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K4 wave buoy daily means for Jul 2017

Daily means from the K4 wave buoy for Jul 2017, 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

713 wave-buoy observations covered all 31 days. Typical wave height was 6.6 ft (10th–90th percentile 3.6–11.2 ft), while mean reported wave period; measurement type unavailable was 6 seconds (10th–90th percentile 5–7 seconds). Typical wind was 15 mph (10th–90th percentile 3.4–24.2 mph) and mean water temperature was 14.1°C (10th–90th percentile 13.5–14.7°C). 32 of 3,565 checked values (0.9%) were excluded by quality control. Across 6 comparable years, mean wave height was above the same-month mean of 6.6 ft and mean wave period was the same as the same-month mean of 6 seconds.

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

Typical Wave Height

6.6ft
Mean: 6.8 ft
P10–P90: 3.6 — 11.2 ft
Recorded extremes

0 — 17.7 ft

Available for 703 of 713 hourly samples

Mean Wave Period

6secs
P10–P90: 5 — 7secs
Recorded extremes

4 — 9secs

Available for 702 of 713 hourly samples

Mean Water Temperature

14.1°C
P10–P90: 13.5 — 14.7°C
Recorded extremes

13.1 — 15.1°C

Typical Wind

W, 15mph
Mean: 14.4 mph
P10–P90: 3.4 — 24.2 mph
Recorded extremes

0 — 32.2 mph

Circular concentration: 33%

Available for 702 of 713 hourly samples

Compared With Previous Julys

Historical baseline from 4,282 observations across 6 years.

Wave Height
6.8ft
0.2ft above mean
Historical mean 6.6ft
Wave Period
6s
In line with the historical mean
Historical mean 6s
Water Temperature
14.1°C
0.4°C below mean
Historical mean 14.5°C

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 2017Last observation shown
Metric
Mean wave height (ft)98643669654467710967876334111412867
Mean observed period(s)6Reported6Reported6Reported5Reported5Reported5Reported7Reported6Reported6Reported7Reported6Reported7Reported5Reported6Reported6Reported6Reported8Reported5Reported6Reported7Reported6Reported6Reported6Reported6Reported5Reported7Reported8Reported7Reported6Reported6Reported6Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionWNWconcentration 86%Wconcentration 80%NNWconcentration 37%NNEconcentration 93%SSEconcentration 77%SWconcentration 76%WNWconcentration 82%WSWconcentration 92%NWconcentration 81%Variableconcentration 16%NEconcentration 88%SEconcentration 33%Wconcentration 74%SWconcentration 71%WSWconcentration 83%Wconcentration 79%SWconcentration 73%SEconcentration 58%WSWconcentration 50%WSWconcentration 65%NNEconcentration 93%Nconcentration 71%Nconcentration 85%Variableconcentration 0%SEconcentration 98%WSWconcentration 76%WSWconcentration 84%Wconcentration 69%WSWconcentration 98%WNWconcentration 91%NWconcentration 84%
Mean wind speed (mph)19168101118102194128161818171213191319118815272619191610
Mean water temperature(°C)13.213.213.513.513.713.613.613.613.613.813.914.114.114.014.114.014.314.414.414.314.314.514.814.914.814.614.414.314.214.214.2

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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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