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K4 wave buoy daily means for Mar 2011

Daily means from the K4 wave buoy for Mar 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

742 wave-buoy observations covered all 31 days. Typical wave height was 9.8 ft (10th–90th percentile 4.9–18.7 ft), while mean reported wave period; measurement type unavailable was 8 seconds (10th–90th percentile 7–9 seconds). Typical wind was 15 mph (10th–90th percentile 5.8–30 mph) and mean water temperature was 10.6°C (10th–90th percentile 10–11°C). 4 of 3,710 checked values (0.1%) were excluded by quality control. Across 1 comparable year, mean wave height was above the same-month mean of 10 ft and mean wave period was above the same-month mean of 6.9 seconds.

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

Typical Wave Height

9.8ft
Mean: 10.9 ft
P10–P90: 4.9 — 18.7 ft
Recorded extremes

3.9 — 30.2 ft

Available for 739 of 742 hourly samples

Mean Wave Period

8secs
P10–P90: 7 — 9secs
Recorded extremes

5 — 12secs

Mean Water Temperature

10.6°C
P10–P90: 10 — 11°C
Recorded extremes

10 — 11°C

Available for 741 of 742 hourly samples

Typical Wind

Variable, 15mph
Mean: 16.6 mph
P10–P90: 5.8 — 30 mph
Recorded extremes

2.2 — 40.3 mph

Circular concentration: 26%

Compared With Previous Marchs

Historical baseline from 717 observations across 1 year.

Wave Height
10.9ft
0.9ft above mean
Historical mean 10ft
Wave Period
8s
1.1s above mean
Historical mean 6.9s
Water Temperature
10.6°C
Not enough comparable data

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 Mar 2011Last observation shown
Metric
Mean wave height (ft)1415106651019242317141712915161191112875556678QC rejected
Mean observed period(s)10Reported9Reported8Reported7Reported8Reported6Reported8Reported9Reported10Reported9Reported9Reported9Reported8Reported7Reported8Reported8Reported9Reported7Reported7Reported7Reported7Reported7Reported8Reported7Reported8Reported9Reported9Reported10Reported7Reported6Reported8Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionSSWconcentration 79%Variableconcentration 17%NNEconcentration 69%Nconcentration 83%ESEconcentration 47%SWconcentration 96%SWconcentration 98%Wconcentration 94%Wconcentration 96%Wconcentration 99%Wconcentration 94%NEconcentration 96%NNEconcentration 98%NEconcentration 86%SWconcentration 72%SSWconcentration 79%WSWconcentration 91%WSWconcentration 85%SSWconcentration 93%SWconcentration 96%SWconcentration 99%SWconcentration 91%SSWconcentration 96%SEconcentration 79%NEconcentration 97%NNEconcentration 93%NNEconcentration 86%SEconcentration 85%SSEconcentration 93%SSWconcentration 78%SWconcentration 70%
Mean wind speed (mph)171910941118303232192128171327191719202388810778132021
Mean water temperature(°C)11.011.010.910.911.011.011.011.011.010.510.310.010.010.410.510.711.011.010.710.610.010.410.511.010.710.210.611.010.710.610.0

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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