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K7 wave buoy daily means for Feb 2011

Daily means from the K7 wave buoy for Feb 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

671 wave-buoy observations covered all 28 days. Typical wave height was 16.1 ft (10th–90th percentile 10.5–25.2 ft), while mean reported wave period; measurement type unavailable was 8.8 seconds (10th–90th percentile 7–11 seconds). Typical wind was 25.3 mph (10th–90th percentile 13.9–33.4 mph) and mean water temperature was 8.2°C (10th–90th percentile 8–9°C). 8 of 3,355 checked values (0.2%) were excluded by quality control.

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

Typical Wave Height

16.1ft
Mean: 17.5 ft
P10–P90: 10.5 — 25.2 ft
Recorded extremes

5.9 — 52.2 ft

Available for 663 of 671 hourly samples

Mean Wave Period

8.8secs
P10–P90: 7 — 11secs
Recorded extremes

6 — 14secs

Mean Water Temperature

8.2°C
P10–P90: 8 — 9°C
Recorded extremes

7 — 9°C

Typical Wind

SSW, 25.3mph
Mean: 24.8 mph
P10–P90: 13.9 — 33.4 mph
Recorded extremes

3.4 — 56.4 mph

Circular concentration: 52%

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 Feb 2011Last observation shown
Metric
Mean wave height (ft)242634342019141214171421222017141291614139121921171513
Mean observed period(s)10Reported10Reported12Reported12Reported10Reported9Reported8Reported7Reported8Reported11Reported9Reported10Reported10Reported11Reported9Reported8Reported7Reported6Reported8Reported8Reported7Reported7Reported7Reported9Reported9Reported9Reported9Reported9Reported
Mean wave power(kW/m)----------------------------
Mean wind directionWSWconcentration 97%SWconcentration 92%SWconcentration 78%Wconcentration 92%WSWconcentration 96%WSWconcentration 95%Wconcentration 96%WSWconcentration 30%Sconcentration 91%NWconcentration 77%ESEconcentration 90%SSEconcentration 98%SSEconcentration 96%Variableconcentration 22%SSEconcentration 96%ESEconcentration 98%ESEconcentration 97%SSEconcentration 98%SEconcentration 98%SSEconcentration 100%SSEconcentration 100%SSEconcentration 99%Sconcentration 88%SSWconcentration 98%SSWconcentration 98%WSWconcentration 94%Wconcentration 85%SWconcentration 91%
Mean wind speed (mph)33323632202219192117252825162725232232282621262930211921
Mean water temperature(°C)8.08.08.08.08.08.88.88.28.18.58.37.58.08.08.08.08.98.98.78.08.08.08.08.08.39.08.58.2

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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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