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Greenwich wave buoy daily means for Aug 2010

Daily means from the Greenwich wave buoy for Aug 2010, 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

616 wave-buoy observations covered all 31 days. Typical wave height was 1.6 ft (10th–90th percentile 1–3.3 ft), while mean reported wave period; measurement type unavailable was 5.7 seconds (10th–90th percentile 5–7 seconds). Typical wind was 17.2 mph (10th–90th percentile 10.3–26.4 mph). 1 of 2,463 checked values (0%) were excluded by quality control.

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

Typical Wave Height

1.6ft
Mean: 1.8 ft
P10–P90: 1 — 3.3 ft
Recorded extremes

0.3 — 7.9 ft

Available for 615 of 616 hourly samples

Mean Wave Period

5.7secs
P10–P90: 5 — 7secs
Recorded extremes

4 — 8secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 616 hourly samples

Typical Wind

W, 17.2mph
Mean: 18.1 mph
P10–P90: 10.3 — 26.4 mph
Recorded extremes

2.2 — 45 mph

Circular concentration: 57%

Available for 615 of 616 hourly samples

Chart showing grouped wave observations for Greenwich. 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 Greenwich wave buoy

Greenwich Lightship (WMO 62305) is a UK Met Office station in the southern North Sea on the Greenwich meridian. It monitors marine conditions between the Dover Strait and the Thames approaches. The station feed can include wind, wave height, pressure, visibility, and air and sea temperature.

Metrics are rows; days run left to right.
Greenwich wave buoy daily means Aug 2010Last observation shown
Metric
Mean wave height (ft)1112212111211112222222452322321
Mean observed period(s)5Reported6Reported6Reported5Reported6Reported6Reported6Reported6Reported6Reported5Reported6Reported5Reported5Reported5Reported5Reported6Reported5Reported5Reported6Reported7Reported7Reported7Reported6Reported6Reported6Reported6Reported6Reported6Reported5Reported6Reported7Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionWSWconcentration 97%Wconcentration 96%Wconcentration 93%Wconcentration 78%WNWconcentration 88%WSWconcentration 84%WSWconcentration 93%WNWconcentration 76%SWconcentration 89%SWconcentration 96%Wconcentration 88%NWconcentration 81%NWconcentration 89%Nconcentration 83%Nconcentration 96%NWconcentration 85%Wconcentration 92%Wconcentration 88%SWconcentration 76%SSWconcentration 90%SWconcentration 98%SWconcentration 88%SWconcentration 77%WSWconcentration 97%SSWconcentration 65%SWconcentration 94%NNWconcentration 63%NWconcentration 89%WNWconcentration 92%NNWconcentration 80%ENEconcentration 94%
Mean wind speed (mph)17121519211417131219131616121823211920151714313021201817282113
Mean water temperature(°C)-------------------------------

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.

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