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K7 wave buoy daily means for Jan 2011

Daily means from the K7 wave buoy for Jan 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

741 wave-buoy observations covered all 31 days. Typical wave height was 11.2 ft (10th–90th percentile 7.5–18 ft), while mean reported wave period; measurement type unavailable was 7.6 seconds (10th–90th percentile 6–9 seconds). Typical wind was 20.8 mph (10th–90th percentile 10.3–28.9 mph) and mean water temperature was 8.7°C (10th–90th percentile 8–9°C). 2 of 3,703 checked values (0.1%) were excluded by quality control.

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

Typical Wave Height

11.2ft
Mean: 12 ft
P10–P90: 7.5 — 18 ft
Recorded extremes

5.9 — 25.6 ft

Available for 740 of 741 hourly samples

Mean Wave Period

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

5 — 11secs

Mean Water Temperature

8.7°C
P10–P90: 8 — 9°C
Recorded extremes

7 — 10°C

Available for 740 of 741 hourly samples

Typical Wind

W, 20.8mph
Mean: 20.6 mph
P10–P90: 10.3 — 28.9 mph
Recorded extremes

3.4 — 39.2 mph

Circular concentration: 42%

Available for 740 of 741 hourly samples

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 Jan 2011Last observation shown
Metric
Mean wave height (ft)15129713191510131091213111717141211181398111010QC rejected910QC rejectedQC rejected
Mean observed period(s)8Reported9Reported8Reported7Reported8Reported9Reported9Reported8Reported7Reported8Reported7Reported7Reported7Reported7Reported8Reported9Reported8Reported7Reported8Reported9Reported8Reported7Reported7Reported7Reported7Reported7Reported7Reported7Reported7Reported7Reported9Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionNconcentration 99%WNWconcentration 72%WSWconcentration 90%SSEconcentration 76%NNEconcentration 95%NWconcentration 95%Wconcentration 72%NEconcentration 78%NNWconcentration 93%NNWconcentration 79%Nconcentration 90%Econcentration 96%Econcentration 98%SSEconcentration 63%SSWconcentration 93%SWconcentration 97%Wconcentration 98%Wconcentration 97%WSWconcentration 90%SWconcentration 95%Wconcentration 99%Wconcentration 99%Wconcentration 98%NWconcentration 83%NWconcentration 54%Nconcentration 89%WSWconcentration 99%WSWconcentration 94%Wconcentration 82%WSWconcentration 94%SWconcentration 88%
Mean wind speed (mph)2515151225301715258172427233020222315261919212220151624182725
Mean water temperature(°C)9.09.59.48.58.07.87.57.98.28.88.59.08.89.09.09.09.09.09.09.09.09.09.09.08.98.79.09.08.68.08.0

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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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