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K4 wave buoy daily means for May 2010

Daily means from the K4 wave buoy for May 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

693 wave-buoy observations covered 30 of 31 days (97%). Typical wave height was 6.6 ft (10th–90th percentile 3.9–10.4 ft), while mean reported wave period; measurement type unavailable was 6.7 seconds (10th–90th percentile 5–8 seconds). Typical wind was 15 mph (10th–90th percentile 5.8–22 mph). All 2,772 checked values passed quality control.

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

Typical Wave Height

6.6ft
Mean: 6.8 ft
P10–P90: 3.9 — 10.4 ft
Recorded extremes

2 — 15.4 ft

Mean Wave Period

6.7secs
P10–P90: 5 — 8secs
Recorded extremes

4 — 13secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 693 hourly samples

Typical Wind

Variable, 15mph
Mean: 14.4 mph
P10–P90: 5.8 — 22 mph
Recorded extremes

2.2 — 33.4 mph

Circular concentration: 26%

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 May 2010Last observation shown
Metric
Mean wave height (ft)QC rejected865677-QC rejected787911118677665324697567
Mean observed period(s)7Reported6Reported7Reported7Reported6Reported6Reported6Reported-6Reported6Reported6Reported6Reported7Reported7Reported7Reported6Reported6Reported6Reported7Reported9Reported9Reported8Reported7Reported5Reported5Reported7Reported8Reported8Reported7Reported6Reported7Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionNconcentration 82%Nconcentration 98%Nconcentration 92%WNWconcentration 91%NNWconcentration 98%NNEconcentration 91%NEconcentration 100%-NNEconcentration 92%NNEconcentration 94%NNWconcentration 38%Variableconcentration 30%NWconcentration 98%WNWconcentration 95%Wconcentration 83%WNWconcentration 92%SSWconcentration 87%SSWconcentration 88%Sconcentration 81%SSWconcentration 72%Sconcentration 89%Sconcentration 84%NNWconcentration 47%NNEconcentration 91%NEconcentration 96%Nconcentration 87%NNWconcentration 95%WSWconcentration 50%NEconcentration 69%ENEconcentration 60%SSEconcentration 81%
Mean wind speed (mph)26211314192021-1319191720222317151712106661012912581112
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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