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K5 wave buoy daily means for Apr 2018

Daily means from the K5 wave buoy for Apr 2018, 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

698 wave-buoy observations covered all 30 days. Typical wave height was 9.5 ft (10th–90th percentile 6.6–14.4 ft), while mean reported wave period; measurement type unavailable was 7.1 seconds (10th–90th percentile 6–9 seconds). Typical wind was 17.2 mph (10th–90th percentile 6.9–28.9 mph) and mean water temperature was 9.4°C (10th–90th percentile 9.2–9.7°C). 9 of 3,490 checked values (0.3%) were excluded by quality control. Across 8 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 7.2 seconds.

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

Typical Wave Height

9.5ft
Mean: 9.9 ft
P10–P90: 6.6 — 14.4 ft
Recorded extremes

3 — 23.3 ft

Available for 694 of 698 hourly samples

Mean Wave Period

7.1secs
P10–P90: 6 — 9secs
Recorded extremes

4 — 12secs

Available for 693 of 698 hourly samples

Mean Water Temperature

9.4°C
P10–P90: 9.2 — 9.7°C
Recorded extremes

8.8 — 10.5°C

Typical Wind

Variable, 17.2mph
Mean: 17.8 mph
P10–P90: 6.9 — 28.9 mph
Recorded extremes

2.2 — 39.1 mph

Circular concentration: 25%

Compared With Previous Aprils

Historical baseline from 5,703 observations across 8 years.

Wave Height
9.9ft
1.1ft below mean
Historical mean 11ft
Wave Period
7.1s
0.1s below mean
Historical mean 7.2s
Water Temperature
9.4°C
0.2°C below mean
Historical mean 9.6°C

Chart showing grouped wave observations for K5. 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 K5 wave buoy

K5 (WMO 64045) is a UK Met Office buoy in the far North Atlantic west of Scotland. It provides observations from a sparsely monitored ocean area upstream of the Hebrides and northern UK waters. The international feed includes marine weather and sea-temperature observations, with wave and wind parameters present only when the relevant sensors are reporting.

Metrics are rows; days run left to right.
K5 wave buoy daily means Apr 2018Last observation shown
Metric
Mean wave height (ft)69121191515109128108810121917118810889118657
Mean observed period(s)6Reported6Reported6Reported8Reported8Reported7Reported7Reported6Reported6Reported9Reported8Reported10Reported8Reported6Reported7Reported7Reported9Reported9Reported7Reported7Reported6Reported7Reported7Reported6Reported8Reported8Reported7Reported7Reported7Reported5Reported
Mean wave power(kW/m)------------------------------
Mean wind directionNNEconcentration 98%NEconcentration 98%NNEconcentration 97%NNWconcentration 57%NNEconcentration 45%ENEconcentration 96%NNEconcentration 99%NEconcentration 98%Econcentration 100%ENEconcentration 98%Econcentration 98%Econcentration 97%ESEconcentration 91%SSEconcentration 91%ESEconcentration 98%SEconcentration 92%SSEconcentration 96%SSEconcentration 97%Sconcentration 91%SWconcentration 92%Sconcentration 93%Sconcentration 46%WSWconcentration 77%WSWconcentration 93%WSWconcentration 84%WNWconcentration 48%Nconcentration 76%ESEconcentration 65%WSWconcentration 75%SSWconcentration 96%
Mean wind speed (mph)1725291311292924211711121017212728232317171114181311136725
Mean water temperature(°C)9.39.09.19.39.29.19.39.39.39.49.39.49.59.59.59.59.39.49.59.59.49.59.59.59.69.69.69.810.09.8

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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