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K4 wave buoy daily means for Jun 2012

Daily means from the K4 wave buoy for Jun 2012, 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

720 wave-buoy observations covered all 30 days. Typical wave height was 5.9 ft (10th–90th percentile 3.6–10.8 ft), while mean reported wave period; measurement type unavailable was 5.8 seconds (10th–90th percentile 5–7 seconds). Typical wind was 15 mph (10th–90th percentile 5.8–25.3 mph) and mean water temperature was 12.7°C (10th–90th percentile 12–13.5°C). 2 of 3,600 checked values (0.1%) were excluded by quality control. Across 2 comparable years, mean wave height was below the same-month mean of 6.9 ft and mean wave period was below the same-month mean of 6.4 seconds.

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

Typical Wave Height

5.9ft
Mean: 6.7 ft
P10–P90: 3.6 — 10.8 ft
Recorded extremes

3 — 16.7 ft

Available for 718 of 720 hourly samples

Mean Wave Period

5.8secs
P10–P90: 5 — 7secs
Recorded extremes

4 — 8secs

Mean Water Temperature

12.7°C
P10–P90: 12 — 13.5°C
Recorded extremes

11.8 — 14°C

Typical Wind

NE, 15mph
Mean: 15.5 mph
P10–P90: 5.8 — 25.3 mph
Recorded extremes

2.3 — 38 mph

Circular concentration: 40%

Compared With Previous Junes

Historical baseline from 1,404 observations across 2 years.

Wave Height
6.7ft
0.2ft below mean
Historical mean 6.9ft
Wave Period
5.8s
0.6s below mean
Historical mean 6.4s
Water Temperature
12.7°C
1°C above mean
Historical mean 11.7°C

Chart showing grouped wave observations for K4. 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 K4 wave buoy

K4 (WMO 62105) is a UK Met Office buoy in the North Atlantic northwest of Ireland. Its remote position samples weather and sea conditions moving towards northern UK and Irish waters. The international station feed can include wind, pressure, temperature and wave observations, although the reported parameters vary with sensor availability.

Metrics are rows; days run left to right.
K4 wave buoy daily means Jun 2012Last observation shown
Metric
Mean wave height (ft)710968778756656QC rejected10534544555644QC rejectedQC rejected
Mean observed period(s)6Reported6Reported6Reported5Reported6Reported7Reported6Reported6Reported7Reported6Reported5Reported6Reported6Reported5Reported7Reported7Reported6Reported5Reported5Reported5Reported5Reported4Reported6Reported6Reported6Reported6Reported6Reported5Reported7Reported7Reported
Mean wave power(kW/m)------------------------------
Mean wind directionEconcentration 93%ENEconcentration 98%ENEconcentration 99%Econcentration 94%SEconcentration 76%NWconcentration 40%Nconcentration 94%NWconcentration 97%NWconcentration 95%NNEconcentration 81%Nconcentration 97%Nconcentration 100%NEconcentration 91%ENEconcentration 99%NEconcentration 97%Nconcentration 98%SWconcentration 34%Econcentration 89%Econcentration 97%SEconcentration 96%NEconcentration 64%WNWconcentration 95%WSWconcentration 71%Nconcentration 95%ENEconcentration 82%Sconcentration 65%Sconcentration 83%NEconcentration 50%NNWconcentration 97%NWconcentration 98%
Mean wind speed (mph)17262017154212391017141222312161314179157913159102526
Mean water temperature(°C)12.412.112.011.912.112.312.212.012.412.812.712.612.812.712.412.212.412.412.612.712.712.813.213.613.613.213.413.613.312.7

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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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