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K5 wave buoy daily means for Sep 2020

Daily means from the K5 wave buoy for Sep 2020, 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

719 wave-buoy observations covered all 30 days. Typical wave height was 9.8 ft (10th–90th percentile 6.9–14.8 ft), while mean reported wave period; measurement type unavailable was 7.2 seconds (10th–90th percentile 6–8 seconds). Typical wind was 18.3 mph (10th–90th percentile 6.9–28.9 mph) and mean water temperature was 12.5°C (10th–90th percentile 12.3–12.9°C). 5 of 3,595 checked values (0.1%) were excluded by quality control. Across 10 comparable years, mean wave height was above the same-month mean of 10.3 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: 10.4 ft
P10–P90: 6.9 — 14.8 ft
Recorded extremes

3.9 — 22 ft

Available for 715 of 719 hourly samples

Mean Wave Period

7.2secs
P10–P90: 6 — 8secs
Recorded extremes

4 — 10secs

Mean Water Temperature

12.5°C
P10–P90: 12.3 — 12.9°C
Recorded extremes

12.1 — 13°C

Typical Wind

WSW, 18.3mph
Mean: 18 mph
P10–P90: 6.9 — 28.9 mph
Recorded extremes

0 — 38 mph

Circular concentration: 42%

Available for 718 of 719 hourly samples

Compared With Previous Septembers

Historical baseline from 7,049 observations across 10 years.

Wave Height
10.4ft
0.1ft above mean
Historical mean 10.3ft
Wave Period
7.2s
0.3s above mean
Historical mean 6.9s
Water Temperature
12.5°C
0.1°C below mean
Historical mean 12.6°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 Sep 2020Last observation shown
Metric
Mean wave height (ft)910141612910111212151910965787121210881210129912
Mean observed period(s)6Reported7Reported7Reported8Reported7Reported7Reported6Reported7Reported7Reported7Reported8Reported9Reported8Reported8Reported7Reported6Reported6Reported8Reported8Reported8Reported8Reported8Reported7Reported7Reported8Reported8Reported7Reported7Reported6Reported7Reported
Mean wave power(kW/m)------------------------------
Mean wind directionSconcentration 97%SSWconcentration 95%WSWconcentration 81%Wconcentration 98%WNWconcentration 98%SWconcentration 74%WSWconcentration 97%WSWconcentration 99%Wconcentration 97%SWconcentration 98%WSWconcentration 94%WSWconcentration 100%NEconcentration 45%Econcentration 75%Nconcentration 86%ESEconcentration 74%SSWconcentration 96%Variableconcentration 8%SWconcentration 84%SWconcentration 96%Wconcentration 72%NNWconcentration 83%WSWconcentration 58%Nconcentration 96%Nconcentration 98%SEconcentration 56%Sconcentration 89%WSWconcentration 91%Sconcentration 87%WSWconcentration 51%
Mean wind speed (mph)211926281616232321242826861013196122218131319151225152222
Mean water temperature(°C)12.912.812.812.812.712.812.812.712.612.512.312.412.212.212.312.312.312.412.412.412.412.612.712.612.612.512.512.412.412.4

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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