Skip to content
Surfhog home
Menu

K4 wave buoy daily means for Dec 2013

Daily means from the K4 wave buoy for Dec 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

739 wave-buoy observations covered all 31 days. Typical wave height was 19.7 ft (10th–90th percentile 11.8–28.5 ft), while mean reported wave period; measurement type unavailable was 8.8 seconds (10th–90th percentile 7–10 seconds). Typical wind was 27.7 mph (10th–90th percentile 18.3–39.1 mph) and mean water temperature was 11.1°C (10th–90th percentile 10.8–11.4°C). 7 of 3,695 checked values (0.2%) were excluded by quality control. Across 3 comparable years, mean wave height was above the same-month mean of 14 ft and mean wave period was above the same-month mean of 7.9 seconds.

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

Typical Wave Height

19.7ft
Mean: 20 ft
P10–P90: 11.8 — 28.5 ft
Recorded extremes

7.5 — 44.3 ft

Available for 732 of 739 hourly samples

Mean Wave Period

8.8secs
P10–P90: 7 — 10secs
Recorded extremes

6 — 13secs

Mean Water Temperature

11.1°C
P10–P90: 10.8 — 11.4°C
Recorded extremes

10.5 — 11.5°C

Typical Wind

WSW, 27.7mph
Mean: 28.2 mph
P10–P90: 18.3 — 39.1 mph
Recorded extremes

5.8 — 55.3 mph

Circular concentration: 67%

Compared With Previous Decembers

Historical baseline from 2,213 observations across 3 years.

Wave Height
20ft
6ft above mean
Historical mean 14ft
Wave Period
8.8s
0.9s above mean
Historical mean 7.9s
Water Temperature
11.1°C
0.2°C above mean
Historical mean 10.9°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 Dec 2013Last observation shown
Metric
Mean wave height (ft)111091525171414171918151825272224252728QC rejected26212723172118162122
Mean observed period(s)8Reported6Reported6Reported8Reported10Reported9Reported8Reported7Reported7Reported8Reported8Reported8Reported8Reported10Reported10Reported9Reported9Reported9Reported10Reported10Reported11Reported10Reported9Reported10Reported10Reported8Reported9Reported9Reported8Reported9Reported10Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionSSWconcentration 79%SSWconcentration 98%NWconcentration 61%Wconcentration 96%WNWconcentration 93%Wconcentration 99%SWconcentration 99%SWconcentration 99%SSWconcentration 96%Sconcentration 100%Sconcentration 92%SEconcentration 34%SWconcentration 88%SWconcentration 76%SWconcentration 90%WSWconcentration 97%SSWconcentration 92%SWconcentration 66%Wconcentration 98%SWconcentration 90%WSWconcentration 98%Wconcentration 98%SSWconcentration 62%Wconcentration 96%Wconcentration 94%SSWconcentration 45%NWconcentration 98%WNWconcentration 96%SWconcentration 81%SWconcentration 76%SSWconcentration 90%
Mean wind speed (mph)12241928292223283333322027323329363435353732283526222825282821
Mean water temperature(°C)11.411.411.411.311.311.211.211.211.211.311.211.211.111.111.111.111.111.011.011.311.311.211.010.910.910.910.810.810.810.810.6

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.

› Wave Buoy List