Skip to content
Surfhog home
Menu

K4 wave buoy daily means for Jan 2011

Daily means from the K4 wave buoy for Jan 2011, 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 10.2 ft (10th–90th percentile 6.6–17.4 ft), while mean reported wave period; measurement type unavailable was 7.9 seconds (10th–90th percentile 6–9 seconds). Typical wind was 17.2 mph (10th–90th percentile 6.9–27.8 mph) and mean water temperature was 11°C. 2 of 3,705 checked values (0.1%) were excluded by quality control.

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

Typical Wave Height

10.2ft
Mean: 11.2 ft
P10–P90: 6.6 — 17.4 ft
Recorded extremes

4.9 — 22.6 ft

Available for 739 of 741 hourly samples

Mean Wave Period

7.9secs
P10–P90: 6 — 9secs
Recorded extremes

5 — 12secs

Mean Water Temperature

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

10 — 11°C

Typical Wind

WSW, 17.2mph
Mean: 17.2 mph
P10–P90: 6.9 — 27.8 mph
Recorded extremes

2.2 — 39.2 mph

Circular concentration: 51%

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 Jan 2011Last observation shown
Metric
Mean wave height (ft)89711181514151189111216201913101314107669987710QC rejected
Mean observed period(s)9Reported9Reported7Reported7Reported9Reported8Reported10Reported8Reported7Reported7Reported8Reported7Reported8Reported8Reported9Reported9Reported8Reported7Reported8Reported9Reported8Reported8Reported9Reported6Reported6Reported6Reported8Reported8Reported7Reported7Reported8Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionENEconcentration 32%ESEconcentration 58%WSWconcentration 95%WNWconcentration 94%NNWconcentration 85%NNEconcentration 88%WSWconcentration 74%WNWconcentration 86%Wconcentration 84%Nconcentration 56%SSWconcentration 39%SSWconcentration 92%SSWconcentration 96%SWconcentration 86%SSWconcentration 98%WSWconcentration 91%Wconcentration 97%WSWconcentration 84%Sconcentration 99%SSWconcentration 97%SSWconcentration 94%Sconcentration 93%WSWconcentration 71%WNWconcentration 97%WNWconcentration 98%WNWconcentration 96%SSWconcentration 83%SSWconcentration 87%Variableconcentration 13%SWconcentration 90%SWconcentration 92%
Mean wind speed (mph)8619242116122617111718172629261817231912761723181111131828
Mean water temperature(°C)11.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.011.010.911.011.011.011.011.011.011.010.911.011.011.011.0

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.

› Wave Buoy List