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K7 wave buoy daily means for Jul 2010

Daily means from the K7 wave buoy for Jul 2010, 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

729 wave-buoy observations covered all 31 days. Typical wave height was 5.9 ft (10th–90th percentile 3.6–11.5 ft), while mean reported wave period; measurement type unavailable was 6 seconds (10th–90th percentile 5–7 seconds). Typical wind was 15 mph (10th–90th percentile 5.8–26.4 mph). 2 of 2,915 checked values (0.1%) were excluded by quality control.

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

Typical Wave Height

5.9ft
Mean: 7 ft
P10–P90: 3.6 — 11.5 ft
Recorded extremes

3 — 26.9 ft

Available for 728 of 729 hourly samples

Mean Wave Period

6secs
P10–P90: 5 — 7secs
Recorded extremes

4 — 11secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 729 hourly samples

Typical Wind

Variable, 15mph
Mean: 15.1 mph
P10–P90: 5.8 — 26.4 mph
Recorded extremes

2.2 — 33.4 mph

Circular concentration: 21%

Available for 728 of 729 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 Jul 2010Last observation shown
Metric
Mean wave height (ft)991110781617946445129885655457556555
Mean observed period(s)6Reported8Reported7Reported7Reported6Reported7Reported8Reported8Reported7Reported6Reported5Reported6Reported5Reported5Reported7Reported7Reported6Reported6Reported6Reported6Reported5Reported5Reported6Reported5Reported7Reported6Reported5Reported7Reported6Reported6Reported5Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionESEconcentration 95%SSEconcentration 80%Sconcentration 98%Sconcentration 76%Wconcentration 98%SSWconcentration 65%Sconcentration 99%SSWconcentration 99%SWconcentration 97%SSWconcentration 75%Nconcentration 64%SSWconcentration 56%Econcentration 98%ENEconcentration 97%Nconcentration 85%SSEconcentration 47%SSWconcentration 93%SSWconcentration 95%Variableconcentration 11%NNEconcentration 98%Nconcentration 92%Nconcentration 96%SSEconcentration 92%Sconcentration 99%SWconcentration 33%Sconcentration 67%SSWconcentration 83%Nconcentration 53%NNWconcentration 93%ENEconcentration 69%ENEconcentration 90%
Mean wind speed (mph)23132316171528271710231014202312181741717129166911911616
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.

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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