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K5 wave buoy daily means for Sep 2021

Daily means from the K5 wave buoy for Sep 2021, 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 0 ft; wave-period data were unavailable. Typical wind was 18.3 mph (10th–90th percentile 8.1–31.1 mph) and mean water temperature was 13.9°C (10th–90th percentile 12.9–14.7°C). 1,365 of 3,591 checked values (38%) were excluded by quality control. Across 11 comparable years, mean wave height was below the same-month mean of 10.3 ft.

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

Typical Wave Height

0ft
Mean: 0 ft
P10–P90: 0 — 0 ft
Recorded extremes

0 — 0 ft

Available for 396 of 719 hourly samples

Mean Wave Period

-secs
P10–P90: - — -secs

Available for 0 of 719 hourly samples

Mean Water Temperature

13.9°C
P10–P90: 12.9 — 14.7°C
Recorded extremes

12.7 — 15.1°C

Available for 392 of 719 hourly samples

Typical Wind

SW, 18.3mph
Mean: 19.2 mph
P10–P90: 8.1 — 31.1 mph
Recorded extremes

2.2 — 42.5 mph

Circular concentration: 58%

Compared With Previous Septembers

Historical baseline from 7,768 observations across 11 years.

Wave Height
0ft
10.3ft below mean
Historical mean 10.3ft
Wave Period
–
Not enough comparable data
Historical mean 6.9s
Water Temperature
13.9°C
1.3°C above 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 2021Last observation shown
Metric
Mean wave height (ft)00000-000-000000000-000-000000
Mean observed period(s)------------------------------
Mean wave power(kW/m)------------------------------
Mean wind directionESEconcentration 64%SSWconcentration 93%Sconcentration 90%Sconcentration 91%SSWconcentration 96%SWconcentration 97%SWconcentration 100%Variableconcentration 23%NNEconcentration 96%NNEconcentration 97%NNWconcentration 87%SWconcentration 78%SSWconcentration 98%Wconcentration 82%SWconcentration 96%Sconcentration 97%WSWconcentration 87%SSWconcentration 92%SWconcentration 95%WSWconcentration 92%SWconcentration 96%Wconcentration 99%Wconcentration 81%Wconcentration 97%SSWconcentration 97%SWconcentration 96%SWconcentration 91%WSWconcentration 94%Wconcentration 48%SWconcentration 70%
Mean wind speed (mph)7111015222222181717813251012201921133034312524302017171730
Mean water temperature(°C)14.914.714.814.614.4-14.414.514.4-14.314.314.213.913.913.813.713.613.5-13.313.213.1-13.012.913.013.012.912.8

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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