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K5 wave buoy daily means for Sep 2013

Daily means from the K5 wave buoy for Sep 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

717 wave-buoy observations covered all 30 days. Typical wave height was 8.2 ft (10th–90th percentile 4.9–15.4 ft), while mean reported wave period; measurement type unavailable was 6.7 seconds (10th–90th percentile 5–8 seconds). Typical wind was 16.1 mph (10th–90th percentile 6.9–27.7 mph) and mean water temperature was 12.3°C (10th–90th percentile 11.7–13°C). All 3,585 checked values passed quality control. Across 3 comparable years, mean wave height was below the same-month mean of 11.2 ft and mean wave period was below the same-month mean of 7 seconds.

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

Typical Wave Height

8.2ft
Mean: 9.7 ft
P10–P90: 4.9 — 15.4 ft
Recorded extremes

3.3 — 32.5 ft

Mean Wave Period

6.7secs
P10–P90: 5 — 8secs
Recorded extremes

4 — 11secs

Mean Water Temperature

12.3°C
P10–P90: 11.7 — 13°C
Recorded extremes

11.6 — 13.1°C

Typical Wind

Variable, 16.1mph
Mean: 16.8 mph
P10–P90: 6.9 — 27.7 mph
Recorded extremes

2.2 — 38 mph

Circular concentration: 26%

Compared With Previous Septembers

Historical baseline from 2,121 observations across 3 years.

Wave Height
9.7ft
1.5ft below mean
Historical mean 11.2ft
Wave Period
6.7s
0.3s below mean
Historical mean 7s
Water Temperature
12.3°C
0.2°C below mean
Historical mean 12.5°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 2013Last observation shown
Metric
Mean wave height (ft)1612119775565710131218QC rejected1513891410108765466
Mean observed period(s)8Reported7Reported8Reported7Reported6Reported7Reported6Reported6Reported6Reported5Reported5Reported6Reported8Reported7Reported8Reported10Reported8Reported8Reported7Reported6Reported8Reported7Reported8Reported7Reported5Reported5Reported5Reported6Reported5Reported5Reported
Mean wave power(kW/m)------------------------------
Mean wind directionWSWconcentration 99%Wconcentration 98%Variableconcentration 6%Nconcentration 49%WNWconcentration 74%NNWconcentration 90%NNEconcentration 95%Variableconcentration 12%WNWconcentration 80%WSWconcentration 90%Wconcentration 87%WSWconcentration 87%WSWconcentration 98%SWconcentration 91%Wconcentration 91%NWconcentration 98%NWconcentration 96%WNWconcentration 92%SWconcentration 58%SWconcentration 96%SWconcentration 38%SSWconcentration 63%SSEconcentration 82%ENEconcentration 99%ENEconcentration 98%SEconcentration 82%SSWconcentration 53%NNEconcentration 48%Econcentration 98%SEconcentration 99%
Mean wind speed (mph)282110101513116131616211923323418209222016101417159111717
Mean water temperature(°C)12.912.912.912.912.612.612.612.812.813.013.013.012.912.812.512.212.012.011.711.611.711.712.012.011.911.811.811.811.811.8

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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