Skip to content
Surfhog home
Menu

K4 wave buoy daily means for Jan 2013

Daily means from the K4 wave buoy for Jan 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

713 wave-buoy observations covered all 31 days. Typical wave height was 13.8 ft (10th–90th percentile 8.9–24 ft), while mean reported wave period; measurement type unavailable was 8.2 seconds (10th–90th percentile 7–10 seconds). Typical wind was 23 mph (10th–90th percentile 11.4–34.5 mph) and mean water temperature was 10.8°C (10th–90th percentile 10.5–10.9°C). 5 of 3,565 checked values (0.1%) were excluded by quality control. Across 2 comparable years, mean wave height was above the same-month mean of 13.3 ft and mean wave period was above the same-month mean of 8 seconds.

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

Typical Wave Height

13.8ft
Mean: 15.3 ft
P10–P90: 8.9 — 24 ft
Recorded extremes

6.9 — 39 ft

Available for 710 of 713 hourly samples

Mean Wave Period

8.2secs
P10–P90: 7 — 10secs
Recorded extremes

5 — 14secs

Mean Water Temperature

10.8°C
P10–P90: 10.5 — 10.9°C
Recorded extremes

10.4 — 11.2°C

Typical Wind

SW, 23mph
Mean: 23 mph
P10–P90: 11.4 — 34.5 mph
Recorded extremes

2.3 — 55.2 mph

Circular concentration: 41%

Available for 711 of 713 hourly samples

Compared With Previous Januarys

Historical baseline from 1,484 observations across 2 years.

Wave Height
15.3ft
2ft above mean
Historical mean 13.3ft
Wave Period
8.2s
0.2s above mean
Historical mean 8s
Water Temperature
10.8°C
In line with the historical mean
Historical mean 10.8°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 Jan 2013Last observation shown
Metric
Mean wave height (ft)16131317QC rejected1211121418131191298111312152418111215163129241721
Mean observed period(s)8Reported7Reported8Reported8Reported9Reported8Reported8Reported8Reported8Reported9Reported8Reported8Reported6Reported7Reported7Reported6Reported6Reported8Reported8Reported8Reported11Reported11Reported8Reported7Reported9Reported8Reported11Reported11Reported10Reported9Reported9Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionWconcentration 78%SWconcentration 99%SSWconcentration 96%Sconcentration 98%SSWconcentration 87%Sconcentration 56%SSEconcentration 77%WSWconcentration 86%Sconcentration 98%Sconcentration 35%SSEconcentration 88%Econcentration 55%WNWconcentration 95%NWconcentration 96%Sconcentration 77%WNWconcentration 86%Sconcentration 86%NWconcentration 96%NWconcentration 44%SSEconcentration 95%WNWconcentration 59%NNEconcentration 82%SEconcentration 96%SSEconcentration 83%NWconcentration 41%SSWconcentration 83%WSWconcentration 96%WSWconcentration 86%SWconcentration 76%SWconcentration 58%Wconcentration 96%
Mean wind speed (mph)2326232822171921252818923221614252215261312172424283735352235
Mean water temperature(°C)10.710.810.910.810.810.910.810.810.710.810.810.810.710.710.610.510.610.510.710.610.510.611.011.010.610.610.711.011.010.910.9

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.

› Wave Buoy List