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K5 wave buoy daily means for May 2018

Daily means from the K5 wave buoy for May 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

737 wave-buoy observations covered all 31 days. Typical wave height was 9.8 ft (10th–90th percentile 6.2–15.4 ft), while mean reported wave period; measurement type unavailable was 7.4 seconds (10th–90th percentile 6–9 seconds). Typical wind was 17.2 mph (10th–90th percentile 7.6–27.7 mph) and mean water temperature was 10°C (10th–90th percentile 9.6–11°C). 7 of 3,685 checked values (0.2%) were excluded by quality control. Across 8 comparable years, mean wave height was above the same-month mean of 8.7 ft and mean wave period was above the same-month mean of 6.6 seconds.

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

Typical Wave Height

9.8ft
Mean: 10.4 ft
P10–P90: 6.2 — 15.4 ft
Recorded extremes

0 — 28.2 ft

Available for 734 of 737 hourly samples

Mean Wave Period

7.4secs
P10–P90: 6 — 9secs
Recorded extremes

5 — 11secs

Available for 733 of 737 hourly samples

Mean Water Temperature

10°C
P10–P90: 9.6 — 11°C
Recorded extremes

9.3 — 11.6°C

Typical Wind

SSW, 17.2mph
Mean: 17.3 mph
P10–P90: 7.6 — 27.7 mph
Recorded extremes

2.2 — 35.8 mph

Circular concentration: 47%

Compared With Previous Mays

Historical baseline from 5,754 observations across 8 years.

Wave Height
10.4ft
1.7ft above mean
Historical mean 8.7ft
Wave Period
7.4s
0.8s above mean
Historical mean 6.6s
Water Temperature
10°C
0.2°C below mean
Historical mean 10.2°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 May 2018Last observation shown
Metric
Mean wave height (ft)119111213118111823171610681099131211812118687596
Mean observed period(s)7Reported7Reported7Reported7Reported8Reported8Reported8Reported7Reported9Reported10Reported8Reported8Reported7Reported6Reported7Reported7Reported7Reported7Reported8Reported8Reported8Reported7Reported8Reported8Reported7Reported7Reported8Reported7Reported6Reported9Reported6Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionWNWconcentration 56%WSWconcentration 90%SWconcentration 98%SSWconcentration 98%WSWconcentration 75%WSWconcentration 86%Sconcentration 71%SSWconcentration 92%Sconcentration 95%SSWconcentration 90%SSEconcentration 98%SEconcentration 96%SSEconcentration 88%Sconcentration 83%WSWconcentration 89%WSWconcentration 98%Sconcentration 91%WSWconcentration 45%Sconcentration 87%WSWconcentration 94%WSWconcentration 89%SSEconcentration 98%Sconcentration 100%SSWconcentration 64%WSWconcentration 64%Econcentration 98%ESEconcentration 85%Variableconcentration 18%Econcentration 97%ENEconcentration 88%NNEconcentration 96%
Mean wind speed (mph)2019212319131523303030282391718171521161115171688111111816
Mean water temperature(°C)9.69.69.69.69.69.69.69.69.69.69.69.59.69.99.89.79.79.99.89.810.010.110.010.110.310.410.610.911.011.311.4

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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