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K4 wave buoy daily means for Oct 2019

Daily means from the K4 wave buoy for Oct 2019, 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 11.5 ft (10th–90th percentile 6.6–20.3 ft), while mean reported wave period; measurement type unavailable was 7.6 seconds (10th–90th percentile 6–10 seconds). Typical wind was 20.8 mph (10th–90th percentile 9.2–31 mph) and mean water temperature was 12.5°C (10th–90th percentile 12.1–13.2°C). 3 of 3,710 checked values (0.1%) were excluded by quality control. Across 8 comparable years, mean wave height was above the same-month mean of 11.1 ft and mean wave period was above the same-month mean of 7.2 seconds.

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

Typical Wave Height

11.5ft
Mean: 12.6 ft
P10–P90: 6.6 — 20.3 ft
Recorded extremes

3.9 — 33.8 ft

Available for 739 of 742 hourly samples

Mean Wave Period

7.6secs
P10–P90: 6 — 10secs
Recorded extremes

5 — 14secs

Mean Water Temperature

12.5°C
P10–P90: 12.1 — 13.2°C
Recorded extremes

11.7 — 13.6°C

Typical Wind

Variable, 20.8mph
Mean: 20 mph
P10–P90: 9.2 — 31 mph
Recorded extremes

2.2 — 47.2 mph

Circular concentration: 21%

Compared With Previous Octobers

Historical baseline from 5,763 observations across 8 years.

Wave Height
12.6ft
1.5ft above mean
Historical mean 11.1ft
Wave Period
7.6s
0.4s above mean
Historical mean 7.2s
Water Temperature
12.5°C
0.5°C below mean
Historical mean 13°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 Oct 2019Last observation shown
Metric
Mean wave height (ft)1081718131226231914158651014159109713161815171288108
Mean observed period(s)7Reported8Reported8Reported9Reported8Reported8Reported10Reported10Reported9Reported8Reported8Reported7Reported7Reported6Reported7Reported8Reported8Reported6Reported7Reported7Reported6Reported7Reported8Reported9Reported9Reported10Reported8Reported7Reported6Reported6Reported6Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionNNEconcentration 97%ESEconcentration 77%SEconcentration 62%Variableconcentration 10%SSWconcentration 74%SSWconcentration 62%SWconcentration 98%WSWconcentration 96%Wconcentration 100%SWconcentration 85%Wconcentration 94%SWconcentration 87%Sconcentration 58%WSWconcentration 80%SSWconcentration 74%SSWconcentration 89%SSEconcentration 89%NNEconcentration 91%Nconcentration 100%Nconcentration 96%SWconcentration 85%SSWconcentration 98%SWconcentration 93%NWconcentration 88%WNWconcentration 97%WNWconcentration 98%NNWconcentration 89%NEconcentration 95%Econcentration 98%Econcentration 99%ESEconcentration 94%
Mean wind speed (mph)201333151719323226232391092023221922161826211913191715232619
Mean water temperature(°C)13.613.513.413.013.012.912.912.512.012.212.312.512.512.512.412.312.312.312.112.112.112.212.412.412.512.312.212.212.112.512.6

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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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