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K2 wave buoy daily means for Sep 2013

Daily means from the K2 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

714 wave-buoy observations covered all 30 days. Typical wave height was 7.5 ft (10th–90th percentile 4.9–12.5 ft), while mean reported wave period; measurement type unavailable was 6.6 seconds (10th–90th percentile 5–8 seconds). Typical wind was 16.1 mph (10th–90th percentile 9.2–24.2 mph) and mean water temperature was 15.1°C (10th–90th percentile 14.4–15.9°C). 1 of 2,943 checked values (0%) were excluded by quality control. Across 3 comparable years, mean wave height was below the same-month mean of 9.9 ft and mean wave period was below the same-month mean of 6.9 seconds.

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

Typical Wave Height

7.5ft
Mean: 8.3 ft
P10–P90: 4.9 — 12.5 ft
Recorded extremes

3.6 — 19.7 ft

Available for 713 of 714 hourly samples

Mean Wave Period

6.6secs
P10–P90: 5 — 8secs
Recorded extremes

5 — 10secs

Mean Water Temperature

15.1°C
P10–P90: 14.4 — 15.9°C
Recorded extremes

14.1 — 16°C

Available for 87 of 714 hourly samples

Typical Wind

Variable, 16.1mph
Mean: 16.6 mph
P10–P90: 9.2 — 24.2 mph
Recorded extremes

2.3 — 29.9 mph

Circular concentration: 21%

Compared With Previous Septembers

Historical baseline from 2,144 observations across 3 years.

Wave Height
8.3ft
1.6ft below mean
Historical mean 9.9ft
Wave Period
6.6s
0.3s below mean
Historical mean 6.9s
Water Temperature
15.1°C
0.1°C below mean
Historical mean 15.2°C

Chart showing grouped wave observations for K2. 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 K2 wave buoy

K2 (WMO 62081) is a UK Met Office buoy in the North Atlantic west of Ireland. It provides an upstream view of ocean weather and sea conditions before systems reach Ireland and the UK. The international station feed can include wind, pressure, air and sea temperature, and wave observations when the relevant sensors are reporting.

Metrics are rows; days run left to right.
K2 wave buoy daily means Sep 2013Last observation shown
Metric
Mean wave height (ft)9658797675457812171612107911128879757
Mean observed period(s)8Reported6Reported6Reported7Reported6Reported6Reported6Reported5Reported5Reported5Reported5Reported5Reported8Reported9Reported7Reported8Reported8Reported8Reported7Reported7Reported8Reported7Reported7Reported7Reported7Reported6Reported7Reported7Reported6Reported6Reported
Mean wave power(kW/m)------------------------------
Mean wind directionSWconcentration 99%SSWconcentration 98%Sconcentration 99%WSWconcentration 46%WNWconcentration 97%Nconcentration 98%NNWconcentration 90%Wconcentration 78%NNWconcentration 96%NNWconcentration 95%Wconcentration 85%Wconcentration 72%NWconcentration 71%Variableconcentration 17%Wconcentration 85%WNWconcentration 98%Wconcentration 99%WNWconcentration 79%Wconcentration 92%SSWconcentration 78%SSWconcentration 95%SSEconcentration 97%SEconcentration 97%SSEconcentration 82%ESEconcentration 96%ESEconcentration 94%ESEconcentration 97%Econcentration 99%SEconcentration 96%SEconcentration 98%
Mean wind speed (mph)1315151717221519201315155827252717181316192314151618111417
Mean water temperature(°C)15.815.314.614.5--------------------------

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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