231219242222262327182021153034191723252018
Mean water temperature(°C)11.811.411.210.810.811.211.311.210.110.010.110.29.99.910.010.310.310.310.19.89.49.39.49.49.49.49.29.29.29.29.6

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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.

Which wave period is shown?

The table shows the best period measurement supplied for each observation. It is not necessarily the energy period used to calculate wave power.

Tp
Peak period: the period at the strongest spectral peak.
Tavg
The provider's average wave period.
Tm02
A mean period calculated from the wave spectrum.
Tz
Mean zero-crossing period.
Reported
A legacy value whose period type was not recorded.
Mixed
A daily or monthly mean containing more than one period type.

Wave power needs a genuine energy period (Te). SurfHog does not substitute Tp, Tavg, Tm02 or Tz when Te is missing.

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 UK Met Office.

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