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K4 wave buoy daily means for Oct 2013

Daily means from the K4 wave buoy for Oct 2013, 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

744 wave-buoy observations covered all 31 days. Typical wave height was 9.2 ft (10th–90th percentile 5.6–16.6 ft), while mean reported wave period; measurement type unavailable was 6.8 seconds (10th–90th percentile 5–8 seconds). Typical wind was 18.3 mph (10th–90th percentile 10.3–28.9 mph) and mean water temperature was 13.2°C (10th–90th percentile 12.7–13.6°C). 1 of 3,720 checked values (0%) were excluded by quality control. Across 3 comparable years, mean wave height was below the same-month mean of 11 ft and mean wave period was below the same-month mean of 7.4 seconds.

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

Typical Wave Height

9.2ft
Mean: 10.4 ft
P10–P90: 5.6 — 16.6 ft
Recorded extremes

3.6 — 36.1 ft

Available for 743 of 744 hourly samples

Mean Wave Period

6.8secs
P10–P90: 5 — 8secs
Recorded extremes

4 — 13secs

Mean Water Temperature

13.2°C
P10–P90: 12.7 — 13.6°C
Recorded extremes

12.5 — 13.8°C

Typical Wind

Variable, 18.3mph
Mean: 19 mph
P10–P90: 10.3 — 28.9 mph
Recorded extremes

3.4 — 38 mph

Circular concentration: 20%

Compared With Previous Octobers

Historical baseline from 2,124 observations across 3 years.

Wave Height
10.4ft
0.6ft below mean
Historical mean 11ft
Wave Period
6.8s
0.6s below mean
Historical mean 7.4s
Water Temperature
13.2°C
0.5°C above mean
Historical mean 12.7°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 2013Last observation shown
Metric
Mean wave height (ft)7765711129101077559109108781010910122817151527
Mean observed period(s)6Reported6Reported6Reported5Reported6Reported7Reported7Reported7Reported7Reported8Reported6Reported6Reported6Reported5Reported6Reported7Reported7Reported7Reported7Reported7Reported7Reported6Reported6Reported7Reported7Reported7Reported11Reported8Reported8Reported8Reported10Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionESEconcentration 97%ESEconcentration 95%Variableconcentration 16%Wconcentration 94%SSWconcentration 97%SSWconcentration 100%SWconcentration 85%WNWconcentration 98%NNWconcentration 84%ENEconcentration 90%ESEconcentration 96%SEconcentration 95%ESEconcentration 98%ESEconcentration 98%ESEconcentration 99%Sconcentration 68%SSEconcentration 76%SEconcentration 82%SEconcentration 92%ESEconcentration 88%Econcentration 89%Nconcentration 89%WNWconcentration 96%ENEconcentration 56%Nconcentration 85%SSWconcentration 92%Wconcentration 90%NWconcentration 97%Wconcentration 73%SWconcentration 78%WSWconcentration 98%
Mean wind speed (mph)1517121519212315201117171416251813191271329201423252929212732
Mean water temperature(°C)13.513.513.713.613.613.613.613.613.613.513.513.413.213.113.213.213.113.013.013.213.113.112.912.912.812.912.812.612.712.712.6

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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