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K4 wave buoy daily means for Sep 2013

Daily means from the K4 wave buoy for Sep 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

716 wave-buoy observations covered all 30 days. Typical wave height was 8.5 ft (10th–90th percentile 4.9–14.4 ft), while mean reported wave period; measurement type unavailable was 6.7 seconds (10th–90th percentile 5–8 seconds). Typical wind was 17.2 mph (10th–90th percentile 9.2–27.7 mph) and mean water temperature was 13.8°C (10th–90th percentile 13.3–14.4°C). All 3,580 checked values passed quality control. Across 3 comparable years, mean wave height was below the same-month mean of 10.5 ft and mean wave period was below the same-month mean of 7.2 seconds.

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

Typical Wave Height

8.5ft
Mean: 9.7 ft
P10–P90: 4.9 — 14.4 ft
Recorded extremes

3.9 — 27.9 ft

Mean Wave Period

6.7secs
P10–P90: 5 — 8secs
Recorded extremes

5 — 11secs

Mean Water Temperature

13.8°C
P10–P90: 13.3 — 14.4°C
Recorded extremes

13.2 — 14.7°C

Typical Wind

Variable, 17.2mph
Mean: 17.7 mph
P10–P90: 9.2 — 27.7 mph
Recorded extremes

2.2 — 42.5 mph

Circular concentration: 25%

Compared With Previous Septembers

Historical baseline from 2,070 observations across 3 years.

Wave Height
9.7ft
0.8ft below mean
Historical mean 10.5ft
Wave Period
6.7s
0.5s below mean
Historical mean 7.2s
Water Temperature
13.8°C
In line with the historical mean
Historical mean 13.8°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 Sep 2013Last observation shown
Metric
Mean wave height (ft)1411111088758567109202516131491212118665666
Mean observed period(s)8Reported7Reported6Reported7Reported6Reported6Reported6Reported6Reported6Reported5Reported6Reported5Reported8Reported8Reported8Reported10Reported9Reported7Reported7Reported6Reported8Reported7Reported7Reported7Reported7Reported7Reported6Reported8Reported5Reported5Reported
Mean wave power(kW/m)------------------------------
Mean wind directionWSWconcentration 98%SWconcentration 98%SSWconcentration 99%WSWconcentration 83%WNWconcentration 87%Nconcentration 98%NNWconcentration 96%Sconcentration 52%NNWconcentration 96%Wconcentration 91%Wconcentration 76%Wconcentration 72%Wconcentration 90%WSWconcentration 76%Wconcentration 92%WNWconcentration 98%NWconcentration 58%WNWconcentration 71%Wconcentration 83%SWconcentration 98%SSWconcentration 95%Sconcentration 97%SEconcentration 93%Econcentration 95%ENEconcentration 97%ESEconcentration 88%SSEconcentration 86%ENEconcentration 80%ESEconcentration 94%ESEconcentration 100%
Mean wind speed (mph)26232518142216112112131710163532152026171920181110910101718
Mean water temperature(°C)14.614.614.514.414.314.314.214.214.114.114.114.114.014.113.913.613.513.413.313.313.213.313.313.513.513.513.513.613.413.4

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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