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K4 wave buoy daily means for Jul 2011

Daily means from the K4 wave buoy for Jul 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

733 wave-buoy observations covered all 31 days. Typical wave height was 6.2 ft (10th–90th percentile 3.6–10.2 ft), while mean reported wave period; measurement type unavailable was 6.3 seconds (10th–90th percentile 5–7.8 seconds). Typical wind was 13.9 mph (10th–90th percentile 5.8–25.3 mph) and mean water temperature was 13.6°C (10th–90th percentile 12.9–14.6°C). 1 of 3,665 checked values (0%) were excluded by quality control. Across 1 comparable year, mean wave height was below the same-month mean of 8 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

6.2ft
Mean: 6.6 ft
P10–P90: 3.6 — 10.2 ft
Recorded extremes

2.6 — 21.3 ft

Available for 732 of 733 hourly samples

Mean Wave Period

6.3secs
P10–P90: 5 — 7.8secs
Recorded extremes

4 — 10secs

Mean Water Temperature

13.6°C
P10–P90: 12.9 — 14.6°C
Recorded extremes

12.4 — 15.5°C

Typical Wind

Variable, 13.9mph
Mean: 14.8 mph
P10–P90: 5.8 — 25.3 mph
Recorded extremes

2.2 — 38.1 mph

Circular concentration: 13%

Compared With Previous Julys

Historical baseline from 727 observations across 1 year.

Wave Height
6.6ft
1.4ft below mean
Historical mean 8ft
Wave Period
6.3s
0.1s below mean
Historical mean 6.4s
Water Temperature
13.6°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 Jul 2011Last observation shown
Metric
Mean wave height (ft)7976876644445781216129654436658657
Mean observed period(s)6Reported6Reported6Reported6Reported6Reported7Reported6Reported6Reported5Reported5Reported6Reported7Reported7Reported7Reported6Reported7Reported7Reported7Reported7Reported7Reported7Reported6Reported6Reported6Reported7Reported7Reported5Reported8Reported7Reported5Reported6Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionSconcentration 99%Sconcentration 99%Sconcentration 97%SEconcentration 90%SSEconcentration 92%NNEconcentration 51%NNEconcentration 80%Nconcentration 98%NWconcentration 97%NNWconcentration 98%WNWconcentration 50%ESEconcentration 47%Sconcentration 97%WSWconcentration 90%SWconcentration 79%NWconcentration 91%NWconcentration 98%NNWconcentration 98%NNWconcentration 95%Nconcentration 96%Nconcentration 92%SEconcentration 38%SEconcentration 66%Econcentration 46%NNWconcentration 85%Sconcentration 32%Wconcentration 55%NWconcentration 96%Variableconcentration 27%SEconcentration 96%WSWconcentration 79%
Mean wind speed (mph)202315171912161413136513132129312612111081391410141251919
Mean water temperature(°C)12.912.712.813.013.013.113.213.513.814.014.214.914.914.714.514.113.312.812.913.013.313.613.513.613.613.713.813.914.114.014.0

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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