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K4 wave buoy daily means for Dec 2010

Daily means from the K4 wave buoy for Dec 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

741 wave-buoy observations covered all 31 days. Typical wave height was 8.2 ft (10th–90th percentile 5.2–15.4 ft), while mean reported wave period; measurement type unavailable was 7 seconds (10th–90th percentile 5–9 seconds). Typical wind was 15 mph (10th–90th percentile 5.8–25.3 mph) and mean water temperature was 11°C. 3 of 3,695 checked values (0.1%) were excluded by quality control.

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

Typical Wave Height

8.2ft
Mean: 9.4 ft
P10–P90: 5.2 — 15.4 ft
Recorded extremes

3.6 — 27.6 ft

Available for 739 of 741 hourly samples

Mean Wave Period

7secs
P10–P90: 5 — 9secs
Recorded extremes

4 — 10secs

Mean Water Temperature

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

11 — 11°C

Available for 736 of 741 hourly samples

Typical Wind

Variable, 15mph
Mean: 15.3 mph
P10–P90: 5.8 — 25.3 mph
Recorded extremes

0 — 38.1 mph

Circular concentration: 16%

Available for 740 of 741 hourly samples

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 Dec 2010Last observation shown
Metric
Mean wave height (ft)448981010779981086132314127786611231511966
Mean observed period(s)5Reported5Reported6Reported6Reported7Reported7Reported8Reported7Reported6Reported7Reported8Reported6Reported7Reported7Reported7Reported7Reported10Reported9Reported7Reported7Reported7Reported8Reported8Reported5Reported6Reported9Reported9Reported7Reported7Reported6Reported7Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionEconcentration 65%SSWconcentration 67%NWconcentration 91%NNEconcentration 94%NWconcentration 70%Nconcentration 77%NNEconcentration 96%NNWconcentration 95%WNWconcentration 100%WNWconcentration 99%ENEconcentration 64%ESEconcentration 96%SEconcentration 99%ESEconcentration 93%Wconcentration 76%NNWconcentration 87%NNWconcentration 99%NEconcentration 36%Econcentration 93%NEconcentration 58%NNEconcentration 80%NNEconcentration 94%SEconcentration 77%SSWconcentration 98%Sconcentration 98%Sconcentration 100%SEconcentration 85%SSEconcentration 93%NNEconcentration 68%ESEconcentration 95%SSEconcentration 66%
Mean wind speed (mph)11121516142016121618920187102726142161099162632151715114
Mean water temperature(°C)11.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.0

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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