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K7 wave buoy daily means for Sep 2022

Daily means from the K7 wave buoy for Sep 2022, 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

719 wave-buoy observations covered all 30 days. Typical wave height was 0 ft; wave-period data were unavailable. Typical wind was 19.7 mph (10th–90th percentile 9.2–28.9 mph) and mean water temperature was 12.9°C (10th–90th percentile 12.1–13.5°C). 1,435 of 3,595 checked values (39.9%) were excluded by quality control. Across 9 comparable years, mean wave height was below the same-month mean of 8.4 ft.

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

Typical Wave Height

0ft
Mean: 0 ft
P10–P90: 0 — 0 ft
Recorded extremes

0 — 0 ft

Available for 361 of 719 hourly samples

Mean Wave Period

-secs
P10–P90: - — -secs

Available for 0 of 719 hourly samples

Mean Water Temperature

12.9°C
P10–P90: 12.1 — 13.5°C
Recorded extremes

11.2 — 14.1°C

Available for 361 of 719 hourly samples

Typical Wind

Variable, 19.7mph
Mean: 19.3 mph
P10–P90: 9.2 — 28.9 mph
Recorded extremes

0 — 48.3 mph

Circular concentration: 3%

Compared With Previous Septembers

Historical baseline from 6,155 observations across 9 years.

Wave Height
0ft
8.4ft below mean
Historical mean 8.4ft
Wave Period
–
Not enough comparable data
Historical mean 7.4s
Water Temperature
12.9°C
0.7°C above mean
Historical mean 12.2°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 Sep 2022Last observation shown
Metric
Mean wave height (ft)0000000000000000--00000000--00
Mean observed period(s)------------------------------
Mean wave power(kW/m)------------------------------
Mean wind directionSconcentration 95%SEconcentration 91%Econcentration 100%Econcentration 100%Econcentration 98%ESEconcentration 98%Econcentration 98%Econcentration 98%ENEconcentration 98%ESEconcentration 82%Sconcentration 98%WNWconcentration 87%WNWconcentration 94%NWconcentration 92%Nconcentration 98%NNWconcentration 96%NNWconcentration 96%NNEconcentration 98%SSEconcentration 42%SSWconcentration 94%SSWconcentration 99%WSWconcentration 91%Wconcentration 96%WNWconcentration 94%WSWconcentration 92%NWconcentration 99%Nconcentration 91%Nconcentration 89%WSWconcentration 73%Sconcentration 90%
Mean wind speed (mph)10162221252123201681917192224261511101624191415313524111134
Mean water temperature(°C)12.613.313.313.113.113.313.313.413.313.713.513.613.513.513.213.1--12.812.712.612.612.612.512.312.1--11.911.7

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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