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K7 wave buoy daily means for Sep 2011

Daily means from the K7 wave buoy for Sep 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

707 wave-buoy observations covered all 30 days. Typical wave height was 8.5 ft (10th–90th percentile 5.2–12.5 ft), while mean reported wave period; measurement type unavailable was 6.9 seconds (10th–90th percentile 6–8 seconds). Typical wind was 17.3 mph (10th–90th percentile 8.1–25.3 mph) and mean water temperature was 11.8°C (10th–90th percentile 11–12.5°C). 1 of 3,535 checked values (0%) were excluded by quality control. Across 1 comparable year, mean wave height was below the same-month mean of 9.2 ft and mean wave period was below the same-month mean of 7 seconds.

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

Typical Wave Height

8.5ft
Mean: 8.7 ft
P10–P90: 5.2 — 12.5 ft
Recorded extremes

3.6 — 17.1 ft

Available for 706 of 707 hourly samples

Mean Wave Period

6.9secs
P10–P90: 6 — 8secs
Recorded extremes

5 — 12secs

Mean Water Temperature

11.8°C
P10–P90: 11 — 12.5°C
Recorded extremes

10.5 — 12.8°C

Typical Wind

S, 17.3mph
Mean: 17.1 mph
P10–P90: 8.1 — 25.3 mph
Recorded extremes

2.3 — 35.7 mph

Circular concentration: 36%

Compared With Previous Septembers

Historical baseline from 719 observations across 1 year.

Wave Height
8.7ft
0.5ft below mean
Historical mean 9.2ft
Wave Period
6.9s
0.1s below mean
Historical mean 7s
Water Temperature
11.8°C
Not enough comparable data

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 Sep 2011Last observation shown
Metric
Mean wave height (ft)479756998886111499109611151179128810107
Mean observed period(s)6Reported6Reported7Reported7Reported7Reported5Reported7Reported7Reported7Reported6Reported7Reported7Reported10Reported8Reported8Reported7Reported6Reported7Reported6Reported8Reported8Reported7Reported7Reported7Reported8Reported6Reported6Reported7Reported8Reported7Reported
Mean wave power(kW/m)------------------------------
Mean wind directionSSEconcentration 96%Sconcentration 89%Sconcentration 98%Sconcentration 98%Econcentration 83%NEconcentration 71%Wconcentration 95%Wconcentration 98%Variableconcentration 24%Econcentration 99%SEconcentration 90%Econcentration 68%NWconcentration 97%NWconcentration 86%WNWconcentration 51%SEconcentration 98%ENEconcentration 92%NEconcentration 97%Sconcentration 81%SWconcentration 96%SSWconcentration 88%Wconcentration 100%Sconcentration 70%Sconcentration 98%Sconcentration 92%WSWconcentration 88%SSWconcentration 93%SSWconcentration 97%Sconcentration 98%Sconcentration 81%
Mean wind speed (mph)1219151162121191021111116239212415132225221422201920231215
Mean water temperature(°C)11.611.611.912.312.412.412.212.112.211.912.312.612.612.112.011.211.211.211.912.111.511.011.211.110.810.811.211.811.511.8

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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