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K7 wave buoy daily means for Nov 2020

Daily means from the K7 wave buoy for Nov 2020, 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

700 wave-buoy observations covered all 30 days. Typical wave height was 13.5 ft (10th–90th percentile 7.5–20.3 ft), while mean reported wave period; measurement type unavailable was 9 seconds (10th–90th percentile 7–11 seconds). Typical wind was 21.9 mph (10th–90th percentile 9.2–33.3 mph). 3 of 2,800 checked values (0.1%) were excluded by quality control. Across 9 comparable years, mean wave height was above the same-month mean of 11.7 ft and mean wave period was above the same-month mean of 8 seconds.

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

Typical Wave Height

13.5ft
Mean: 14.2 ft
P10–P90: 7.5 — 20.3 ft
Recorded extremes

4.6 — 42.7 ft

Available for 697 of 700 hourly samples

Mean Wave Period

9secs
P10–P90: 7 — 11secs
Recorded extremes

6 — 14secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 700 hourly samples

Typical Wind

SW, 21.9mph
Mean: 21.9 mph
P10–P90: 9.2 — 33.3 mph
Recorded extremes

2.2 — 45 mph

Circular concentration: 47%

Compared With Previous Novembers

Historical baseline from 5,866 observations across 9 years.

Wave Height
14.2ft
2.5ft above mean
Historical mean 11.7ft
Wave Period
9s
1s above mean
Historical mean 8s
Water Temperature
–
Not enough comparable data
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 Nov 2020Last observation shown
Metric
Mean wave height (ft)181513161618151066121018157109141615QC rejected231518141018151211
Mean observed period(s)9Reported9Reported8Reported9Reported9Reported10Reported11Reported9Reported8Reported8Reported8Reported8Reported9Reported9Reported8Reported8Reported8Reported8Reported9Reported9Reported11Reported10Reported9Reported10Reported10Reported8Reported11Reported10Reported8Reported8Reported
Mean wave power(kW/m)------------------------------
Mean wind directionSSWconcentration 90%Wconcentration 98%Wconcentration 91%Wconcentration 88%WSWconcentration 99%WSWconcentration 96%Variableconcentration 23%SEconcentration 88%Sconcentration 96%SSEconcentration 99%Sconcentration 72%SSWconcentration 90%SSWconcentration 96%SSWconcentration 88%SSEconcentration 67%Wconcentration 98%Nconcentration 42%NEconcentration 92%NNWconcentration 89%Sconcentration 84%Wconcentration 98%Wconcentration 98%SWconcentration 92%SWconcentration 94%NWconcentration 47%SWconcentration 79%SWconcentration 49%SSWconcentration 90%SWconcentration 96%NNWconcentration 81%
Mean wind speed (mph)34262728302391411172322282111251234232841282421151712152220
Mean water temperature(°C)------------------------------

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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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