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K4 wave buoy daily means for Sep 2019

Daily means from the K4 wave buoy for Sep 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

718 wave-buoy observations covered all 30 days. Typical wave height was 9.8 ft (10th–90th percentile 5.9–13.8 ft), while mean reported wave period; measurement type unavailable was 7 seconds (10th–90th percentile 6–8.3 seconds). Typical wind was 16.1 mph (10th–90th percentile 8.1–26.4 mph) and mean water temperature was 14°C (10th–90th percentile 13.8–14.2°C). All 3,590 checked values passed quality control. Across 8 comparable years, mean wave height was below the same-month mean of 9.8 ft and mean wave period was above the same-month mean of 6.9 seconds.

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

Typical Wave Height

9.8ft
Mean: 9.7 ft
P10–P90: 5.9 — 13.8 ft
Recorded extremes

3.9 — 18 ft

Mean Wave Period

7secs
P10–P90: 6 — 8.3secs
Recorded extremes

5 — 10secs

Mean Water Temperature

14°C
P10–P90: 13.8 — 14.2°C
Recorded extremes

13.5 — 14.4°C

Typical Wind

WSW, 16.1mph
Mean: 16.9 mph
P10–P90: 8.1 — 26.4 mph
Recorded extremes

2.2 — 32.2 mph

Circular concentration: 45%

Compared With Previous Septembers

Historical baseline from 5,432 observations across 8 years.

Wave Height
9.7ft
0.1ft below mean
Historical mean 9.8ft
Wave Period
7s
0.1s above mean
Historical mean 6.9s
Water Temperature
14°C
In line with the historical mean
Historical mean 14°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 2019Last observation shown
Metric
Mean wave height (ft)910915121488111213101013128755811881291212968
Mean observed period(s)7Reported7Reported7Reported8Reported7Reported8Reported7Reported6Reported8Reported7Reported7Reported8Reported7Reported7Reported8Reported8Reported7Reported6Reported5Reported6Reported6Reported7Reported6Reported8Reported8Reported8Reported8Reported7Reported7Reported7Reported
Mean wave power(kW/m)------------------------------
Mean wind directionWconcentration 92%WSWconcentration 99%WSWconcentration 95%NWconcentration 92%Wconcentration 96%WNWconcentration 97%SWconcentration 68%SWconcentration 70%WNWconcentration 93%SSWconcentration 94%Wconcentration 98%Wconcentration 95%SWconcentration 84%SWconcentration 85%WNWconcentration 89%WNWconcentration 98%SWconcentration 93%SSWconcentration 96%Sconcentration 99%SEconcentration 98%SEconcentration 97%SSWconcentration 61%SEconcentration 91%Econcentration 86%SWconcentration 77%WSWconcentration 94%Wconcentration 97%NEconcentration 56%Nconcentration 89%ENEconcentration 96%
Mean wind speed (mph)1722202524211120172423181725791111162223919139171891119
Mean water temperature(°C)14.214.214.314.214.214.113.813.813.913.913.913.913.613.713.814.013.914.014.114.114.014.114.013.913.913.913.913.913.913.8

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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